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Android Realtime
Libraries
Fumihiko Shiroyama
https://speakerdeck.com/srym/android-realtime-library
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About Me
• Fumihiko Shiroyama
• Android App Developer
• Nikkei Inc.
• https://github.com/srym
• https://twitter.com/fushiroyama
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Realtime Apps
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https://github.com/srym/FirebaseRealTimeChat
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https://realm.io/news/introducing-realm-mobile-platform/
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Realtime Apps' Upsides
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Realtime Apps' Upsides
• Enables Rich User Interaction
• Server Side Message Pushing
• No Pull-To-Refresh
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Realtime Apps' Downsides
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Realtime Apps' Downsides
• Connection Problems
• Dealing with Poor Signal
• Hassle with Retransmission
• Complex Infrastructure
• Proxy Problems etc, etc...
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Realtime Libraries
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Realtime Libraries
• WebSocket
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Realtime Libraries
• WebSocket
• Firebase Realtime Database
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Realtime Libraries
• WebSocket
• Firebase Realtime Database
• Realm Mobile Platform
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WebSocket
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WebSocket
8FC4PDLFU
4FSWFS
8FC4PDLFU
$MJFOU
8FC4PDLFU
$MJFOU
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WebSocket
4FOE.FTTBHF
8FC4PDLFU
$MJFOU
8FC4PDLFU
4FSWFS
8FC4PDLFU
$MJFOU
send "hello"
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WebSocket
4FOE.FTTBHF
1SPDFTT
%BUB
8FC4PDLFU
$MJFOU
8FC4PDLFU
4FSWFS
8FC4PDLFU
$MJFOU
send "hello"
send "hello"
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WebSocket
4FOE.FTTBHF
1SPDFTT
%BUB
4FOE.FTTBHF
4FOE.FTTBHF
8FC4PDLFU
$MJFOU
8FC4PDLFU
4FSWFS
8FC4PDLFU
$MJFOU
send "hello"
send "hello"
"hello" is sent
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WebSocket
• https://tools.ietf.org/html/rfc6455
• HTTP Upgrade
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WebSocket
GET /chat HTTP/1.1
Host: server.example.com
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
Origin: http://example.com
Sec-WebSocket-Protocol: chat, superchat
Sec-WebSocket-Version: 13
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WebSocket
GET /chat HTTP/1.1
Host: server.example.com
Upgrade: websocket
Connection: Upgrade
Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
Origin: http://example.com
Sec-WebSocket-Protocol: chat, superchat
Sec-WebSocket-Version: 13
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WebSocket
• https://tools.ietf.org/html/rfc6455
• HTTP Upgrade
• Light-Weight & Efficient
• Minimum 2KB Header + Payload
• Keeping Connection
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OkHttp Supports WebSocket
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Try it!
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WebSocket Server
• https://github.com/theturtle32/WebSocket-Node
• $ npm install websocket
• https://github.com/theturtle32/WebSocket-
Node#server-example
• $ node server-example.js
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WebSocket Server
• https://github.com/theturtle32/WebSocket-Node
• $ npm install websocket
• https://github.com/theturtle32/WebSocket-
Node#server-example
• $ node server-example.js
8IBUFWFS
ZPVMJLF
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build.gradle
dependencies {
compile 'com.squareup.okhttp3:okhttp:3.6.0'
}
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WebSocketListener
WebSocketListener listener = new WebSocketListener() {
@Override
public void onOpen(WebSocket ws, Response res) {}
@Override
public void onClosing(WebSocket ws, int code, String reason) {}
@Override
public void onClosed(WebSocket ws, int code, String reason) {}
@Override
public void onFailure(WebSocket ws, Throwable t, Response res) {}
@Override
public void onMessage(WebSocket ws, final String text) {}
@Override
public void onMessage(WebSocket ws, ByteString bytes) {}
};
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WebSocketListener
WebSocketListener listener = new WebSocketListener() {
@Override
public void onOpen(WebSocket ws, Response res) {}
@Override
public void onClosing(WebSocket ws, int code, String reason) {}
@Override
public void onClosed(WebSocket ws, int code, String reason) {}
@Override
public void onFailure(WebSocket ws, Throwable t, Response res) {}
@Override
public void onMessage(WebSocket ws, final String text) {}
@Override
public void onMessage(WebSocket ws, ByteString bytes) {}
};
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WebSocketListener
@Override
public void onMessage(WebSocket ws, final String text) {
Log.d(TAG, "onMessage(text): " + text);
}
@Override
public void onMessage(WebSocket ws, ByteString bytes) {
Log.d(TAG, "onMessage(binary)");
}
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WebSocketListener
@Override
public void onMessage(WebSocket ws, final String text) {
Log.d(TAG, "onMessage(text): " + text);
}
@Override
public void onMessage(WebSocket ws, ByteString bytes) {
Log.d(TAG, "onMessage(binary)");
}
5FYU
#JOBSZ
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OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("ws://example.com:8080")
.build();
final WebSocket webSocket
= client.newWebSocket(request, listener);
// Trigger shutdown of the dispatcher's executor
// so this process can exit cleanly.
client.dispatcher().executorService().shutdown();
WebSocket
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OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("ws://example.com:8080")
.build();
final WebSocket webSocket
= client.newWebSocket(request, listener);
// Trigger shutdown of the dispatcher's executor
// so this process can exit cleanly.
client.dispatcher().executorService().shutdown();
WebSocket
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OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("ws://example.com:8080")
.build();
final WebSocket webSocket
= client.newWebSocket(request, listener);
// Trigger shutdown of the dispatcher's executor
// so this process can exit cleanly.
client.dispatcher().executorService().shutdown();
WebSocket
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WebSocket
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("ws://example.com:8080")
.build();
final WebSocket webSocket
= client.newWebSocket(request, listener);
// Trigger shutdown of the dispatcher's executor
// so this process can exit cleanly.
client.dispatcher().executorService().shutdown();
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send
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
webSocket.send("message");
}
});
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send
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
webSocket.send("message");
}
});
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send
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
webSocket.send("message");
}
});
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send JSON
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Message
public class Message {
@SerializedName("sender_id")
public final long senderId;
@SerializedName("message")
public final String message;
public Message(long senderId, String message) {
this.senderId = senderId;
this.message = message;
}
}
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send JSON
dependencies {
compile 'com.squareup.okhttp3:okhttp:3.6.0'
compile 'com.google.code.gson:gson:2.8.0'
}
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send JSON
dependencies {
compile 'com.squareup.okhttp3:okhttp:3.6.0'
compile 'com.google.code.gson:gson:2.8.0'
}
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send JSON
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message(1234, "hi there!");
webSocket.send(gson.toJson(message));
}
});
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send JSON
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message(1234, "hi there!");
webSocket.send(gson.toJson(message));
}
});
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send JSON
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message(1234, "hi there!");
webSocket.send(gson.toJson(message));
}
});
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receive Message
@Override
public void onMessage(WebSocket ws, final String text) {
Message message = gson.fromJson(text, Message.class);
Log.d(TAG, "onMessage(text): " + message.toString());
}
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receive Message
@Override
public void onMessage(WebSocket ws, final String text) {
Message message = gson.fromJson(text, Message.class);
Log.d(TAG, "onMessage(text): " + message.toString());
}
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WebSocket Tips
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WebSocket Tips
• WebSocket does NOT have any room, namespace
mechanism.
• WebSocket does NOT support broadcasting out of the
box.
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WebSocket Tips
• WebSocket does NOT have any room, namespace
mechanism.
• WebSocket does NOT support broadcasting out of the
box.
4PNF
*NQMFNFOUBUJPOTEP
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WebSocket Server
wsServer.on('request', function(request) {
var connection = request.accept();
connection.on('message', function(message) {
if (message.type === 'utf8') {
wsServer.broadcastUTF(message.utf8Data);
}
else if (message.type === 'binary') {
wsServer.broadcastBytes(message.binaryData);
}
});
}
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WebSocket Server
wsServer.on('request', function(request) {
var connection = request.accept();
connection.on('message', function(message) {
if (message.type === 'utf8') {
wsServer.broadcastUTF(message.utf8Data);
}
else if (message.type === 'binary') {
wsServer.broadcastBytes(message.binaryData);
}
});
}
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WebSocket Server
wsServer.on('request', function(request) {
var connection = request.accept();
connection.on('message', function(message) {
if (message.type === 'utf8') {
wsServer.broadcastUTF(message.utf8Data);
}
else if (message.type === 'binary') {
wsServer.broadcastBytes(message.binaryData);
}
});
}
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WebSocket Server
wsServer.on('request', function(request) {
var connection = request.accept();
connection.on('message', function(message) {
if (message.type === 'utf8') {
wsServer.broadcastUTF(message.utf8Data);
}
else if (message.type === 'binary') {
wsServer.broadcastBytes(message.binaryData);
}
});
}
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WebSocket Tips
• WebSocket does NOT have any room, namespace
mechanism.
• WebSocket does NOT support broadcasting out of the
box.
• You can use socket.io for room, namespace, connection
retry, fallbacks etc...
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Summary
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Good Points
• Simple and Open and Free
• Server Hook Point
• Binary Support
• Can Scale
• Redis Pub/Sub
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Bad Points
• No Offline Support
• No rooms / namespaces
• No Broadcasting
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Firebase Realtime Database
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Realtime Database
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-PDBM
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-PDBM
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Realtime Database
3FNPUF
%BUBCBTF
-PDBM
%BUBCBTF
-PDBM
%BUBCBTF
%BUB
8SJUUFO
$BMMCBDL
send "hello"
"hello" written!
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Realtime Database
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%BUBCBTF
-PDBM
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-PDBM
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%BUB
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4ZOD
$BMMCBDL
send "hello"
"hello" written!
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Realtime Database
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%BUBCBTF
-PDBM
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-PDBM
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%BUB
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4ZOD
4ZOD
4ZOD
$BMMCBDL
$BMMCBDL
send "hello"
"hello" written!
"hello" written!
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Realtime Database
• by Google
• Every client looks at Local Database
• Offline Support!
• Data are synced transparently
• Handy and robust Security Rule
• Don't worry about scaling
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Data Structure
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Data Structure
• No SQL
• JSON Tree
• No "Columns" or "Relations"
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Data Structure
{
"messages": {
"one": {
"m1": {
"name": "eclarke",
"message": "The relay seems to be malfunctioning.",
"timestamp": 1459361875337
},
"m2": { ... },
"m3": { ... }
},
"two": { ... },
"three": { ... }
}
}
.FTTBHF
5SFF
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Data Structure
{
"messages": {
"one": {
"m1": {
"name": "eclarke",
"message": "The relay seems to be malfunctioning.",
"timestamp": 1459361875337
},
"m2": { ... },
"m3": { ... }
},
"two": { ... },
"three": { ... }
}
}
$IBUSPPN
POF
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Data Structure
{
"messages": {
"one": {
"m1": {
"name": "shiroyama",
"message": "Hello Everyone!",
"timestamp": 1459361875337
},
"m2": { ... },
"m3": { ... }
},
"two": { ... },
"three": { ... }
}
}
Hello Everyone!
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Data Structure
{
"messages": {
"one": {
"m1": {
"name": "shiroyama",
"message": "Hello Everyone!",
"timestamp": 1459361875337
},
"m2": { ... },
"m3": { ... }
},
"two": { ... },
"three": { ... }
}
}
Hello Everyone!
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Data Structure
{
"chats": {
"one": {
"title": "Room 1",
"lastMessage": "shiroyama: Hello Everyone!",
"timestamp": 1459361875666
},
"two": { ... }, "three": { ... }
},
"members": {
"one": {
"shiroyama": true,
"tanaka": true
},
"two": { ... }, "three": { ... }
},
"messages": {
"one": {
"m1": {
"name": "shiroyama",
"message": "Hello Everyone!",
"timestamp": 1459361875337
},
"m2": { ... }, "m3": { ... }
}
}
}
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Data Structure
{
"chats": {
"one": {
"title": "Room 1",
"lastMessage": "shiroyama: Hello Everyone!",
"timestamp": 1459361875666
},
"two": { ... }, "three": { ... }
},
"members": {
"one": {
"shiroyama": true,
"tanaka": true
},
"two": { ... }, "three": { ... }
},
"messages": {
"one": {
"m1": {
"name": "shiroyama",
"message": "Hello Everyone!",
"timestamp": 1459361875337
},
"m2": { ... }, "m3": { ... }
}
}
}
EFOPSNBMJ[JOH
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Data Structure
{
"chats": {
"one": {
"title": "Room 1",
"lastMessage": "shiroyama: Hello Everyone!",
"timestamp": 1459361875666
},
"two": { ... }, "three": { ... }
},
"members": {
"one": {
"shiroyama": true,
"tanaka": true
},
"two": { ... }, "three": { ... }
},
"messages": {
"one": {
"m1": {
"name": "shiroyama",
"message": "Hello Everyone!",
"timestamp": 1459361875337
},
"m2": { ... }, "m3": { ... }
}
}
}
EFOPSNBMJ[JOH
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Security Rules
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Security Rules
{
"rules": {
"messages": {
".read": true,
".write": "auth != null"
}
}
}
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Security Rules
{
"rules": {
"messages": {
".read": true,
".write": "auth != null"
}
}
}
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Security Rules
{
"rules": {
"messages": {
".read": true,
".write": "auth != null"
}
}
}
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Security Rules
{
"rules": {
"messages": {
".read": true,
".write": "auth != null"
}
}
}
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• https://firebase.google.com/docs/database/security/
• .read, .write, .validate
• Predefined Variables
• https://firebase.google.com/docs/database/security/
securing-data?hl=en#predefined_variables
Security Rules
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Client Side
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Install Firebase Plugin
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Connect Realtime Database
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Add Realtime Database
https://firebase.google.com/docs/database/android/start/
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google-services.json
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Firebase Console
https://console.firebase.google.com/
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Database Reference
FirebaseDatabase database
= FirebaseDatabase.getInstance();
DatabaseReference messages
= database.getReference("messages");
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Database Reference
FirebaseDatabase database
= FirebaseDatabase.getInstance();
DatabaseReference messages
= database.getReference("messages");
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Database Reference
FirebaseDatabase database
= FirebaseDatabase.getInstance();
DatabaseReference messages
= database.getReference("messages");
NFTTBHFT
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Message
@IgnoreExtraProperties
public class Message {
private String name;
private String message;
private long timestamp;
public Message() {
}
// getters and setters
}
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Send Message
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
messages.push().setValue(message);
}
});
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Send Message
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
messages.push().setValue(message);
}
});
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Send Message
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
messages.push().setValue(message);
}
});
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Send Message
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
messages.push().setValue(message);
}
});
QVTIUPMJTU
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{
"messages": {
"one": {
"-Kei_CdbvKoms35KcA8p": {
"name": "shiroyama",
"message": "Hello Everyone!",
"timestamp": 1459361875337
},
"m2": { ... },
"m3": { ... }
},
"two": { ... },
"three": { ... }
}
}
Hello Everyone!
Send Message
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{
"messages": {
"one": {
"-Kei_CdbvKoms35KcA8p": {
"name": "shiroyama",
"message": "Hello Everyone!",
"timestamp": 1459361875337
},
"m2": { ... },
"m3": { ... }
},
"two": { ... },
"three": { ... }
}
}
Hello Everyone!
HFOFSBUFECZ
QVTI
Send Message
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Send Message
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
messages.push().setValue(message);
}
});
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Send Message
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
messages.push().setValue(message);
}
});
XSJUF
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Send Message
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ChildEventListener listener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot snap, String s) {}
@Override
public void onChildChanged(DataSnapshot snap, String s) {}
@Override
public void onChildRemoved(DataSnapshot snap) {}
@Override
public void onChildMoved(DataSnapshot snap, String s) {}
@Override
public void onCancelled(DatabaseError error) {}
};
messages.addChildEventListener(listener);
Receive Message
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ChildEventListener listener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot snap, String s) {}
@Override
public void onChildChanged(DataSnapshot snap, String s) {}
@Override
public void onChildRemoved(DataSnapshot snap) {}
@Override
public void onChildMoved(DataSnapshot snap, String s) {}
@Override
public void onCancelled(DatabaseError error) {}
};
messages.addChildEventListener(listener);
Receive Message
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ChildEventListener listener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot snap, String s) {}
@Override
public void onChildChanged(DataSnapshot snap, String s) {}
@Override
public void onChildRemoved(DataSnapshot snap) {}
@Override
public void onChildMoved(DataSnapshot snap, String s) {}
@Override
public void onCancelled(DatabaseError error) {}
};
messages.addChildEventListener(listener);
Receive Message
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ChildEventListener listener = new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot snap, String s) {}
@Override
public void onChildChanged(DataSnapshot snap, String s) {}
@Override
public void onChildRemoved(DataSnapshot snap) {}
@Override
public void onChildMoved(DataSnapshot snap, String s) {}
@Override
public void onCancelled(DatabaseError error) {}
};
messages.addChildEventListener(listener);
Receive Message
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onChildAdded()
@Override
public void onChildAdded(DataSnapshot snap, String s) {
Message message = snap.getValue(Message.class);
Log.d(TAG, message.getMessage());
}
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onChildAdded()
@Override
public void onChildAdded(DataSnapshot snap, String s) {
Message message = snap.getValue(Message.class);
Log.d(TAG, message.getMessage());
}
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onChildAdded()
@Override
public void onChildAdded(DataSnapshot snap, String s) {
Message message = snap.getValue(Message.class);
Log.d(TAG, message.getMessage());
}
5ZQF4BGF
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onChildAdded()
D/Message: Hello Everyone!
D/Message: How are you today?
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Sort and Filter
messages.orderByChild("timestamp")
.limitToFirst(50);
messages.addChildEventListener(listener);
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Sort and Filter
messages.orderByChild("timestamp")
.limitToFirst(50);
messages.addChildEventListener(listener);
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Sort and Filter
messages.orderByChild("timestamp")
.limitToFirst(50);
messages.addChildEventListener(listener);
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Remove Listener
@Override
protected void onPause() {
messages.removeEventListener(listener);
super.onPause();
}
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Remove Listener
@Override
protected void onPause() {
messages.removeEventListener(listener);
super.onPause();
}
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• ValueEventListener
• Fetch single item / at once
• ChildEventListener
• Fetch from list (add/change/remove/move)
• https://firebase.google.com/docs/database/android/
read-and-write
Listeners
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• Pull-to-Refresh
• ValueEvent is triggered at last
• Desc Ordering
• setPrioritiy(timestamp * -1)
• or create "desc_timestamp" property
Realtime Database Tips
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• srym/FirebaseRealTimeChat
• https://github.com/srym/FirebaseRealTimeChat
• Realtime Database
• Cloud Storage
• Remote Config
Realtime Database Sample
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Summary
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Good Points
• Offline Support and Sync
• Easy and Robust Security Rules
• Good Interaction with other Firebase services
• Easy to scale
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Bad Points
• No binary support
• No server hook point
• No source code!
• Tricky ordering limitation
• Storage and Traffic fee could be expensive
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Realm Mobile Platform
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• Alternative to SQLite and Core Data
• ORMapper
• Cross Platform
• https://realm.io/products/realm-mobile-database/
Realm Mobile Database
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Try it!
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Project's build.gradle
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.3'
classpath 'io.realm:realm-gradle-plugin:3.0.0'
}
}
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Project's build.gradle
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.3'
classpath 'io.realm:realm-gradle-plugin:3.0.0'
}
}
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App's build.gradle
apply plugin: 'com.android.application'
apply plugin: 'realm-android'
android {
}
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App's build.gradle
apply plugin: 'com.android.application'
apply plugin: 'realm-android'
android {
}
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Custom Application
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Realm.init(this);
RealmLog.setLevel(Log.VERBOSE);
}
}
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Custom Application
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Realm.init(this);
RealmLog.setLevel(Log.VERBOSE);
}
}
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Custom Application
public class MyApplication extends Application {
@Override
public void onCreate() {
super.onCreate();
Realm.init(this);
RealmLog.setLevel(Log.VERBOSE);
}
}
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Message Model
public class Message extends RealmObject {
private String name;
private String message;
private long timestamp;
public Message() {
}
// getters & setters
}
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Message Model
public class Message extends RealmObject {
private String name;
private String message;
private long timestamp;
public Message() {
}
// getters & setters
}
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Message Model
public class Message extends RealmObject {
private String name;
private String message;
private long timestamp;
public Message() {
}
// getters & setters
}
OFDFTTBSZ
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Message Model
public class Message extends RealmObject {
private String name;
private String message;
private long timestamp;
public Message() {
}
// getters & setters
}
OFDFTTBSZ
QSPYZUP
OBUJWFDPEF
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Write to Realm
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
final Message message = realm.createObject(Message.class);
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
}
});
}
});
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Write to Realm
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
final Message message = realm.createObject(Message.class);
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
}
});
}
});
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Write to Realm
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
final Message message = realm.createObject(Message.class);
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
}
});
}
});
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Write to Realm
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
final Message message = realm.createObject(Message.class);
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
}
});
}
});
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Write to Realm
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
final Message message = realm.createObject(Message.class);
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
}
});
}
});
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Write to Realm
final Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
realm.copyToRealm(message);
}
});
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or
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Write to Realm
final Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
realm.copyToRealm(message);
}
});
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Write to Realm
final Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
realm.copyToRealm(message);
}
});
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Write to Realm
final Message message = new Message();
message.setName(name);
message.setMessage(text);
message.setTimestamp(timestamp);
Realm realm = Realm.getDefaultInstance();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
realm.copyToRealm(message);
}
});
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• Realm#executeTransaction
• Realm#executeTransactionAsync
Write to Realm
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Read from Realm
Realm realm = Realm.getDefaultInstance();
RealmResults messages = realm
.where(Message.class)
.findAll();
if (!messages.isEmpty()) {
for (Message message : messages) {
Log.d(TAG, "message: " + message.getMessage());
}
}
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Read from Realm
Realm realm = Realm.getDefaultInstance();
RealmResults messages = realm
.where(Message.class)
.findAll();
if (!messages.isEmpty()) {
for (Message message : messages) {
Log.d(TAG, "message: " + message.getMessage());
}
}
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Read from Realm
Realm realm = Realm.getDefaultInstance();
RealmResults messages = realm
.where(Message.class)
.findAll();
if (!messages.isEmpty()) {
for (Message message : messages) {
Log.d(TAG, "message: " + message.getMessage());
}
}
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Read from Realm
Realm realm = Realm.getDefaultInstance();
RealmResults messages = realm
.where(Message.class)
.findAll();
if (!messages.isEmpty()) {
for (Message message : messages) {
Log.d(TAG, "message: " + message.getMessage());
}
}
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Read from Realm
Realm realm = Realm.getDefaultInstance();
RealmResults messages = realm
.where(Message.class)
.findAll();
if (!messages.isEmpty()) {
for (Message message : messages) {
Log.d(TAG, "message: " + message.getMessage());
}
}
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Change Listener
RealmChangeListener> changListener
= new RealmChangeListener>() {
@Override
public void onChange(RealmResults element) {
for (Message msg : element) {
Log.d(TAG, "message: " + msg.getMessage());
}
}
};
messages.addChangeListener(changListener);
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Change Listener
RealmChangeListener> changListener
= new RealmChangeListener>() {
@Override
public void onChange(RealmResults element) {
for (Message msg : element) {
Log.d(TAG, "message: " + msg.getMessage());
}
}
};
messages.addChangeListener(changListener);
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Change Listener
RealmChangeListener> changListener
= new RealmChangeListener>() {
@Override
public void onChange(RealmResults element) {
for (Message msg : element) {
Log.d(TAG, "message: " + msg.getMessage());
}
}
};
messages.addChangeListener(changListener);
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Realm Browser
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Realm Mobile Platform
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Realm Mobile Platform
Image from
https://realm.io/news/introducing-realm-mobile-platform/
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• Offline Support
• Realtime Sync
• Authentication
• Access Control
Realm Mobile Platform
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3FBMN
.PCJMF
%BUBCBTF
3FBMN
.PCJMF
%BUBCBTF
Realm Mobile Platform
3FBMN
0CKFDU
4FSWFS
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3FBMN
0CKFDU
4FSWFS
%BUB
8SJUUFO
$BMMCBDL
send "hello"
"hello" written!
Realm Mobile Platform
3FBMN
.PCJMF
%BUBCBTF
3FBMN
.PCJMF
%BUBCBTF
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%BUB
8SJUUFO
4ZOD
$BMMCBDL
send "hello"
"hello" written!
Realm Mobile Platform
3FBMN
0CKFDU
4FSWFS
3FBMN
.PCJMF
%BUBCBTF
3FBMN
.PCJMF
%BUBCBTF
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%BUB
8SJUUFO
4ZOD
4ZOD
4ZOD
$BMMCBDL
$BMMCBDL
send "hello"
"hello" written!
"hello" written!
Realm Mobile Platform
3FBMN
0CKFDU
4FSWFS
3FBMN
.PCJMF
%BUBCBTF
3FBMN
.PCJMF
%BUBCBTF
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Realm Object Server
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• https://realm.io/docs/realm-object-server/
• macOS
• RHEL/CentOS 6
• Ubuntu 16.04
• AWS/AMI
• Developer Edition is FREE
Realm Object Server
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• Ubuntu 16.04
• curl -s https://packagecloud.io/install/repositories/realm/realm/
script.deb.sh | sudo bash
• sudo apt-get update
• sudo apt-get install realm-object-server-developer
• sudo systemctl enable realm-object-server
• sudo systemctl start realm-object-server
Realm Object Server
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• http://:9080/#!/setup
Realm Object Server
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Realm Browser
cat /etc/realm/admin_token.base64
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Client Side Modification
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App's build.gradle
apply plugin: 'com.android.application'
apply plugin: 'realm-android'
android {
}
realm {
syncEnabled = true
}
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App's build.gradle
apply plugin: 'com.android.application'
apply plugin: 'realm-android'
android {
}
realm {
syncEnabled = true
}
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Login
final SyncCredentials cred
= SyncCredentials.usernamePassword(ID, PASSWORD, true);
SyncUser.loginAsync(cred, AUTH_URL, new SyncUser.Callback() {
@Override
public void onSuccess(SyncUser user) {
final SyncConfiguration syncConfiguration
= new SyncConfiguration.Builder(user, REALM_URL).build();
Realm.setDefaultConfiguration(syncConfiguration);
realm = Realm.getDefaultInstance();
}
@Override
public void onError(ObjectServerError error) {}
});
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Login
final SyncCredentials cred
= SyncCredentials.usernamePassword(ID, PASSWORD, true);
SyncUser.loginAsync(cred, AUTH_URL, new SyncUser.Callback() {
@Override
public void onSuccess(SyncUser user) {
final SyncConfiguration syncConfiguration
= new SyncConfiguration.Builder(user, REALM_URL).build();
Realm.setDefaultConfiguration(syncConfiguration);
realm = Realm.getDefaultInstance();
}
@Override
public void onError(ObjectServerError error) {}
});
$SFBUF6TFS
'JSTU5JNF
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Login
final SyncCredentials cred
= SyncCredentials.usernamePassword(ID, PASSWORD, true);
SyncUser.loginAsync(cred, AUTH_URL, new SyncUser.Callback() {
@Override
public void onSuccess(SyncUser user) {
final SyncConfiguration syncConfiguration
= new SyncConfiguration.Builder(user, REALM_URL).build();
Realm.setDefaultConfiguration(syncConfiguration);
realm = Realm.getDefaultInstance();
}
@Override
public void onError(ObjectServerError error) {}
});
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Login
final SyncCredentials cred
= SyncCredentials.usernamePassword(ID, PASSWORD, true);
SyncUser.loginAsync(cred, AUTH_URL, new SyncUser.Callback() {
@Override
public void onSuccess(SyncUser user) {
final SyncConfiguration syncConfiguration
= new SyncConfiguration.Builder(user, REALM_URL).build();
Realm.setDefaultConfiguration(syncConfiguration);
realm = Realm.getDefaultInstance();
}
@Override
public void onError(ObjectServerError error) {}
});
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Login
final SyncCredentials cred
= SyncCredentials.usernamePassword(ID, PASSWORD, true);
SyncUser.loginAsync(cred, AUTH_URL, new SyncUser.Callback() {
@Override
public void onSuccess(SyncUser user) {
final SyncConfiguration syncConfiguration
= new SyncConfiguration.Builder(user, REALM_URL).build();
Realm.setDefaultConfiguration(syncConfiguration);
realm = Realm.getDefaultInstance();
}
@Override
public void onError(ObjectServerError error) {}
});
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Login
final SyncCredentials cred
= SyncCredentials.usernamePassword(ID, PASSWORD, true);
SyncUser.loginAsync(cred, AUTH_URL, new SyncUser.Callback() {
@Override
public void onSuccess(SyncUser user) {
final SyncConfiguration syncConfiguration
= new SyncConfiguration.Builder(user, REALM_URL).build();
Realm.setDefaultConfiguration(syncConfiguration);
realm = Realm.getDefaultInstance();
}
@Override
public void onError(ObjectServerError error) {}
});
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Login
final SyncCredentials cred
= SyncCredentials.usernamePassword(ID, PASSWORD, true);
SyncUser.loginAsync(cred, AUTH_URL, new SyncUser.Callback() {
@Override
public void onSuccess(SyncUser user) {
final SyncConfiguration syncConfiguration
= new SyncConfiguration.Builder(user, REALM_URL).build();
Realm.setDefaultConfiguration(syncConfiguration);
realm = Realm.getDefaultInstance();
}
@Override
public void onError(ObjectServerError error) {}
});
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That's all!
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Fine-grained Collection
Notification
OrderedRealmCollectionChangeListener> listener
= new OrderedRealmCollectionChangeListener>() {
@Override
public void onChange(RealmResults collection,
OrderedCollectionChangeSet changeSet) {
}
};
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Fine-grained Collection
Notification
OrderedRealmCollectionChangeListener> listener
= new OrderedRealmCollectionChangeListener>() {
@Override
public void onChange(RealmResults collection,
OrderedCollectionChangeSet changeSet) {
}
};
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Fine-grained Collection
Notification
OrderedRealmCollectionChangeListener> listener
= new OrderedRealmCollectionChangeListener>() {
@Override
public void onChange(RealmResults collection,
OrderedCollectionChangeSet changeSet) {
}
};
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Fine-grained Collection
Notification
public void onChange(RealmResults collection,
OrderedCollectionChangeSet changeSet) {
OrderedCollectionChangeSet.Range[] insertions
= changeSet.getInsertionRanges();
for (OrderedCollectionChangeSet.Range insertion : insertions) {
int index = insertion.startIndex;
int length = insertion.length;
for (int i = index; i < index + length; i++) {
Message message = collection.get(i);
Log.d(TAG, "message: " + message.getMessage());
}
}
}
messages.addChangeListener(realmChangeListener);
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Fine-grained Collection
Notification
public void onChange(RealmResults collection,
OrderedCollectionChangeSet changeSet) {
OrderedCollectionChangeSet.Range[] insertions
= changeSet.getInsertionRanges();
for (OrderedCollectionChangeSet.Range insertion : insertions) {
int index = insertion.startIndex;
int length = insertion.length;
for (int i = index; i < index + length; i++) {
Message message = collection.get(i);
Log.d(TAG, "message: " + message.getMessage());
}
}
}
messages.addChangeListener(realmChangeListener);
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Fine-grained Collection
Notification
public void onChange(RealmResults collection,
OrderedCollectionChangeSet changeSet) {
OrderedCollectionChangeSet.Range[] insertions
= changeSet.getInsertionRanges();
for (OrderedCollectionChangeSet.Range insertion : insertions) {
int index = insertion.startIndex;
int length = insertion.length;
for (int i = index; i < index + length; i++) {
Message message = collection.get(i);
Log.d(TAG, "message: " + message.getMessage());
}
}
}
messages.addChangeListener(realmChangeListener);
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Fine-grained Collection
Notification
public void onChange(RealmResults collection,
OrderedCollectionChangeSet changeSet) {
OrderedCollectionChangeSet.Range[] insertions
= changeSet.getInsertionRanges();
for (OrderedCollectionChangeSet.Range insertion : insertions) {
int index = insertion.startIndex;
int length = insertion.length;
for (int i = index; i < index + length; i++) {
Message message = collection.get(i);
Log.d(TAG, "message: " + message.getMessage());
}
}
}
messages.addChangeListener(realmChangeListener);
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Fine-grained Collection
Notification
• https://realm.io/news/realm-java-3-0-collection-
notifications/
• Receive detailed callback
• Efficient
• RealmRecyclerViewAdapter is using this
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Let others read/write
Realm realm = user.getManagementRealm();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
Boolean mayRead = true;
Boolean mayWrite = null;
boolean mayManage = false;
PermissionChange change
= new PermissionChange(realmUrl,
anotherUserID,
mayRead,
mayWrite,
mayManage);
realm.insert(change);
}
});
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Let others read/write
Realm realm = user.getManagementRealm();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
Boolean mayRead = true;
Boolean mayWrite = null;
boolean mayManage = false;
PermissionChange change
= new PermissionChange(realmUrl,
anotherUserID,
mayRead,
mayWrite,
mayManage);
realm.insert(change);
}
});
"MMPX
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Let others read/write
Realm realm = user.getManagementRealm();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
Boolean mayRead = true;
Boolean mayWrite = null;
boolean mayManage = false;
PermissionChange change
= new PermissionChange(realmUrl,
anotherUserID,
mayRead,
mayWrite,
mayManage);
realm.insert(change);
}
});
"TJUJT
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Let others read/write
Realm realm = user.getManagementRealm();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
Boolean mayRead = true;
Boolean mayWrite = null;
boolean mayManage = false;
PermissionChange change
= new PermissionChange(realmUrl,
anotherUserID,
mayRead,
mayWrite,
mayManage);
realm.insert(change);
}
});
%JTBMMPX
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Let others read/write
Realm realm = user.getManagementRealm();
realm.executeTransaction(new Realm.Transaction() {
@Override
public void execute(Realm realm) {
Boolean mayRead = true;
Boolean mayWrite = null;
boolean mayManage = false;
PermissionChange change
= new PermissionChange(realmUrl,
anotherUserID,
mayRead,
mayWrite,
mayManage);
realm.insert(change);
}
});
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Summary
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Good Points
• Offline Support and Sync
• Intuitive Query & Relation
• You can use this on-premises
• Developer Edition is FREE
• Server Side Hook is Available on Enterprise Edition
• Load Balancing is Available on Enterprise Edition
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Bad Points
• Not really, that much! Great!
• No server hook on Developer Edition
• Realm MAY affect App's Architecture
• Live Object is sometimes tricky
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Samples
• [realm-demos/realm-draw]
• https://github.com/realm-demos/realm-draw
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Which one did you like?
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Thank You!
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Thanks
• Illustrations by ͍͢ͱ
• http://www.irasutoya.com/
• Thank you so much!!!
• All the audiences! Thank you!