An introduction to Apache Thrift

A short introduction to Apache Thrift, what is it and how does it work ?
How can it help to define multi language client/server interfaces ?

Transcript

1. Apache Thrift • What is it ? • Languages • Process • Architecture • Example www.semtech-solutions.co.nz info@semtech-solutions.co.nz
2. Apache Thrift – What is it ? • A multi language software framework • For client / services development • It is scalable • Uses a compiler to generate source code • Released with Apache 2 License • Uses an IDL ( interface descripton language ) • Originally developed at Facebook www.semtech-solutions.co.nz info@semtech-solutions.co.nz
3. Apache Thrift – Languages Languages supported – C++ Cocoa – Java JavaScript – Python Node.js – PHP Smalltalk – Ruby OCaml – Erlang Delphi – Perl ..... and others – Haskell – C# www.semtech-solutions.co.nz info@semtech-solutions.co.nz
4. Apache Thrift – Process So how do we start to create a Thrift based app ? – We define a Thrift file • Which includes our interface definition • Defines our Thrift types • Defines our services – Our clients will be able to call our services – We now use the Thrift compiler • thrift --gen <language> <Thrift file> – To generate our source code – Now we add our extra client / server functionality www.semtech-solutions.co.nz info@semtech-solutions.co.nz
5. Apache Thrift – Service www.semtech-solutions.co.nz info@semtech-solutions.co.nz
6. Apache Thrift – Where used ? So who is using Thrift ? – Cassandra – Scribe – Hadoop – Hbase – ThriftDB – Others ......... www.semtech-solutions.co.nz info@semtech-solutions.co.nz
7. Apache Thrift Architecture www.semtech-solutions.co.nz info@semtech-solutions.co.nz
8. Apache Thrift – Example (Java) Create Thrift interface file # time.thrift namespace java tserver.gen typedef i64 Timestamp service TimeServer { Timestamp time() } Compile to Java code thrift --gen java time.thrift www.semtech-solutions.co.nz info@semtech-solutions.co.nz
9. Apache Thrift – Example Create interface in TimeServerImpl.java package server; import org.apache.thrift.TException; import tserver.gen.*; class TimeServerImpl implements TimeServer.Iface { @Override public long time() throws TException { long time = System.currentTimeMillis(); System.out.println("time() called: " + time); return time; } } www.semtech-solutions.co.nz info@semtech-solutions.co.nz
10. Apache Thrift – Example – Java Server package server; import java.io.IOException; import org.apache.thrift.protocol.TBinaryProtocol; import org.apache.thrift.protocol.TBinaryProtocol.Factory; import org.apache.thrift.server.TServer; import org.apache.thrift.server.TThreadPoolServer; import org.apache.thrift.transport.TServerSocket; import org.apache.thrift.transport.TTransportException; import tserver.gen.TimeServer; public class Server { private void start(){ try { TServerSocket serverTransport = new TServerSocket(7911); TimeServer.Processor processor = new TimeServer.Processor(new TimeServerImpl()); Factory protFactory = new TBinaryProtocol.Factory(true, true); TServer server = new TThreadPoolServer(processor, serverTransport, protFactory); System.out.println("Starting server on port 7911 ..."); server.serve(); } catch (TTransportException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static void main(String args[]){ Server srv = new Server(); srv.start(); } } www.semtech-solutions.co.nz info@semtech-solutions.co.nz
11. Apache Thrift – Example – Java Client package client; import java.net.SocketException; import org.apache.thrift.TException; import org.apache.thrift.protocol.TBinaryProtocol; import org.apache.thrift.protocol.TProtocol; import org.apache.thrift.transport.TSocket; import org.apache.thrift.transport.TTransport; import org.apache.thrift.transport.TTransportException; import tserver.gen.TimeServer.Client; public class TimeClient { private void start(){ TTransport transport; try { transport = new TSocket("localhost", 7911); TProtocol protocol = new TBinaryProtocol(transport);Client client = new Client(protocol); transport.open(); long time = client.time(); System.out.println("Time from server:" + time); transport.close(); } catch (SocketException e) { e.printStackTrace(); } catch (TTransportException e) { e.printStackTrace();} catch (TException e) { e.printStackTrace(); } } public static void main(String[] args) { TimeClient c = new TimeClient(); c.start(); } } www.semtech-solutions.co.nz info@semtech-solutions.co.nz
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