Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Timing is Everything
Search
Sponsored
·
Your Podcast. Everywhere. Effortlessly.
Share. Educate. Inspire. Entertain. You do you. We'll handle the rest.
→
katfishi
March 18, 2016
Programming
0
160
Timing is Everything
katfishi
March 18, 2016
Tweet
Share
More Decks by katfishi
See All by katfishi
Introduction to React Native
katfishi
1
160
Fancy Acronyms for Fancy Architectures
katfishi
0
240
Other Decks in Programming
See All in Programming
Architectural Extensions
denyspoltorak
0
280
なるべく楽してバックエンドに型をつけたい!(楽とは言ってない)
hibiki_cube
0
140
CSC307 Lecture 06
javiergs
PRO
0
680
Implementation Patterns
denyspoltorak
0
280
humanlayerのブログから学ぶ、良いCLAUDE.mdの書き方
tsukamoto1783
0
190
Patterns of Patterns
denyspoltorak
0
1.4k
AgentCoreとHuman in the Loop
har1101
5
230
CSC307 Lecture 09
javiergs
PRO
1
830
Smart Handoff/Pickup ガイド - Claude Code セッション管理
yukiigarashi
0
130
そのAIレビュー、レビューしてますか? / Are you reviewing those AI reviews?
rkaga
6
4.5k
dchart: charts from deck markup
ajstarks
3
990
Oxlint JS plugins
kazupon
1
870
Featured
See All Featured
Sam Torres - BigQuery for SEOs
techseoconnect
PRO
0
180
Redefining SEO in the New Era of Traffic Generation
szymonslowik
1
210
Gemini Prompt Engineering: Practical Techniques for Tangible AI Outcomes
mfonobong
2
280
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
231
22k
BBQ
matthewcrist
89
10k
Self-Hosted WebAssembly Runtime for Runtime-Neutral Checkpoint/Restore in Edge–Cloud Continuum
chikuwait
0
320
Unsuck your backbone
ammeep
671
58k
Heart Work Chapter 1 - Part 1
lfama
PRO
5
35k
It's Worth the Effort
3n
188
29k
The B2B funnel & how to create a winning content strategy
katarinadahlin
PRO
0
270
Imperfection Machines: The Place of Print at Facebook
scottboms
269
14k
Leo the Paperboy
mayatellez
4
1.4k
Transcript
Timing is Everything Katheryn Shi @Katfishi
None
141 partners worldwide 1,825 courses 3 million downloads
Timer ScheduledThreadPoolExecutor Handler AlarmManager
Timer
Timer timer = new Timer(); TimerTask task = new TimerTask()
{ @Override public void run() { // task here } }
timer.schedule(task, new Date()); timer.schedule(task, TIME_DELAY);
timer.schedule( task, new Date(), PERIOD); timer.schedule( task, TIME_DELAY, PERIOD);
timer.scheduleAtFixedRate( task, new Date(), PERIOD); timer.scheduleAtFixedRate( task, TIME_DELAY, PERIOD);
Coffee Break
fixed-period fixed-rate 10 am 11 am 12 pm 1 pm
2 pm
task.cancel(); timer.cancel(); timer.purge();
Reusable?
Which Thread?
TimerTask lengthy = new TimerTask() { @Override public void run()
{ lengthyOperation(); } }
TimerTask task = new TimerTask() { @Override public void run()
{ flipBackgroundColor(); } }
timer.schedule(task, 1000); timer.schedule(lengthy, 0);
None
+ Simple – Memory leaks – Single thread – Not
reusable – Little control
None
None
ScheduledThreadPoolExecutor / ScheduledExecutorService
ScheduledExecutorService service = Executors .newSingleThreadScheduledExecutor();
ScheduledExecutorService service = Executors.newScheduledThreadPool(2);
Runnable r = new Runnable() { @Override public void run()
{ // task here } }
ScheduledFuture future = service.schedule(r, 10, TimeUnit.SECONDS); future.cancel(true);
TimeUnit.DAYS TimeUnit.HOURS TimeUnit.MINUTES TimeUnit.SECONDS TimeUnit.MILLISECONDS TimeUnit.MICROSECONDS TimeUnit.NANOSECONDS
scheduleAtFixedRate(Runnable, long, long, TimeUnit) scheduleWithFixedDelay(Runnable, long, long, TimeUnit)
scheduleAtFixedRate scheduleWithFixedDelay 10 am 11 am 12 pm 1 pm
2 pm
service.shutdown(); List<Runnable> unexecuted = service.shutdownNow();
Reusable?
Which Thread?
None
+ Multiple threads + More control + Reusable – Complicated
None
Handler
Message Queue Handler Handler Looper M M M
Message Queue Handler Handler Looper M M M
Message Queue Handler Handler Looper M M M
Message Queue Handler Handler Looper M M M
Message Queue Handler Handler Looper M M M
Handler handler = new Handler(); Runnable r = new Runnable()
{ @Override public void run() { // task here } }
handler.postDelayed(r, TIME_DELAY); handler.postAtTime(r, UPTIME_MILLIS);
Runnable r = new Runnable() { @Override public void run()
{ // task here handler.postDelayed(this, TIME_DELAY); } }
handler.removeCallbacks(r);
Reusable?
Which Thread?
+ Android + More control + Reusable – Long operations
AlarmManager
AlarmManager am = (AlarmManager) getSystemService(ALARM_SERVICE);
public static class AlarmReceiver extends BroadcastReceiver { @Override public void
onReceive(Context context, Intent intent) { // task here } }
Intent i = new Intent( MainActivity.this, AlarmReceiver.class); PendingIntent pi =
PendingIntent .getBroadcast( MainActivity.this, REQUEST_CODE, i, FLAGS);
am.set(AlarmManager.RTC_WAKEUP, TRIGGER_TIME, pi); am.setRepeating( AlarmManager.RTC_WAKEUP, TRIGGER_TIME, INTERVAL, pi);
AlarmManager.RTC_WAKEUP AlarmManager.RTC AlarmManager.ELAPSED_REALTIME_WAKEUP AlarmManager.ELAPSED_REALTIME
am.cancel(pi);
+ Sleep control – Complex
quick fix Timer more control ScheduledThreadPoolExecutor easy Android Handler wake
up AlarmManager
@Katfishi github.com/katfishi kshi@ .org