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Enterprise Java User Group Austria
March 05, 2012
Technology
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Vaclav Pech on GPars
Enterprise Java User Group Austria
March 05, 2012
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Transcript
GPars Promises to keep Václav Pech
About me ['Passionate programmer', 'Concurrency enthusiast', 'GPars lead', 'Developer/technology evangelist
@ JetBrains' ].eachParallel {say it} http://www.jroller.com/vaclav http://twitter.com/vaclav_pech
We're all parallel now Use them or leave them!
None
# of cores
# of cores Today Soon
Dealing with threads sucks! public class Counter { private static
long count = 0; public Counter() { count++; } }
Dealing with threads sucks! public class Counter { private static
long count = 0; public Counter() { synchronized (this) { count++; } } }
Dealing with threads sucks! public class Counter { private static
long count = 0; public Counter() { synchronized (this.getClass()) { count++; } } }
Dealing with threads sucks! public class ClickCounter implements ActionListener {
public ClickCounter(JButton button) { button.addActionListener(this); } public void actionPerformed(final ActionEvent e) { ... } }
images.eachParallel {it.process()} documents.sumParallel() candidates.maxParallel {it.salary}.marry() Parallel Collections
Parallel Collections progLanguages.parallel.filter {it.concurrent} .max {it.javaInteroperability} .map {it.logo} ==
Fork/Join Solve hierarchical problems Divide and conquer
Merge sort, Quick sort Tree traversal File scan / search … [a, b, c, d, e, f, g, h] [a, b, c, d] [e, f, g, h] [a, b] [c, d] [e, f] [g, h]
Thread Pool Tasks Worker threads Queue
Thread Pool Contention!
Fork/Join Thread Pool
Fork/Join Thread Pool Work stealing
Languages are either concurrent or obsolete.
Java 5 Asynchronous calculations
Java 7 Asynchronous calculations Fork/Join
Java 8 Asynchronous calculations Fork/Join Parallel collections
Scala Asynchronous calculations Fork/Join Parallel collections Actors
Clojure Asynchronous calculations Fork/Join Parallel collections Actors Agents, Stm
Oz Asynchronous calculations Fork/Join Parallel collections Actors Agents, Stm Dataflow
Google's Go Asynchronous calculations Fork/Join Parallel collections Actors Agents, Stm
Dataflow CSP
Asynchronous calculations Fork/Join Parallel collections Actors Agents, Stm Dataflow CSP
Asynchronous calculations Fork/Join Parallel collections Actors Agents, Stm Dataflow CSP
Agenda
Actors Processes with a mail-box Share no data Communicate by
sending messages Use a thread-pool
Stateless Actors (pure Java) class MyActor extends DynamicDispatchActor { Account
account = ... public void onMessage(String msg) { String encripted = encrypt(msg); reply(encripted); } public void onMessage(Integer number) { reply(2 * number); } public void onMessage(Money cash) { System.out.println("Received a donation " + cash); account.deposit(cash); } }
Active Objects @ActiveObject class MyCounter { private int counter =
0 @ActiveMethod def incrementBy(int value) { println "Received an integer: $value" this.counter += value } }
Composing async functions int hash1 = hash(download('http://www.gpars.org')) int hash2 =
hash(loadFile('/gpars/website/index.html')) boolean result = compare(hash1, hash2) println result
Composing async functions @AsyncFun hash = oldHash @AsyncFun compare =
oldCompare @AsyncFun download = oldDownload @AsyncFun loadFile = oldLoadFile def hash1 = hash(download('http://www.gpars.org')) def hash2 = hash(loadFile('/gpars/website/index.html')) def result = compare(hash1, hash2) println result.get()
Composing async functions @AsyncFun hash = oldHash @AsyncFun(blocking = true)
compare = oldCompare @AsyncFun download = oldDownload @AsyncFun loadFile = oldLoadFile def hash1 = hash(download('http://www.gpars.org')) def hash2 = hash(loadFile('/gpars/website/index.html')) boolean result = compare(hash1, hash2) println result
int hash(String text) {…} Promise<int> hash(Promise<String> | String text)
int hash(String text) {…} Promise<int> hash(Promise<String> | String text) compare(
hash( download() ), hash( loadFile() ) )
int hash(String text) {…} Promise<int> hash(Promise<String> | String text) {
1.Return a Promise for the result 2.Wait (non-blocking) for the text param 3.Call the original hash() 4.Bind the result }
Composing async functions Combine functions as usual Parallelism is detected
automatically
Dataflow Concurrency No race-conditions No live-locks Deterministic
deadlocks Completely deterministic programs BEAUTIFUL code (Jonas Bonér)
Dataflow Variables / Promises main task2 task3 x y z
task1
Dataflows def df = new Dataflows() task { df.z =
df.x + df.y } task { df.x = 10 } task { println ”I am task 3” df.y = 5 } assert 15 == df.z
operator(inputs: [headers, bodies, footers], outputs: [articles, summaries]) {header, body, footer
-> def article = buildArticle(header, body, footer) bindOutput(0, article) bindOutput(1, buildSummary(article)) } * + <> Dataflow Operators
Url resolver Url resolver Downloader Groovy scanner Scala scanner Url
resolver Url resolver Reporter Speculator Evaluator Splitter Confirm Cache updates Approvals Dataflow Operators
None
'coz concurrency is Groovy Find more at: http://gpars.codehaus.org http://www.jroller.com/vaclav http://twitter.com/vaclav_pech
GPars