From 4176784892b98aaac10cb1194733e9587d87a242 Mon Sep 17 00:00:00 2001 From: Erik Brakkee Date: Wed, 23 Mar 2011 19:49:27 +0000 Subject: [PATCH] --- .../ReadWriteLockProxyFactoryTest.java | 250 ++++++++++++++++++ 1 file changed, 250 insertions(+) create mode 100644 support/general/src/test/java/org/wamblee/concurrency/ReadWriteLockProxyFactoryTest.java diff --git a/support/general/src/test/java/org/wamblee/concurrency/ReadWriteLockProxyFactoryTest.java b/support/general/src/test/java/org/wamblee/concurrency/ReadWriteLockProxyFactoryTest.java new file mode 100644 index 00000000..4582255a --- /dev/null +++ b/support/general/src/test/java/org/wamblee/concurrency/ReadWriteLockProxyFactoryTest.java @@ -0,0 +1,250 @@ +package org.wamblee.concurrency; + +import static junit.framework.Assert.*; +import static org.mockito.Matchers.*; +import static org.mockito.Mockito.*; + +import java.util.ArrayList; +import java.util.List; +import java.util.Timer; +import java.util.TimerTask; +import java.util.concurrent.atomic.AtomicInteger; + +import org.junit.Before; +import org.junit.Test; +import org.mockito.invocation.InvocationOnMock; +import org.mockito.stubbing.Answer; + +public class ReadWriteLockProxyFactoryTest { + + /** + * This test works with time intervals of this size. + */ + private static final int INTERVAL_MILLIS = 10; + + public static interface X { + void doX(int aValue); + + void doNoLocking(); + } + + public static interface Y { + void doY(String aValue); + } + + public static interface Z extends X, Y { + + } + + private final Runnable doX = new Runnable() { + public void run() { + proxyX.doX(10); + } + }; + + private final Runnable doNoLock = new Runnable() { + public void run() { + proxyX.doNoLocking(); + } + }; + + private final Runnable doY = new Runnable() { + public void run() { + proxyY.doY("hello"); + } + }; + + private ReadWriteLockProxyFactory factory; + private Z service; + private X proxyX; + private Y proxyY; + private boolean threadFailed; + private Timer timer; + private List threads; + private long tstart; + + @Before + public void setUp() { + factory = new ReadWriteLockProxyFactory(); + + threadFailed = false; + timer = new Timer(); + threads = new ArrayList(); + } + + private void startTiming() { + tstart = System.currentTimeMillis(); + } + + private float endTiming() { + return (float) (System.currentTimeMillis() - tstart) / INTERVAL_MILLIS; + } + + private void sleep(int aUnits) { + try { + Thread.sleep(aUnits * INTERVAL_MILLIS); + } catch (InterruptedException e) { + threadFailed = true; + } + } + + private void schedule(final AtomicInteger aUnstartedThreads, + final Thread aThread, int aUnits) { + aUnstartedThreads.incrementAndGet(); + timer.schedule(new TimerTask() { + @Override + public void run() { + aThread.start(); + aUnstartedThreads.decrementAndGet(); + } + }, aUnits * INTERVAL_MILLIS); + } + + private void schedule(AtomicInteger aUnstartedThreads, Runnable aTask, + int aUnits) { + Thread t = new Thread(aTask); + schedule(aUnstartedThreads, t, aUnits); + threads.add(t); + } + + private void join(AtomicInteger aUnstartedThreads, List aThreads) { + while (aUnstartedThreads.get() > 0) { + sleep(1); + } + for (Thread t : aThreads) { + try { + t.join(); + } catch (InterruptedException e) { + e.printStackTrace(); + threadFailed = true; + } + } + assertFalse(threadFailed); + } + + private void join(AtomicInteger aUnstartedThreads) { + join(aUnstartedThreads, threads); + } + + private void stubDelays() { + service = new Z() { + @ReadLock + public void doX(int aValue) { + sleep(10); + } + + @WriteLock + public void doY(String aValue) { + sleep(10); + } + + @Override + public void doNoLocking() { + sleep(10); + } + }; + + createProxy(); + Answer sleep = new Answer() { + @Override + public Object answer(InvocationOnMock aInvocation) throws Throwable { + sleep(10); + return null; + } + }; + } + + @Test + public void testProxyDelegates() { + service = mock(Z.class); + createProxy(); + assertTrue(proxyX instanceof X); + assertTrue(proxyY instanceof Y); + + proxyX.doX(10); + verify(service).doX(10); + reset(service); + + proxyY.doY("hello"); + verify(service).doY("hello"); + reset(service); + } + + private void createProxy() { + proxyX = factory.getProxy(service, X.class, Y.class); + proxyY = (Y) proxyX; + } + + @Test + public void testConcurrentReadCalls() { + stubDelays(); + startTiming(); + final int n = 4; + AtomicInteger unstarted = new AtomicInteger(); + for (int i = 0; i < n; i++) { + schedule(unstarted, doX, 0); + } + join(unstarted); + float duration = endTiming(); + assertTrue(duration < 15); + } + + @Test + public void testNoConcurrentWrites() { + stubDelays(); + startTiming(); + final int n = 2; + AtomicInteger unstarted = new AtomicInteger(); + for (int i = 0; i < n; i++) { + schedule(unstarted, doY, 0); + } + join(unstarted); + float duration = endTiming(); + System.out.println("no concurrent writes: duration " + duration); + assertTrue(duration >= n * 10); + } + + @Test + public void testConcurrentWriteAndNoLock() { + stubDelays(); + startTiming(); + AtomicInteger unstarted = new AtomicInteger(); + + schedule(unstarted, doY, 0); + for (int i = 0; i < 10; i++) { + schedule(unstarted, doNoLock, 0); + } + join(unstarted); + float duration = endTiming(); + System.out.println("concurrent write and no lock: duration: " + + duration); + assertTrue(duration < 15); + } + + @Test + public void testNoConcurrentReadAndWrite() { + stubDelays(); + startTiming(); + + AtomicInteger unstartedReaders = new AtomicInteger(); + for (int i = 0; i < 4; i++) { + schedule(unstartedReaders, doX, 0); + } + List readers = threads; + threads = new ArrayList(); + // start the write some time later. + AtomicInteger unstartedWriters = new AtomicInteger(); + schedule(unstartedWriters, doY, 5); + + join(unstartedReaders, readers); + float duration = endTiming(); + System.out.println("no concurrent read and write: readers duration: " + + duration); + assertTrue(duration < 15); + join(unstartedWriters, threads); + duration = endTiming(); + System.out.println("no concurrent read and write: writer duration: " + + duration); + assertTrue(duration >= 20 && duration <= 25); + } +} -- 2.31.1