Java tutorial
/* * ************************************************************************************* * Copyright (C) 2008 EsperTech, Inc. All rights reserved. * * http://esper.codehaus.org * * http://www.espertech.com * * ---------------------------------------------------------------------------------- * * The software in this package is published under the terms of the GPL license * * a copy of which has been included with this distribution in the license.txt file. * * ************************************************************************************* */ package com.espertech.esper.multithread; import junit.framework.TestCase; import com.espertech.esper.client.*; import com.espertech.esper.support.bean.SupportMarketDataBean; import com.espertech.esper.support.util.SupportMTUpdateListener; import com.espertech.esper.client.EventBean; import java.util.concurrent.*; import java.util.Arrays; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; /** * Test for multithread-safety of statements that are very similar that is share the same filter and views. * <p> * The engine shares locks between statements that share filters and views. */ public class TestMTStmtSharedView extends TestCase { private static String[] SYMBOLS = { "IBM", "MSFT", "GE" }; private EPServiceProvider engine; public void setUp() { Configuration config = new Configuration(); config.getEngineDefaults().getThreading().setInternalTimerEnabled(false); engine = EPServiceProviderManager.getProvider("TestMTStmtSharedView", config); } public void tearDown() { engine.destroy(); } public void testSharedViews() throws Exception { trySend(4, 500, 100); //trySend(2, 1000, 100); //trySend(3, 2000, 20); } private void trySend(int numThreads, int numRepeats, int numStatements) throws Exception { // Create same statement X times EPStatement stmt[] = new EPStatement[numStatements]; SupportMTUpdateListener listeners[] = new SupportMTUpdateListener[stmt.length]; for (int i = 0; i < stmt.length; i++) { stmt[i] = engine.getEPAdministrator().createEPL(" select * " + " from " + SupportMarketDataBean.class.getName() + ".std:groupwin(symbol).stat:uni(price)"); listeners[i] = new SupportMTUpdateListener(); stmt[i].addListener(listeners[i]); } // Start send threads // Each threads sends each symbol with price = 0 to numRepeats long startTime = System.currentTimeMillis(); ExecutorService threadPool = Executors.newFixedThreadPool(numThreads); Future future[] = new Future[numThreads]; for (int i = 0; i < numThreads; i++) { Callable callable = new StmtSharedViewCallable(numRepeats, engine, SYMBOLS); future[i] = threadPool.submit(callable); } // Shut down threadPool.shutdown(); threadPool.awaitTermination(10, TimeUnit.SECONDS); for (int i = 0; i < numThreads; i++) { assertTrue((Boolean) future[i].get()); } long endTime = System.currentTimeMillis(); long delta = endTime - startTime; assertTrue("delta=" + delta + " not less then 5 sec", delta < 5000); // should take less then 5 seconds even for 100 statements as they need to share resources thread-safely // Assert results for (SupportMTUpdateListener listener : listeners) { assertEquals(numRepeats * numThreads * SYMBOLS.length, listener.getNewDataList().size()); EventBean[] newDataLast = listener.getNewDataList().get(listener.getNewDataList().size() - 1); assertEquals(1, newDataLast.length); EventBean result = newDataLast[0]; assertEquals(numRepeats * numThreads, ((Long) result.get("datapoints")).longValue()); assertTrue(Arrays.asList(SYMBOLS).contains(result.get("symbol"))); assertEquals(sumToN(numRepeats) * numThreads, result.get("total")); listener.reset(); } for (int i = 0; i < stmt.length; i++) { stmt[i].stop(); } } private double sumToN(int N) { double sum = 0; for (int i = 0; i < N; i++) { sum += i; } return sum; } private static Log log = LogFactory.getLog(TestMTStmtSharedView.class); }