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/*
 * Copyright 2008 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package com.google.gwt.junit;

import com.google.gwt.junit.client.TimeoutException;
import com.google.gwt.junit.client.impl.JUnitHost.ClientInfo;
import com.google.gwt.junit.client.impl.JUnitHost.TestBlock;
import com.google.gwt.junit.client.impl.JUnitHost.TestInfo;
import com.google.gwt.junit.client.impl.JUnitResult;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.IdentityHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

/**
 * A message queue to pass data between {@link JUnitShell} and
 * {@link com.google.gwt.junit.server.JUnitHostImpl} in a thread-safe manner.
 * 
 * 

* The public methods are called by the servlet to find out what test to execute * next, and to report the results of the last test to run. *

* *

* The protected methods are called by the shell to fetch test results and drive * the next test the client should run. *

*/ public class JUnitMessageQueue { /** * Server-side client info that includes a description. */ public static class ClientInfoExt extends ClientInfo { /** * A description of this client. */ private final String desc; public ClientInfoExt(int sessionId, String desc) { super(sessionId); this.desc = desc; } public String getDesc() { return desc; } } /** * Holds the state of an individual client. */ public static class ClientStatus { private int blockIndex = 0; private ClientInfoExt clientInfo; private boolean isNew = true; public ClientStatus(ClientInfoExt clientInfo) { this.clientInfo = clientInfo; } public String getDesc() { return clientInfo.getDesc(); } public int getId() { return clientInfo.getSessionId(); } @Override public String toString() { return clientInfo.getDesc(); } public void updateClientInfo(ClientInfoExt clientInfo) { this.clientInfo = clientInfo; } } /** * Records results for each client; must lock before accessing. */ private final Map clientStatuses = new HashMap(); /** * The lock used to synchronize access to clientStatuses. */ private final Object clientStatusesLock = new Object(); /** * Set to true when the last test block has been added. This is used to tell * clients that all tests are complete. */ private boolean isLastTestBlockAvailable; /** * The number of TestCase clients executing in parallel. */ private int numClients = 1; /** * The list of test blocks to run. */ private final List testBlocks = new ArrayList(); /** * Maps the TestInfo to the results from each clientId. If JUnitResult is * null, it means that the client requested the test but did not report the * results yet. */ private final Map> testResults = new HashMap>(); /** * Only instantiable within this package. */ JUnitMessageQueue(int numClients) { this.numClients = numClients; } /** * Called by the servlet to query for for the next block to test. * * @param clientInfo information about the client * @param blockIndex the index of the test block to get * @param timeout how long to wait for an answer * @return the next test to run, or null if * timeout is exceeded or the next test does not match * testClassName */ public TestBlock getTestBlock(ClientInfoExt clientInfo, int blockIndex, long timeout) throws TimeoutException { synchronized (clientStatusesLock) { ClientStatus clientStatus = ensureClientStatus(clientInfo); clientStatus.blockIndex = blockIndex; // The client has finished all of the tests. if (isLastTestBlockAvailable && blockIndex >= testBlocks.size()) { return null; } long startTime = System.currentTimeMillis(); long stopTime = startTime + timeout; while (blockIndex >= testBlocks.size()) { long timeToWait = stopTime - System.currentTimeMillis(); if (timeToWait < 1) { double elapsed = (System.currentTimeMillis() - startTime) / 1000.0; throw new TimeoutException("The servlet did not respond to the " + "next query to test within " + timeout + "ms.\n" + " Client description: " + clientInfo.getDesc() + "\n" + " Actual time elapsed: " + elapsed + " seconds.\n"); } try { clientStatusesLock.wait(timeToWait); } catch (InterruptedException e) { /* * Should never happen; but if it does, just send a null back to the * client, which will cause it to stop running tests. */ System.err.println("Unexpected thread interruption"); e.printStackTrace(); return null; } } // Record that this client has retrieved the current tests. TestInfo[] tests = testBlocks.get(blockIndex); for (TestInfo testInfo : tests) { ensureResults(testInfo).put(clientStatus, null); } return new TestBlock(tests, blockIndex); } } /** * Reports a failure from a client that cannot startup. * * @param clientInfo information about the client * @param result the failure result */ public void reportFatalLaunch(ClientInfoExt clientInfo, JUnitResult result) { // Fatal launch error, cause this client to fail the whole block. ClientStatus clientStatus = ensureClientStatus(clientInfo); Map results = new HashMap(); for (TestInfo testInfo : testBlocks.get(clientStatus.blockIndex)) { results.put(testInfo, result); } reportResults(clientInfo, results); } /** * Called by the servlet to report the results of the last test to run. * * @param clientInfo information about the client * @param results the result of running the test block */ public void reportResults(ClientInfoExt clientInfo, Map results) { synchronized (clientStatusesLock) { if (results == null) { throw new IllegalArgumentException("results cannot be null"); } ClientStatus clientStatus = ensureClientStatus(clientInfo); // Cache the test results. for (Map.Entry entry : results.entrySet()) { TestInfo testInfo = entry.getKey(); ensureResults(testInfo).put(clientStatus, entry.getValue()); } clientStatusesLock.notifyAll(); } } /** * Called by the shell to add test blocks to test. * * @param isLastBlock true if this is the last test block that will be added */ void addTestBlocks(List newTestBlocks, boolean isLastBlock) { synchronized (clientStatusesLock) { if (isLastTestBlockAvailable) { throw new IllegalArgumentException( "Cannot add test blocks after the last block is added"); } for (TestInfo[] testBlock : newTestBlocks) { if (testBlock.length == 0) { throw new IllegalArgumentException("TestBlocks cannot be empty"); } } testBlocks.addAll(newTestBlocks); if (isLastBlock) { isLastTestBlockAvailable = true; } clientStatusesLock.notifyAll(); } } /** * Returns any new clients that have contacted the server since the last call. * The same client will never be returned from this method twice. */ String[] getNewClients() { synchronized (clientStatusesLock) { List results = new ArrayList(); for (ClientStatus clientStatus : clientStatuses.values()) { if (clientStatus.isNew) { results.add(clientStatus.getDesc()); // Record that this client is no longer new. clientStatus.isNew = false; } } clientStatusesLock.notifyAll(); return results.toArray(new String[results.size()]); } } int getNumClients() { return numClients; } /** * Returns how many clients have requested the currently-running test. * * @param testInfo the {@link TestInfo} that the clients retrieved */ int getNumClientsRetrievedTest(TestInfo testInfo) { synchronized (clientStatusesLock) { int count = 0; Map results = testResults.get(testInfo); if (results != null) { count = results.size(); } return count; } } /** * Returns how many clients have connected. */ int getNumConnectedClients() { synchronized (clientStatusesLock) { return clientStatuses.size(); } } /** * Fetches the results of a completed test. * * @param testInfo the {@link TestInfo} to check for results * @return A map of results from all clients. */ Map getResults(TestInfo testInfo) { synchronized (clientStatusesLock) { return testResults.get(testInfo); } } /** * Visible for testing. * * @return the test blocks */ List getTestBlocks() { return testBlocks; } /** * Returns a pretty printed list of clients that have not retrieved the * current test. Used for error reporting. * * @param testInfo the {@link TestInfo} we are waiting for * @return a string containing the list of clients that have not retrieved the * current test. */ String getUnretrievedClients(TestInfo testInfo) { synchronized (clientStatusesLock) { Map results = testResults.get(testInfo); StringBuilder buf = new StringBuilder(); int lineCount = 0; for (ClientStatus clientStatus : clientStatuses.values()) { if (lineCount > 0) { buf.append('\n'); } if (results == null || !results.containsKey(clientStatus)) { buf.append(" - NO RESPONSE: "); } else { buf.append(" - (ok): "); } buf.append(clientStatus.getDesc()); ++lineCount; } int difference = numClients - getNumClientsRetrievedTest(testInfo); if (difference > 0) { if (lineCount > 0) { buf.append('\n'); } buf.append(" - " + difference + " client(s) haven't responded back to JUnitShell since the start of the test."); } return buf.toString(); } } /** * Returns a human-formatted message identifying what clients have connected * but have not yet reported results for this test. It is used in a timeout * condition, to identify what we're still waiting on. * * @param testInfo the {@link TestInfo} that the clients are working on * @return human readable message */ String getWorkingClients(TestInfo testInfo) { synchronized (clientStatusesLock) { // Print a list of clients that have connected but not returned results. int itemCount = 0; StringBuilder buf = new StringBuilder(); Map results = testResults.get(testInfo); if (results != null) { for (Map.Entry entry : results.entrySet()) { if (entry.getValue() == null) { buf.append(entry.getKey().getDesc()); buf.append("\n"); itemCount++; } } } // Print the number of other clients. int difference = numClients - itemCount; if (difference > 0) { if (itemCount > 0) { buf.append('\n'); } buf.append(difference + " other client(s) haven't responded back to JUnitShell since the start of the test."); } return buf.toString(); } } /** * Called by the shell to see if the currently-running test has completed. * * @param testInfo the {@link TestInfo} to check for results * @return If the test has completed, true, otherwise * false. */ boolean hasResults(TestInfo testInfo) { synchronized (clientStatusesLock) { Map results = testResults.get(testInfo); if (results == null || results.size() < numClients) { return false; } for (JUnitResult result : results.values()) { if (result == null) { return false; } } return true; } } /** * Returns true iff any there are no results, missing results, or any of the * test results is an exception other than those in {@code * THROWABLES_NOT_RETRIED}. */ boolean needsRerunning(TestInfo testInfo) { Map results = getResults(testInfo); if (results == null) { return true; } if (results.size() != numClients) { return true; } for (Entry entry : results.entrySet()) { JUnitResult result = entry.getValue(); if (result == null) { return true; } if (isNonFatalFailure(result)) { return true; } } return false; } private boolean isNonFatalFailure(JUnitResult result) { return result.isAnyException() && !result.isExceptionOf(Error.class) && !result.isExceptionOf(JUnitFatalLaunchException.class); } void removeResults(TestInfo testInfo) { synchronized (clientStatusesLock) { testResults.remove(testInfo); } } void waitForResults(int millis) { synchronized (clientStatusesLock) { try { clientStatusesLock.wait(millis); } catch (InterruptedException e) { } } } /** * Ensure that a {@link ClientStatus} for the clientId exists. * * @param clientId the id of the client * @return the {@link ClientStatus} for the client */ private ClientStatus ensureClientStatus(ClientInfoExt clientInfo) { int id = clientInfo.getSessionId(); ClientStatus clientStatus = clientStatuses.get(id); if (clientStatus == null) { clientStatus = new ClientStatus(clientInfo); clientStatuses.put(id, clientStatus); } else { // Maybe update the client info (IP might change if through a proxy). clientStatus.updateClientInfo(clientInfo); } return clientStatus; } /** * Get the map of test results from all clients for a given {@link TestInfo}, * creating it if necessary. * * @param testInfo the {@link TestInfo} * @return the map of all results */ private Map ensureResults(TestInfo testInfo) { Map results = testResults.get(testInfo); if (results == null) { results = new IdentityHashMap(); testResults.put(testInfo, results); } return results; } }




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