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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.client.impl;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.Scheduler;
import com.google.gwt.http.client.UrlBuilder;
import com.google.gwt.junit.client.GWTTestCase;
import com.google.gwt.junit.client.impl.JUnitHost.ClientInfo;
import com.google.gwt.junit.client.impl.JUnitHost.InitialResponse;
import com.google.gwt.junit.client.impl.JUnitHost.TestBlock;
import com.google.gwt.junit.client.impl.JUnitHost.TestInfo;
import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.rpc.ServiceDefTarget;
import java.util.HashMap;
/**
* The entry point class for GWTTestCases.
*
* This is the main test running logic. Each time a test completes, the results
* are reported back through {@link #junitHost}, and the next method to run is
* returned. This process repeats until the next method to run is null.
*/
public class GWTRunner implements EntryPoint {
private final class InitialResponseListener implements
AsyncCallback {
/**
* Delegate to the {@link TestBlockListener}.
*/
@Override
public void onFailure(Throwable caught) {
testBlockListener.onFailure(caught);
}
/**
* Update our client info with the server-provided session id then delegate
* to the {@link TestBlockListener}.
*/
@Override
public void onSuccess(InitialResponse result) {
clientInfo = new ClientInfo(result.getSessionId());
testBlockListener.onSuccess(result.getTestBlock());
}
}
/**
* The RPC callback object for {@link GWTRunner#junitHost}. When
* {@link #onSuccess} is called, it's time to run the next test case.
*/
private final class TestBlockListener implements AsyncCallback {
/**
* The number of times we've failed to communicate with the server on the
* current test batch.
*/
private int curRetryCount = 0;
/**
* A call to junitHost failed.
*/
@Override
public void onFailure(Throwable caught) {
if (curRetryCount++ < MAX_RETRY_COUNT) {
reportWarning("Retrying syncing back to junit backend. (Exception: " + caught + ")");
// Try the call again
new Timer() {
@Override
public void run() {
syncToServer();
}
}.schedule(1000);
} else {
reportFatalError("Cannot sync back to junit backend: " + caught);
}
}
/**
* A call to junitHost succeeded; run the next test case.
*/
@Override
public void onSuccess(TestBlock nextTestBlock) {
curRetryCount = 0;
currentBlock = nextTestBlock;
currentTestIndex = 0;
currentResults.clear();
if (currentBlock != null && currentBlock.getTests().length > 0) {
doRunTest();
}
}
}
/**
* The singleton instance.
*/
static GWTRunner sInstance;
/**
* A query param specifying my unique session cookie.
*/
private static final String SESSIONID_QUERY_PARAM = "gwt.junit.sessionId";
/**
* The maximum number of times to retry communication with the server per test batch.
*/
private static final int MAX_RETRY_COUNT = 3;
/**
* A query param specifying the block index to start on.
*/
private static final String BLOCKINDEX_QUERY_PARAM = "gwt.junit.blockindex";
public static GWTRunner get() {
return sInstance;
}
/**
* This client's info.
*/
private ClientInfo clientInfo;
/**
* The current block of tests to execute.
*/
private TestBlock currentBlock;
/**
* Active test within current block of tests.
*/
private int currentTestIndex = 0;
/**
* Results for all test cases in the current block.
*/
private HashMap currentResults = new HashMap();
/**
* If set, all remaining tests will fail with the failure message.
*/
private String failureMessage;
/**
* The remote service to communicate with.
*/
private final JUnitHostAsync junitHost = (JUnitHostAsync) GWT.create(JUnitHost.class);
/**
* Handles all {@link InitialResponse InitialResponses}.
*/
private final InitialResponseListener initialResponseListener = new InitialResponseListener();
/**
* Handles all {@link TestBlock TestBlocks}.
*/
private final TestBlockListener testBlockListener = new TestBlockListener();
private GWTTestAccessor testAccessor;
// TODO(FINDBUGS): can this be a private constructor to avoid multiple
// instances?
public GWTRunner() {
sInstance = this;
// Bind junitHost to the appropriate url.
ServiceDefTarget endpoint = (ServiceDefTarget) junitHost;
String url = GWT.getModuleBaseURL() + "junithost";
endpoint.setServiceEntryPoint(url);
// Null out the default uncaught exception handler since we will control it.
GWT.setUncaughtExceptionHandler(null);
}
@Override
public void onModuleLoad() {
testAccessor = new GWTTestAccessor();
clientInfo = new ClientInfo(parseQueryParamInteger(SESSIONID_QUERY_PARAM, -1));
// Kick off the test running process by getting the first method to run from the server.
syncToServer();
}
public void reportResultsAndGetNextMethod(JUnitResult result) {
if (failureMessage != null) {
RuntimeException ex = new RuntimeException(failureMessage);
result.setException(ex);
}
TestInfo currentTest = getCurrentTest();
currentResults.put(currentTest, result);
++currentTestIndex;
if (currentTestIndex < currentBlock.getTests().length) {
// Run the next test after a short delay.
Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() {
@Override
public void execute() {
doRunTest();
}
});
} else {
syncToServer();
}
}
/**
* Executes a test on provided test class instance.
*/
public void executeTestMethod(GWTTestCase testCase, String className, String methodName)
throws Throwable {
testAccessor.invoke(testCase, className, methodName);
}
private void doRunTest() {
// Make sure the module matches.
String currentModule = GWT.getModuleName();
String newModule = getCurrentTest().getTestModule();
if (currentModule.equals(newModule)) {
// The module is correct.
runTest();
} else {
/*
* We're being asked to run a test in a different module. We must navigate
* the browser to a new URL which will run that other module. We retain
* the same path suffix (e.g., '/junit.html') as the current URL.
*/
String currentPath = Window.Location.getPath();
String pathSuffix = currentPath.substring(currentPath.lastIndexOf('/'));
UrlBuilder builder = Window.Location.createUrlBuilder();
builder.setParameter(BLOCKINDEX_QUERY_PARAM,
Integer.toString(currentBlock.getIndex())).setPath(
newModule + pathSuffix);
// Hand off the session id to the next module.
if (clientInfo.getSessionId() >= 0) {
builder.setParameter(SESSIONID_QUERY_PARAM,
String.valueOf(clientInfo.getSessionId()));
}
// Replace "%3A" with ":" as a hack to support broken DevMode plugins.
Window.Location.replace(builder.buildString().replaceAll("%3A", ":"));
currentBlock = null;
currentTestIndex = 0;
}
}
private TestInfo getCurrentTest() {
return currentBlock.getTests()[currentTestIndex];
}
/**
* Parse an integer from a query parameter, returning the default value if
* the parameter cannot be found.
*
* @param paramName the parameter name
* @param defaultValue the default value
* @return the integer value of the parameter
*/
private int parseQueryParamInteger(String paramName, int defaultValue) {
String value = Window.Location.getParameter(paramName);
if (value != null) {
try {
return Integer.parseInt(value);
} catch (NumberFormatException e) {
setFailureMessage("'" + value + "' is not a valid value for " +
paramName + ".");
return defaultValue;
}
}
return defaultValue;
}
private void runTest() {
// Dynamically create a new test case.
TestInfo currentTest = getCurrentTest();
GWTTestCase testCase = null;
try {
testCase = testAccessor.newInstance(currentTest.getTestClass());
} catch (Throwable e) {
RuntimeException ex = new RuntimeException(currentTest
+ ": could not instantiate the requested class", e);
JUnitResult result = new JUnitResult();
result.setException(ex);
reportResultsAndGetNextMethod(result);
return;
}
testCase.init(currentTest.getTestClass(), currentTest.getTestMethod());
testCase.__doRunTest();
}
/**
* Fail all tests with the specified message.
*/
private void setFailureMessage(String message) {
failureMessage = message;
}
private void syncToServer() {
if (currentBlock == null) {
int firstBlockIndex = parseQueryParamInteger(BLOCKINDEX_QUERY_PARAM, 0);
junitHost.getTestBlock(firstBlockIndex, clientInfo,
initialResponseListener);
} else {
junitHost.reportResultsAndGetTestBlock(currentResults,
currentBlock.getIndex() + 1, clientInfo, testBlockListener);
}
}
private static native void reportFatalError(String errorMsg)/*-{
$wnd.junitError("/fatal", errorMsg);
}-*/;
private static native void reportWarning(String errorMsg)/*-{
$wnd.junitError("", errorMsg);
}-*/;
}
