com.google.gwt.dev.codeserver.JobRunner Maven / Gradle / Ivy
/*
* Copyright 2014 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.dev.codeserver;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.TreeLogger.Type;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.dev.MinimalRebuildCacheManager;
import com.google.gwt.dev.javac.UnitCacheSingleton;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
/**
* Executes requests to compile modules using Super Dev Mode.
*
* Guarantees that only one thread invokes the GWT compiler at a time and reports
* progress on waiting jobs.
*
*
JobRunners are thread-safe.
*/
public class JobRunner {
private final JobEventTable table;
private final MinimalRebuildCacheManager minimalRebuildCacheManager;
private final ExecutorService executor = Executors.newSingleThreadExecutor();
JobRunner(JobEventTable table, MinimalRebuildCacheManager minimalRebuildCacheManager) {
this.table = table;
this.minimalRebuildCacheManager = minimalRebuildCacheManager;
}
/**
* Submits a cleaner job to be executed. (Waits for completion.)
*/
void clean(TreeLogger logger) throws ExecutionException {
try {
TreeLogger branch = logger.branch(TreeLogger.INFO, "Cleaning disk caches.");
executor.submit(new CleanerJob(branch)).get();
} catch (InterruptedException e) {
// Allow the JVM to shutdown.
}
}
/**
* Submits a recompile js creation job to be executed. (Waits for completion and returns JS.).
*/
public String getRecompileJs(final TreeLogger logger, final Outbox box)
throws ExecutionException {
try {
return executor.submit(new Callable() {
@Override
public String call() throws Exception {
return box.getRecompileJs(logger);
}
}).get();
} catch (InterruptedException e) {
// Allow the JVM to shutdown.
return null;
}
}
/**
* Submits a job to be executed. (Returns immediately.)
*/
synchronized void submit(final Job job) {
if (table.wasSubmitted(job)) {
throw new IllegalStateException("job already submitted: " + job.getId());
}
job.onSubmitted(table);
executor.submit(new Runnable() {
@Override
public void run() {
try {
recompile(job);
} catch (Throwable t) {
// Try to release the job so the HTTP request will return an error.
// (But this might not work if the same exception is thrown while
// sending the finished event.)
if (!job.isDone()) {
try {
job.onFinished(new Job.Result(null, null, t));
return;
} catch (Throwable t2) {
// fall through and log original exception
}
}
// Assume everything is broken. Last-ditch attempt to report the error.
t.printStackTrace();
}
}
});
job.getLogger().log(Type.TRACE, "added job to queue");
}
private static void recompile(Job job) {
job.getLogger().log(Type.INFO, "starting job: " + job.getId());
job.getOutbox().recompile(job);
}
/**
* A callable for clearing both unit and minimalRebuild caches.
*
* By packaging it as a callable and running it in the ExecutorService any danger of clearing
* caches at the same time as an active compile job is avoided.
*/
private class CleanerJob implements Callable {
private TreeLogger logger;
public CleanerJob(TreeLogger logger) {
this.logger = logger;
}
@Override
public Void call() throws UnableToCompleteException {
long beforeMs = System.nanoTime() / 1000000L;
minimalRebuildCacheManager.deleteCaches();
UnitCacheSingleton.clearCache();
long afterMs = System.nanoTime() / 1000000L;
logger.log(TreeLogger.INFO, String.format("Cleaned in %sms.", (afterMs - beforeMs)));
return null;
}
}
}