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/*
* Copyright 2016 the original author or authors.
*
* 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 org.gradle.process.internal.worker;
import org.gradle.api.logging.Logger;
import org.gradle.api.logging.Logging;
import org.gradle.internal.UncheckedException;
import org.gradle.internal.concurrent.AsyncStoppable;
import org.gradle.internal.concurrent.CompositeStoppable;
import org.gradle.internal.concurrent.Stoppable;
import org.gradle.internal.remote.ConnectionAcceptor;
import org.gradle.internal.remote.ObjectConnection;
import org.gradle.process.ExecResult;
import org.gradle.process.internal.ExecException;
import org.gradle.process.internal.ExecHandle;
import org.gradle.process.internal.ExecHandleListener;
import org.gradle.process.internal.health.memory.JvmMemoryStatus;
import javax.annotation.Nullable;
import java.util.Date;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
import static java.lang.String.format;
public class DefaultWorkerProcess implements WorkerProcess {
private final static Logger LOGGER = Logging.getLogger(DefaultWorkerProcess.class);
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
private ObjectConnection connection;
private ConnectionAcceptor acceptor;
private ExecHandle execHandle;
private boolean running;
private boolean aborted;
private Throwable processFailure;
private final long connectTimeout;
private final JvmMemoryStatus jvmMemoryStatus;
public DefaultWorkerProcess(int connectTimeoutValue, TimeUnit connectTimeoutUnits, @Nullable JvmMemoryStatus jvmMemoryStatus) {
connectTimeout = connectTimeoutUnits.toMillis(connectTimeoutValue);
this.jvmMemoryStatus = jvmMemoryStatus;
}
@Override
public JvmMemoryStatus getJvmMemoryStatus() {
if (jvmMemoryStatus != null) {
return jvmMemoryStatus;
} else {
throw new UnsupportedOperationException("This worker process does not support reporting JVM memory status.");
}
}
@Override
public void stopNow() {
lock.lock();
try {
aborted = true;
if (connection != null) {
connection.abort();
}
} finally {
lock.unlock();
// cleanup() will abort the process as desired
cleanup();
}
}
public void setExecHandle(ExecHandle execHandle) {
this.execHandle = execHandle;
execHandle.addListener(new ExecHandleListener() {
@Override
public void executionStarted(ExecHandle execHandle) {
}
@Override
public void executionFinished(ExecHandle execHandle, ExecResult execResult) {
onProcessStop(execResult);
}
});
}
public void startAccepting(ConnectionAcceptor acceptor) {
lock.lock();
try {
this.acceptor = acceptor;
} finally {
lock.unlock();
}
}
public void onConnect(ObjectConnection connection) {
onConnect(connection, null);
}
public void onConnect(ObjectConnection connection, Runnable connectionHandler) {
AsyncStoppable stoppable;
lock.lock();
try {
LOGGER.debug("Received connection {} from {}", connection, execHandle);
if (connectionHandler != null && running) {
connectionHandler.run();
}
this.connection = connection;
if (aborted) {
connection.abort();
}
condition.signalAll();
stoppable = acceptor;
} finally {
lock.unlock();
}
if (stoppable != null) {
stoppable.requestStop();
}
}
private void onProcessStop(ExecResult execResult) {
lock.lock();
try {
try {
execResult.rethrowFailure().assertNormalExitValue();
} catch (Throwable e) {
processFailure = e;
}
running = false;
condition.signalAll();
} finally {
lock.unlock();
}
}
@Override
public String toString() {
return "DefaultWorkerProcess{"
+ "running=" + running
+ ", execHandle=" + execHandle
+ '}';
}
@Override
public ObjectConnection getConnection() {
return connection;
}
@Override
public WorkerProcess start() {
try {
doStart();
} catch (Throwable t) {
cleanup();
throw UncheckedException.throwAsUncheckedException(t);
}
return this;
}
private void doStart() {
lock.lock();
try {
running = true;
} finally {
lock.unlock();
}
execHandle.start();
Date connectExpiry = new Date(System.currentTimeMillis() + connectTimeout);
lock.lock();
try {
while (connection == null && running) {
try {
if (!condition.awaitUntil(connectExpiry)) {
throw new ExecException(format("Unable to connect to the child process '%s'.\n"
+ "It is likely that the child process have crashed - please find the stack trace in the build log.\n"
+ "This exception might occur when the build machine is extremely loaded.\n"
+ "The connection attempt hit a timeout after %.1f seconds (last known process state: %s, running: %s).", execHandle, ((double) connectTimeout) / 1000, execHandle.getState(), running));
}
} catch (InterruptedException e) {
throw UncheckedException.throwAsUncheckedException(e);
}
}
if (connection == null) {
if (processFailure != null) {
throw UncheckedException.throwAsUncheckedException(processFailure);
} else {
throw new ExecException(format("Never received a connection from %s.", execHandle));
}
}
} finally {
lock.unlock();
}
}
@Override
public ExecResult waitForStop() {
try {
return execHandle.waitForFinish().assertNormalExitValue();
} finally {
cleanup();
}
}
private void cleanup() {
CompositeStoppable stoppable;
lock.lock();
try {
stoppable = CompositeStoppable.stoppable(connection, new Stoppable() {
@Override
public void stop() {
execHandle.abort();
}
}, acceptor);
} finally {
this.connection = null;
this.acceptor = null;
lock.unlock();
}
stoppable.stop();
}
}