/*
* Copyright 2012 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.launcher.daemon.server;
import org.gradle.api.logging.Logger;
import org.gradle.api.logging.Logging;
import org.gradle.internal.UncheckedException;
import org.gradle.internal.concurrent.ExecutorFactory;
import org.gradle.internal.concurrent.Stoppable;
import org.gradle.internal.concurrent.StoppableExecutor;
import org.gradle.launcher.daemon.context.DaemonContext;
import org.gradle.launcher.daemon.logging.DaemonMessages;
import org.gradle.launcher.daemon.protocol.Command;
import org.gradle.launcher.daemon.protocol.DaemonFailure;
import org.gradle.launcher.daemon.server.exec.DaemonCommandExecuter;
import org.gradle.launcher.daemon.server.api.DaemonConnection;
import org.gradle.launcher.daemon.server.api.DaemonStateControl;
import org.gradle.messaging.remote.internal.Connection;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class DefaultIncomingConnectionHandler implements IncomingConnectionHandler, Stoppable {
private static final Logger LOGGER = Logging.getLogger(DefaultIncomingConnectionHandler.class);
private final StoppableExecutor workers;
private final DaemonContext daemonContext;
private final DaemonCommandExecuter commandExecuter;
private final DaemonStateControl daemonStateControl;
private final ExecutorFactory executorFactory;
private final Lock lock = new ReentrantLock();
private final Condition condition = lock.newCondition();
private final Set<Connection<?>> inProgress = new HashSet<Connection<?>>();
public DefaultIncomingConnectionHandler(DaemonCommandExecuter commandExecuter, DaemonContext daemonContext, DaemonStateControl daemonStateControl, ExecutorFactory executorFactory) {
this.commandExecuter = commandExecuter;
this.daemonContext = daemonContext;
this.daemonStateControl = daemonStateControl;
this.executorFactory = executorFactory;
workers = executorFactory.create("Daemon");
}
public void handle(final Connection<Object> connection) {
// Mark the connection has being handled
onStartHandling(connection);
//we're spinning a thread to do work to avoid blocking the connection
//This means that the Daemon potentially can do multiple things but we only allows a single build at a time
workers.execute(new ConnectionWorker(connection));
}
private void onStartHandling(Connection<Object> connection) {
lock.lock();
try {
inProgress.add(connection);
} finally {
lock.unlock();
}
}
private void onFinishHandling(Connection<Object> connection) {
lock.lock();
try {
inProgress.remove(connection);
condition.signalAll();
} finally {
lock.unlock();
}
}
/**
* Blocks until all connections have been handled or abandoned.
*/
public void stop() {
lock.lock();
try {
while (!inProgress.isEmpty()) {
try {
condition.await();
} catch (InterruptedException e) {
throw UncheckedException.throwAsUncheckedException(e);
}
}
} finally {
lock.unlock();
}
}
private class ConnectionWorker implements Runnable {
private final Connection<Object> connection;
public ConnectionWorker(Connection<Object> connection) {
this.connection = connection;
}
public void run() {
try {
receiveAndHandleCommand();
} finally {
onFinishHandling(connection);
}
}
private void receiveAndHandleCommand() {
try {
DefaultDaemonConnection daemonConnection = new DefaultDaemonConnection(connection, executorFactory);
try {
Command command = receiveCommand(daemonConnection);
if (command != null) {
handleCommand(command, daemonConnection);
}
} finally {
daemonConnection.stop();
}
} finally {
connection.stop();
}
}
private Command receiveCommand(DaemonConnection daemonConnection) {
try {
Command command = (Command) daemonConnection.receive(120, TimeUnit.SECONDS);
LOGGER.info("Received command: {}.", command);
return command;
} catch (Throwable e) {
LOGGER.warn(String.format("Unable to receive command from %s. Dispatching the failure to the daemon client", connection), e);
daemonConnection.completed(new DaemonFailure(e));
return null;
}
}
private void handleCommand(Command command, DaemonConnection daemonConnection) {
LOGGER.debug(DaemonMessages.STARTED_EXECUTING_COMMAND + command + " with connection: " + connection + ".");
try {
commandExecuter.executeCommand(daemonConnection, command, daemonContext, daemonStateControl);
} catch (Throwable e) {
LOGGER.warn(String.format("Unable to execute command %s from %s. Dispatching the failure to the daemon client", command, connection), e);
daemonConnection.completed(new DaemonFailure(e));
} finally {
LOGGER.debug(DaemonMessages.FINISHED_EXECUTING_COMMAND + command);
}
Object finished = daemonConnection.receive(60, TimeUnit.SECONDS);
LOGGER.debug("Received finished message: {}", finished);
}
}
}