/*
* Copyright (c) 2014 Spotify AB.
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.spotify.helios.agent;
import com.spotify.helios.common.LoggingConfig;
import com.spotify.helios.servicescommon.ServiceMain;
import net.sourceforge.argparse4j.inf.ArgumentParserException;
import sun.misc.Signal;
import sun.misc.SignalHandler;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicReference;
/**
* Instantiates and runs helios agent.
*/
public class AgentMain extends ServiceMain {
private final AgentConfig agentConfig;
private AgentService service;
public AgentMain(final String... args) throws ArgumentParserException {
this(new AgentParser(args));
}
public AgentMain(final AgentParser parser) {
this(parser.getAgentConfig(), parser.getLoggingConfig());
}
public AgentMain(final AgentConfig agentConfig, final LoggingConfig loggingConfig) {
super(loggingConfig, agentConfig.getSentryDsn());
this.agentConfig = agentConfig;
}
@Override
protected void startUp() throws Exception {
service = new AgentService(agentConfig, createEnvironment("helios-agent"));
service.startAsync().awaitRunning();
}
@Override
protected void shutDown() throws Exception {
if (service != null) {
service.stopAsync().awaitTerminated();
}
}
public static void main(final String... args) {
final AgentMain main;
final AtomicBoolean exitSignalTriggered = new AtomicBoolean(false);
final AtomicReference<SignalHandler> existingExitHandler =
new AtomicReference<SignalHandler>(null);
final SignalHandler handler = new SignalHandler() {
@Override
public void handle(Signal signal) {
if (exitSignalTriggered.get()) {
System.err.println("Exiting with extreme prejudice due to " + signal);
// Really exit
Runtime.getRuntime().halt(0);
} else {
System.err.println("Attempting gentle exit on " + signal);
exitSignalTriggered.set(true);
existingExitHandler.get().handle(signal);
}
}
};
existingExitHandler.set(Signal.handle(new Signal("INT"), handler));
Signal.handle(new Signal("TERM"), handler);
try {
main = new AgentMain(args);
} catch (ArgumentParserException e) {
e.printStackTrace();
System.exit(1);
return; // never get here, but this lets java know for sure we won't continue
}
try {
main.startAsync().awaitRunning();
main.awaitTerminated();
} catch (Throwable e) {
try {
main.shutDown();
} catch (Exception e1) {
System.err.println("Error shutting down");
e1.printStackTrace();
System.err.println("Originating exception follows");
}
e.printStackTrace();
System.exit(1);
}
// Ensure we exit even if there's lingering non-daemon threads
System.exit(0);
}
}