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/*
* 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 org.apache.camel.main;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import org.apache.camel.CamelContext;
import org.apache.camel.spi.CamelEvent;
import org.apache.camel.spi.CamelEvent.ExchangeCompletedEvent;
import org.apache.camel.spi.CamelEvent.ExchangeCreatedEvent;
import org.apache.camel.spi.CamelEvent.ExchangeFailedEvent;
import org.apache.camel.spi.CamelEvent.RouteReloadedEvent;
import org.apache.camel.support.EventNotifierSupport;
import org.apache.camel.util.StopWatch;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A {@link org.apache.camel.spi.EventNotifier} to trigger (shutdown of the Main JVM, or stopping all routes) when
* maximum number of messages has been processed.
*/
public class MainDurationEventNotifier extends EventNotifierSupport {
private static final Logger LOG = LoggerFactory.getLogger(MainLifecycleStrategy.class);
private final CamelContext camelContext;
private final int maxMessages;
private final long maxIdleSeconds;
private final MainShutdownStrategy shutdownStrategy;
private final boolean stopCamelContext;
private final boolean restartDuration;
private final String action;
private final AtomicInteger doneMessages;
private volatile StopWatch watch;
private volatile ScheduledExecutorService idleExecutorService;
public MainDurationEventNotifier(CamelContext camelContext, int maxMessages, long maxIdleSeconds,
MainShutdownStrategy shutdownStrategy, boolean stopCamelContext,
boolean restartDuration, String action) {
this.camelContext = camelContext;
this.maxMessages = maxMessages;
this.maxIdleSeconds = maxIdleSeconds;
this.shutdownStrategy = shutdownStrategy;
this.stopCamelContext = stopCamelContext;
this.restartDuration = restartDuration;
this.action = action.toLowerCase();
this.doneMessages = new AtomicInteger();
}
@Override
public void notify(CamelEvent event) throws Exception {
try {
doNotify(event);
} catch (Exception e) {
LOG.warn("Error during processing CamelEvent: " + event + ". This exception is ignored.", e);
}
}
protected void doNotify(CamelEvent event) throws Exception {
// ignore any event that is received if shutdown is in process
if (!shutdownStrategy.isRunAllowed()) {
return;
}
boolean begin = event instanceof ExchangeCreatedEvent;
boolean complete = event instanceof ExchangeCompletedEvent || event instanceof ExchangeFailedEvent;
boolean reloaded = event instanceof RouteReloadedEvent;
if (reloaded) {
if (restartDuration) {
LOG.debug("Routes reloaded. Resetting maxMessages/maxIdleSeconds/maxSeconds");
shutdownStrategy.restartAwait();
doneMessages.set(0);
if (watch != null) {
watch.restart();
}
}
return;
}
if (maxMessages > 0 && complete) {
boolean result = doneMessages.incrementAndGet() >= maxMessages;
LOG.trace("Duration max messages check {} >= {} -> {}", doneMessages.get(), maxMessages, result);
if (result && shutdownStrategy.isRunAllowed()) {
if ("shutdown".equalsIgnoreCase(action)) {
LOG.info("Duration max messages triggering shutdown of the JVM");
// use thread to shutdown Camel as otherwise we would block current thread
camelContext.getExecutorServiceManager().newThread("CamelMainShutdownCamelContext", this::shutdownTask)
.start();
} else if ("stop".equalsIgnoreCase(action)) {
LOG.info("Duration max messages triggering stopping all routes");
// use thread to stop routes as otherwise we would block current thread
camelContext.getExecutorServiceManager().newThread("CamelMainShutdownCamelContext", this::stopTask).start();
}
}
}
// idle reacts on both incoming and complete messages
if (maxIdleSeconds > 0 && (begin || complete)) {
if (watch != null) {
LOG.trace("Message activity so restarting stop watch");
watch.restart();
}
}
}
@Override
public boolean isEnabled(CamelEvent event) {
return event instanceof ExchangeCreatedEvent || event instanceof ExchangeCompletedEvent
|| event instanceof ExchangeFailedEvent || event instanceof RouteReloadedEvent;
}
@Override
public String toString() {
return "MainDurationEventNotifier[" + maxMessages + " max messages]";
}
@Override
protected void doInit() throws Exception {
super.doInit();
if (!action.equals("shutdown") && !action.equals("stop")) {
throw new IllegalArgumentException("Unknown action: " + action);
}
}
@Override
protected void doStart() throws Exception {
if (maxIdleSeconds > 0) {
// we only start watch when Camel is started
camelContext.addStartupListener((context, alreadyStarted) -> watch = new StopWatch());
// okay we need to trigger on idle after X period, and therefore we need a background task that checks this
idleExecutorService = Executors.newSingleThreadScheduledExecutor();
idleExecutorService.scheduleAtFixedRate(this::idleTask, 1, 1, TimeUnit.SECONDS);
}
}
private void stopTask() {
// don't run the task if shutdown is in process
if (!shutdownStrategy.isRunAllowed()) {
return;
}
try {
camelContext.getRouteController().stopAllRoutes();
} catch (Exception e) {
LOG.warn("Error during stopping all routes. This exception is ignored.", e);
}
}
private void shutdownTask() {
// don't run the task if shutdown is in process
if (!shutdownStrategy.isRunAllowed()) {
return;
}
// shutdown idle checker if in use as we are stopping
if (idleExecutorService != null) {
idleExecutorService.shutdownNow();
}
try {
// shutting down CamelContext
if (stopCamelContext) {
camelContext.stop();
}
} catch (Exception e) {
LOG.warn("Error during stopping CamelContext. This exception is ignored.", e);
} finally {
// trigger stopping the Main
shutdownStrategy.shutdown();
}
}
private void idleTask() {
// don't run the task if shutdown is in process
if (!shutdownStrategy.isRunAllowed()) {
return;
}
if (watch == null) {
// camel has not been started yet
return;
}
// any inflight messages currently
int inflight = camelContext.getInflightRepository().size();
if (inflight > 0) {
LOG.trace("Duration max idle check is skipped due {} inflight messages", inflight);
return;
}
long seconds = watch.taken() / 1000;
boolean result = seconds >= maxIdleSeconds;
LOG.trace("Duration max idle check {} >= {} -> {}", seconds, maxIdleSeconds, result);
if (result && shutdownStrategy.isRunAllowed()) {
if ("shutdown".equals(action)) {
LOG.info("Duration max idle triggering shutdown of the JVM");
// use thread to stop Camel as otherwise we would block current thread
camelContext.getExecutorServiceManager().newThread("CamelMainShutdownCamelContext", this::shutdownTask).start();
} else if ("stop".equals(action)) {
LOG.info("Duration max idle triggering stopping all routes");
// use thread to stop Camel as otherwise we would block current thread
camelContext.getExecutorServiceManager().newThread("CamelMainShutdownCamelContext", this::stopTask).start();
}
}
}
}
