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The Core Camel Java DSL based router
/**
* 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.impl;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedList;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.atomic.AtomicLong;
import org.apache.camel.Exchange;
import org.apache.camel.MessageHistory;
import org.apache.camel.NamedNode;
import org.apache.camel.processor.DefaultExchangeFormatter;
import org.apache.camel.spi.AsyncProcessorAwaitManager;
import org.apache.camel.spi.ExchangeFormatter;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.MessageHelper;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class DefaultAsyncProcessorAwaitManager extends ServiceSupport implements AsyncProcessorAwaitManager {
private static final Logger LOG = LoggerFactory.getLogger(DefaultAsyncProcessorAwaitManager.class);
private final AsyncProcessorAwaitManager.Statistics statistics = new UtilizationStatistics();
private final AtomicLong blockedCounter = new AtomicLong();
private final AtomicLong interruptedCounter = new AtomicLong();
private final AtomicLong totalDuration = new AtomicLong();
private final AtomicLong minDuration = new AtomicLong();
private final AtomicLong maxDuration = new AtomicLong();
private final AtomicLong meanDuration = new AtomicLong();
private final Map inflight = new ConcurrentHashMap();
private final ExchangeFormatter exchangeFormatter;
private boolean interruptThreadsWhileStopping = true;
public DefaultAsyncProcessorAwaitManager() {
// setup exchange formatter to be used for message history dump
DefaultExchangeFormatter formatter = new DefaultExchangeFormatter();
formatter.setShowExchangeId(true);
formatter.setMultiline(true);
formatter.setShowHeaders(true);
formatter.setStyle(DefaultExchangeFormatter.OutputStyle.Fixed);
this.exchangeFormatter = formatter;
}
@Override
public void await(Exchange exchange, CountDownLatch latch) {
LOG.trace("Waiting for asynchronous callback before continuing for exchangeId: {} -> {}",
exchange.getExchangeId(), exchange);
try {
if (statistics.isStatisticsEnabled()) {
blockedCounter.incrementAndGet();
}
inflight.put(exchange, new AwaitThreadEntry(Thread.currentThread(), exchange, latch));
latch.await();
LOG.trace("Asynchronous callback received, will continue routing exchangeId: {} -> {}",
exchange.getExchangeId(), exchange);
} catch (InterruptedException e) {
LOG.trace("Interrupted while waiting for callback, will continue routing exchangeId: {} -> {}",
exchange.getExchangeId(), exchange);
exchange.setException(e);
} finally {
AwaitThread thread = inflight.remove(exchange);
if (statistics.isStatisticsEnabled() && thread != null) {
long time = thread.getWaitDuration();
long total = totalDuration.get() + time;
totalDuration.set(total);
if (time < minDuration.get()) {
minDuration.set(time);
} else if (time > maxDuration.get()) {
maxDuration.set(time);
}
// update mean
long count = blockedCounter.get();
long mean = count > 0 ? total / count : 0;
meanDuration.set(mean);
}
}
}
@Override
public void countDown(Exchange exchange, CountDownLatch latch) {
LOG.trace("Asynchronous callback received for exchangeId: {}", exchange.getExchangeId());
latch.countDown();
}
@Override
public int size() {
return inflight.size();
}
@Override
public Collection browse() {
return Collections.unmodifiableCollection(inflight.values());
}
@Override
public void interrupt(String exchangeId) {
// need to find the exchange with the given exchange id
Exchange found = null;
for (AsyncProcessorAwaitManager.AwaitThread entry : browse()) {
Exchange exchange = entry.getExchange();
if (exchangeId.equals(exchange.getExchangeId())) {
found = exchange;
break;
}
}
if (found != null) {
interrupt(found);
}
}
@Override
public void interrupt(Exchange exchange) {
AwaitThreadEntry entry = (AwaitThreadEntry) inflight.get(exchange);
if (entry != null) {
try {
StringBuilder sb = new StringBuilder();
sb.append("Interrupted while waiting for asynchronous callback, will release the following blocked thread which was waiting for exchange to finish processing with exchangeId: ");
sb.append(exchange.getExchangeId());
sb.append("\n");
sb.append(dumpBlockedThread(entry));
// dump a route stack trace of the exchange
String routeStackTrace = MessageHelper.dumpMessageHistoryStacktrace(exchange, exchangeFormatter, false);
if (routeStackTrace != null) {
sb.append(routeStackTrace);
}
LOG.warn(sb.toString());
} catch (Exception e) {
throw ObjectHelper.wrapRuntimeCamelException(e);
} finally {
if (statistics.isStatisticsEnabled()) {
interruptedCounter.incrementAndGet();
}
exchange.setException(new RejectedExecutionException("Interrupted while waiting for asynchronous callback for exchangeId: " + exchange.getExchangeId()));
entry.getLatch().countDown();
}
}
}
public boolean isInterruptThreadsWhileStopping() {
return interruptThreadsWhileStopping;
}
public void setInterruptThreadsWhileStopping(boolean interruptThreadsWhileStopping) {
this.interruptThreadsWhileStopping = interruptThreadsWhileStopping;
}
public Statistics getStatistics() {
return statistics;
}
@Override
protected void doStart() throws Exception {
// noop
}
@Override
protected void doStop() throws Exception {
Collection threads = browse();
int count = threads.size();
if (count > 0) {
LOG.warn("Shutting down while there are still " + count + " inflight threads currently blocked.");
StringBuilder sb = new StringBuilder();
for (AwaitThread entry : threads) {
sb.append(dumpBlockedThread(entry));
}
if (isInterruptThreadsWhileStopping()) {
LOG.warn("The following threads are blocked and will be interrupted so the threads are released:\n" + sb.toString());
for (AwaitThread entry : threads) {
try {
interrupt(entry.getExchange());
} catch (Throwable e) {
LOG.warn("Error while interrupting thread: " + entry.getBlockedThread().getName() + ". This exception is ignored.", e);
}
}
} else {
LOG.warn("The following threads are blocked, and may reside in the JVM:\n" + sb.toString());
}
} else {
LOG.debug("Shutting down with no inflight threads.");
}
inflight.clear();
}
private static String dumpBlockedThread(AwaitThread entry) {
StringBuilder sb = new StringBuilder();
sb.append("\n");
sb.append("Blocked Thread\n");
sb.append("---------------------------------------------------------------------------------------------------------------------------------------\n");
sb.append(style("Id:")).append(entry.getBlockedThread().getId()).append("\n");
sb.append(style("Name:")).append(entry.getBlockedThread().getName()).append("\n");
sb.append(style("RouteId:")).append(safeNull(entry.getRouteId())).append("\n");
sb.append(style("NodeId:")).append(safeNull(entry.getNodeId())).append("\n");
sb.append(style("Duration:")).append(entry.getWaitDuration()).append(" msec.\n");
return sb.toString();
}
private static String style(String label) {
return String.format("\t%-20s", label);
}
private static String safeNull(Object value) {
return value != null ? value.toString() : "";
}
private static final class AwaitThreadEntry implements AwaitThread {
private final Thread thread;
private final Exchange exchange;
private final CountDownLatch latch;
private final long start;
private AwaitThreadEntry(Thread thread, Exchange exchange, CountDownLatch latch) {
this.thread = thread;
this.exchange = exchange;
this.latch = latch;
this.start = System.currentTimeMillis();
}
@Override
public Thread getBlockedThread() {
return thread;
}
@Override
public Exchange getExchange() {
return exchange;
}
@Override
public long getWaitDuration() {
return System.currentTimeMillis() - start;
}
@Override
public String getRouteId() {
MessageHistory lastMessageHistory = getLastMessageHistory();
if (lastMessageHistory == null) {
return null;
}
return lastMessageHistory.getRouteId();
}
@Override
public String getNodeId() {
NamedNode node = getNode();
if (node == null) {
return null;
}
return node.getId();
}
public CountDownLatch getLatch() {
return latch;
}
private NamedNode getNode() {
MessageHistory lastMessageHistory = getLastMessageHistory();
if (lastMessageHistory == null) {
return null;
}
return lastMessageHistory.getNode();
}
private MessageHistory getLastMessageHistory() {
LinkedList list = getMessageHistories();
if (list == null || list.isEmpty()) {
return null;
}
return list.getLast();
}
private LinkedList getMessageHistories() {
return exchange.getProperty(Exchange.MESSAGE_HISTORY, LinkedList.class);
}
@Override
public String toString() {
return "AwaitThreadEntry[name=" + thread.getName() + ", exchangeId=" + exchange.getExchangeId() + "]";
}
}
/**
* Represents utilization statistics
*/
private final class UtilizationStatistics implements AsyncProcessorAwaitManager.Statistics {
private boolean statisticsEnabled;
@Override
public long getThreadsBlocked() {
return blockedCounter.get();
}
@Override
public long getThreadsInterrupted() {
return interruptedCounter.get();
}
@Override
public long getTotalDuration() {
return totalDuration.get();
}
@Override
public long getMinDuration() {
return minDuration.get();
}
@Override
public long getMaxDuration() {
return maxDuration.get();
}
@Override
public long getMeanDuration() {
return meanDuration.get();
}
@Override
public void reset() {
blockedCounter.set(0);
interruptedCounter.set(0);
totalDuration.set(0);
minDuration.set(0);
maxDuration.set(0);
meanDuration.set(0);
}
@Override
public boolean isStatisticsEnabled() {
return statisticsEnabled;
}
@Override
public void setStatisticsEnabled(boolean statisticsEnabled) {
this.statisticsEnabled = statisticsEnabled;
}
@Override
public String toString() {
return String.format("AsyncProcessAwaitManager utilization[blocked=%s, interrupted=%s, total=%s min=%s, max=%s, mean=%s]",
getThreadsBlocked(), getThreadsInterrupted(), getTotalDuration(), getMinDuration(), getMaxDuration(), getMeanDuration());
}
}
}