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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.processor;
import org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.AsyncProducerCallback;
import org.apache.camel.CamelContext;
import org.apache.camel.CamelContextAware;
import org.apache.camel.Endpoint;
import org.apache.camel.Exchange;
import org.apache.camel.ExchangePattern;
import org.apache.camel.Expression;
import org.apache.camel.NoTypeConversionAvailableException;
import org.apache.camel.Producer;
import org.apache.camel.impl.EmptyProducerCache;
import org.apache.camel.impl.ProducerCache;
import org.apache.camel.spi.EndpointUtilizationStatistics;
import org.apache.camel.spi.IdAware;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.AsyncProcessorHelper;
import org.apache.camel.util.EndpointHelper;
import org.apache.camel.util.ExchangeHelper;
import org.apache.camel.util.ServiceHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Processor for forwarding exchanges to a dynamic endpoint destination.
*
* @see org.apache.camel.processor.SendProcessor
*/
public class SendDynamicProcessor extends ServiceSupport implements AsyncProcessor, IdAware, CamelContextAware {
protected static final Logger LOG = LoggerFactory.getLogger(SendDynamicProcessor.class);
protected CamelContext camelContext;
protected final String uri;
protected final Expression expression;
protected ExchangePattern pattern;
protected ProducerCache producerCache;
protected String id;
protected boolean ignoreInvalidEndpoint;
protected int cacheSize;
public SendDynamicProcessor(Expression expression) {
this.uri = null;
this.expression = expression;
}
public SendDynamicProcessor(String uri, Expression expression) {
this.uri = uri;
this.expression = expression;
}
@Override
public String toString() {
return "sendTo(" + getExpression() + ")";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public void process(final Exchange exchange) throws Exception {
AsyncProcessorHelper.process(this, exchange);
}
public boolean process(Exchange exchange, final AsyncCallback callback) {
if (!isStarted()) {
exchange.setException(new IllegalStateException("SendProcessor has not been started: " + this));
callback.done(true);
return true;
}
// we should preserve existing MEP so remember old MEP
// if you want to permanently to change the MEP then use .setExchangePattern in the DSL
final ExchangePattern existingPattern = exchange.getPattern();
// which endpoint to send to
final Endpoint endpoint;
final ExchangePattern destinationExchangePattern;
// use dynamic endpoint so calculate the endpoint to use
Object recipient = null;
try {
recipient = expression.evaluate(exchange, Object.class);
endpoint = resolveEndpoint(exchange, recipient);
if (endpoint == null) {
if (LOG.isDebugEnabled()) {
LOG.debug("Send dynamic evaluated as null so cannot send to any endpoint");
}
// no endpoint to send to, so ignore
callback.done(true);
return true;
}
destinationExchangePattern = EndpointHelper.resolveExchangePatternFromUrl(endpoint.getEndpointUri());
} catch (Throwable e) {
if (isIgnoreInvalidEndpoint()) {
if (LOG.isDebugEnabled()) {
LOG.debug("Endpoint uri is invalid: " + recipient + ". This exception will be ignored.", e);
}
} else {
exchange.setException(e);
}
callback.done(true);
return true;
}
// send the exchange to the destination using the producer cache
return producerCache.doInAsyncProducer(endpoint, exchange, pattern, callback, new AsyncProducerCallback() {
public boolean doInAsyncProducer(Producer producer, AsyncProcessor asyncProducer, final Exchange exchange,
ExchangePattern pattern, final AsyncCallback callback) {
final Exchange target = configureExchange(exchange, pattern, destinationExchangePattern, endpoint);
LOG.debug(">>>> {} {}", endpoint, exchange);
return asyncProducer.process(target, new AsyncCallback() {
public void done(boolean doneSync) {
// restore previous MEP
target.setPattern(existingPattern);
// signal we are done
callback.done(doneSync);
}
});
}
});
}
protected static Endpoint resolveEndpoint(Exchange exchange, Object recipient) throws NoTypeConversionAvailableException {
// trim strings as end users might have added spaces between separators
if (recipient instanceof String) {
recipient = ((String) recipient).trim();
} else if (recipient instanceof Endpoint) {
return (Endpoint) recipient;
} else if (recipient != null) {
// convert to a string type we can work with
recipient = exchange.getContext().getTypeConverter().mandatoryConvertTo(String.class, exchange, recipient);
}
if (recipient != null) {
return ExchangeHelper.resolveEndpoint(exchange, recipient);
} else {
return null;
}
}
protected Exchange configureExchange(Exchange exchange, ExchangePattern pattern, ExchangePattern destinationExchangePattern, Endpoint endpoint) {
// destination exchange pattern overrides pattern
if (destinationExchangePattern != null) {
exchange.setPattern(destinationExchangePattern);
} else if (pattern != null) {
exchange.setPattern(pattern);
}
// set property which endpoint we send to
exchange.setProperty(Exchange.TO_ENDPOINT, endpoint.getEndpointUri());
return exchange;
}
protected void doStart() throws Exception {
if (producerCache == null) {
if (cacheSize < 0) {
producerCache = new EmptyProducerCache(this, camelContext);
LOG.debug("DynamicSendTo {} is not using ProducerCache", this);
} else if (cacheSize == 0) {
producerCache = new ProducerCache(this, camelContext);
LOG.debug("DynamicSendTo {} using ProducerCache with default cache size", this);
} else {
producerCache = new ProducerCache(this, camelContext, cacheSize);
LOG.debug("DynamicSendTo {} using ProducerCache with cacheSize={}", this, cacheSize);
}
}
ServiceHelper.startService(producerCache);
}
protected void doStop() throws Exception {
ServiceHelper.stopServices(producerCache);
}
public EndpointUtilizationStatistics getEndpointUtilizationStatistics() {
return producerCache.getEndpointUtilizationStatistics();
}
public CamelContext getCamelContext() {
return camelContext;
}
public void setCamelContext(CamelContext camelContext) {
this.camelContext = camelContext;
}
public String getUri() {
return uri;
}
public Expression getExpression() {
return expression;
}
public ExchangePattern getPattern() {
return pattern;
}
public void setPattern(ExchangePattern pattern) {
this.pattern = pattern;
}
public boolean isIgnoreInvalidEndpoint() {
return ignoreInvalidEndpoint;
}
public void setIgnoreInvalidEndpoint(boolean ignoreInvalidEndpoint) {
this.ignoreInvalidEndpoint = ignoreInvalidEndpoint;
}
public int getCacheSize() {
return cacheSize;
}
public void setCacheSize(int cacheSize) {
this.cacheSize = cacheSize;
}
}