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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 java.util.ArrayList;
import java.util.List;
import org.apache.camel.AsyncCallback;
import org.apache.camel.AsyncProcessor;
import org.apache.camel.Exchange;
import org.apache.camel.Navigate;
import org.apache.camel.Processor;
import org.apache.camel.support.ServiceSupport;
import org.apache.camel.util.ServiceHelper;
/**
* A Delegate pattern which delegates synchronous processing to a nested {@link org.apache.camel.Processor} which can
* be useful for implementation inheritance when writing an {@link org.apache.camel.spi.Policy}
*
* Important: This implementation does support the asynchronous routing engine, only.
* if the logic in the {@link #process(org.apache.camel.Exchange)} does not invoke EIPs; as it forces using
* synchronous processing during the {@link #process(org.apache.camel.Exchange)} method call.
* If you are implementing a EIP pattern please use this as the delegate, for simple EIPs.
*
* @version
* @see DelegateAsyncProcessor
* @see org.apache.camel.processor.DelegateProcessor
*/
public class DelegateSyncProcessor extends ServiceSupport implements org.apache.camel.DelegateProcessor, AsyncProcessor, Navigate {
protected Processor processor;
public DelegateSyncProcessor(Processor processor) {
this.processor = processor;
}
@Override
public String toString() {
return "DelegateSync[" + processor + "]";
}
public Processor getProcessor() {
return processor;
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
// force calling the sync method
try {
processor.process(exchange);
} catch (Throwable e) {
// must catch throwable so we catch all
exchange.setException(e);
} finally {
// we are bridging a sync processor as async so callback with true
callback.done(true);
}
return true;
}
@Override
public void process(Exchange exchange) throws Exception {
processor.process(exchange);
}
@Override
public boolean hasNext() {
return processor != null;
}
@Override
public List next() {
if (!hasNext()) {
return null;
}
List answer = new ArrayList<>(1);
answer.add(processor);
return answer;
}
@Override
protected void doStart() throws Exception {
ServiceHelper.startService(processor);
}
@Override
protected void doStop() throws Exception {
ServiceHelper.stopServices(processor);
}
}