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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.support.processor;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CompletableFuture;

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.AsyncCallbackToCompletableFutureAdapter;
import org.apache.camel.support.service.ServiceHelper;
import org.apache.camel.support.service.ServiceSupport;

/**
 * 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. * @see DelegateAsyncProcessor * @see 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 + "]"; } @Override 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(false); } return false; } @Override public CompletableFuture processAsync(Exchange exchange) { AsyncCallbackToCompletableFutureAdapter callback = new AsyncCallbackToCompletableFutureAdapter<>(exchange); process(exchange, callback); return callback.getFuture(); } @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.stopService(processor); } }





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