001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.component.directvm;
018
019import org.apache.camel.AsyncCallback;
020import org.apache.camel.Exchange;
021import org.apache.camel.Message;
022import org.apache.camel.impl.DefaultAsyncProducer;
023import org.apache.camel.spi.HeaderFilterStrategy;
024
025/**
026 * The Direct-VM producer.
027 */
028public class DirectVmProducer extends DefaultAsyncProducer {
029
030    private DirectVmEndpoint endpoint;
031
032    public DirectVmProducer(DirectVmEndpoint endpoint) {
033        super(endpoint);
034        this.endpoint = endpoint;
035    }
036
037    @Override
038    public boolean process(Exchange exchange, AsyncCallback callback) {
039        // send to consumer
040        DirectVmConsumer consumer = endpoint.getComponent().getConsumer(endpoint);
041        
042        if (consumer == null) {
043            if (endpoint.isFailIfNoConsumers()) {
044                exchange.setException(new DirectVmConsumerNotAvailableException("No consumers available on endpoint: " + endpoint, exchange));
045            } else {
046                log.debug("message ignored, no consumers available on endpoint: {}", endpoint);
047            }
048            callback.done(true);
049            return true;
050        }
051        
052        final HeaderFilterStrategy headerFilterStrategy = endpoint.getHeaderFilterStrategy();
053
054        // Only clone the Exchange if we actually need to filter out properties or headers.
055        final Exchange submitted = (!endpoint.isPropagateProperties() || headerFilterStrategy != null) ? exchange.copy(true) : exchange;
056
057        // Clear properties in the copy if we are not propagating them.
058        if (!endpoint.isPropagateProperties()) {
059            submitted.getProperties().clear();
060        }
061        
062        // Filter headers by Header Filter Strategy if there is one set.
063        if (headerFilterStrategy != null) {
064            submitted.getIn().getHeaders().entrySet().removeIf(e -> headerFilterStrategy.applyFilterToCamelHeaders(e.getKey(), e.getValue(), submitted));
065        }
066        
067        return consumer.getAsyncProcessor().process(submitted, done -> {
068            Message msg = submitted.hasOut() ? submitted.getOut() : submitted.getIn();
069
070            if (headerFilterStrategy != null) {
071                msg.getHeaders().entrySet().removeIf(e -> headerFilterStrategy.applyFilterToExternalHeaders(e.getKey(), e.getValue(), submitted));
072            }
073
074            if (exchange != submitted) {
075                // only need to copy back if they are different
076                exchange.setException(submitted.getException());
077                exchange.getOut().copyFrom(msg);
078            }
079
080            if (endpoint.isPropagateProperties()) {
081                exchange.getProperties().putAll(submitted.getProperties());
082            }
083
084            callback.done(done);
085        });
086    }
087    
088}