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 java.util.ArrayList;
020import java.util.Collection;
021import java.util.Map;
022import java.util.concurrent.ConcurrentHashMap;
023import java.util.concurrent.ConcurrentMap;
024import java.util.concurrent.atomic.AtomicInteger;
025
026import org.apache.camel.Endpoint;
027import org.apache.camel.impl.UriEndpointComponent;
028
029/**
030 * Represents the component that manages {@link DirectVmEndpoint}. It holds the
031 * list of named direct-vm endpoints.
032 */
033public class DirectVmComponent extends UriEndpointComponent {
034
035    private static final AtomicInteger START_COUNTER = new AtomicInteger();
036
037    // must keep a map of consumers on the component to ensure endpoints can lookup old consumers
038    // later in case the DirectVmEndpoint was re-created due the old was evicted from the endpoints LRUCache
039    // on DefaultCamelContext
040    private static final ConcurrentMap<String, DirectVmConsumer> CONSUMERS = new ConcurrentHashMap<String, DirectVmConsumer>();
041    private boolean block;
042    private long timeout = 30000L;
043
044    public DirectVmComponent() {
045        super(DirectVmEndpoint.class);
046    }
047
048    /**
049     * Gets all the consumer endpoints.
050     *
051     * @return consumer endpoints
052     */
053    public static Collection<Endpoint> getConsumerEndpoints() {
054        Collection<Endpoint> endpoints = new ArrayList<Endpoint>(CONSUMERS.size());
055        for (DirectVmConsumer consumer : CONSUMERS.values()) {
056            endpoints.add(consumer.getEndpoint());
057        }
058        return endpoints;
059    }
060
061    @Override
062    protected Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) throws Exception {
063        DirectVmEndpoint answer = new DirectVmEndpoint(uri, this);
064        answer.setBlock(block);
065        answer.setTimeout(timeout);
066        answer.configureProperties(parameters);
067        return answer;
068    }
069
070    public DirectVmConsumer getConsumer(DirectVmEndpoint endpoint) {
071        String key = getConsumerKey(endpoint.getEndpointUri());
072        return CONSUMERS.get(key);
073    }
074
075    public void addConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) {
076        String key = getConsumerKey(endpoint.getEndpointUri());
077        DirectVmConsumer existing = CONSUMERS.putIfAbsent(key, consumer);
078        if (existing != null) {
079            String contextId = existing.getEndpoint().getCamelContext().getName();
080            throw new IllegalStateException("A consumer " + existing + " already exists from CamelContext: " + contextId + ". Multiple consumers not supported");
081        }
082    }
083
084    public void removeConsumer(DirectVmEndpoint endpoint, DirectVmConsumer consumer) {
085        String key = getConsumerKey(endpoint.getEndpointUri());
086        CONSUMERS.remove(key);
087    }
088
089    private static String getConsumerKey(String uri) {
090        if (uri.contains("?")) {
091            // strip parameters
092            uri = uri.substring(0, uri.indexOf('?'));
093        }
094        return uri;
095    }
096
097    @Override
098    protected void doStart() throws Exception {
099        super.doStart();
100        START_COUNTER.incrementAndGet();
101    }
102
103    @Override
104    protected void doStop() throws Exception {
105        if (START_COUNTER.decrementAndGet() <= 0) {
106            // clear queues when no more direct-vm components in use
107            CONSUMERS.clear();
108        }
109        super.doStop();
110    }
111
112    public boolean isBlock() {
113        return block;
114    }
115
116    public void setBlock(boolean block) {
117        this.block = block;
118    }
119
120    public long getTimeout() {
121        return timeout;
122    }
123
124    public void setTimeout(long timeout) {
125        this.timeout = timeout;
126    }
127}