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.spi;
018
019import java.io.Closeable;
020import java.util.List;
021import java.util.concurrent.CopyOnWriteArrayList;
022import java.util.function.Predicate;
023
024import org.apache.camel.CamelContext;
025import org.slf4j.Logger;
026import org.slf4j.LoggerFactory;
027
028/**
029 * A {@link CamelContext} creation tracker.
030 */
031public class CamelContextTracker implements Closeable {
032
033    private static final Logger LOG = LoggerFactory.getLogger(CamelContextTracker.class);
034
035    private static final List<CamelContextTracker> TRACKERS = new CopyOnWriteArrayList<>();
036
037    @FunctionalInterface
038    public interface Filter extends Predicate<CamelContext> {
039
040        boolean accept(CamelContext camelContext);
041
042        @Override
043        default boolean test(CamelContext camelContext) {
044            return accept(camelContext);
045        }
046    }
047
048    private final Filter filter;
049
050    public CamelContextTracker() {
051        filter = new Filter() {
052            public boolean accept(CamelContext camelContext) {
053                return !camelContext.getClass().getName().contains("Proxy");
054            }
055        };
056    }
057
058    public CamelContextTracker(Filter filter) {
059        this.filter = filter;
060    }
061
062    /**
063     * Called to determine whether this tracker should accept the given context.
064     */
065    public boolean accept(CamelContext camelContext) {
066        return filter == null || filter.accept(camelContext);
067    }
068
069    /**
070     * Called when a context is created.
071     */
072    public void contextCreated(CamelContext camelContext) {
073        // do nothing
074    }
075
076    public final void open() {
077        TRACKERS.add(this);
078    }
079
080    public final void close() {
081        TRACKERS.remove(this);
082    }
083
084    public static synchronized void notifyContextCreated(CamelContext camelContext) {
085        for (CamelContextTracker tracker : TRACKERS) {
086            try {
087                if (tracker.accept(camelContext)) {
088                    tracker.contextCreated(camelContext);
089                }
090            } catch (Exception e) {
091                LOG.warn("Error calling CamelContext tracker. This exception is ignored.", e);
092            }
093        }
094    }
095}