EsperWireTapChannelsBeanPostProcessor.java

/*
 * OpenCredo-Esper - simplifies adopting Esper in Java applications. 
 * Copyright (C) 2010  OpenCredo Ltd.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package org.opencredo.esper.integration.config.xml;

import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.regex.Pattern;

import org.opencredo.esper.integration.interceptor.EsperWireTap;
import org.springframework.beans.BeansException;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.integration.channel.AbstractMessageChannel;
import org.springframework.util.Assert;

public class EsperWireTapChannelsBeanPostProcessor implements BeanPostProcessor {

    @SuppressWarnings("rawtypes")
    private final Map channelPatternMappings;

    public EsperWireTapChannelsBeanPostProcessor(@SuppressWarnings("rawtypes") Map channelPatternMappings) {
        Assert.notNull(channelPatternMappings, "channelPatternMappings must not be null");
        this.channelPatternMappings = channelPatternMappings;
    }

    public Object postProcessBeforeInitialization(Object bean, String beanName) throws BeansException {
        return bean;
    }

    public Object postProcessAfterInitialization(Object bean, String beanName) throws BeansException {
        if (bean instanceof AbstractMessageChannel) {
            this.addMatchingWireTaps((AbstractMessageChannel) bean);
        }

        return bean;
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    private void addMatchingWireTaps(AbstractMessageChannel channel) {

        Assert.notNull(channel.getComponentName(), "channel name must not be null");

        Set<Entry> patternWireTapEntries = this.channelPatternMappings.entrySet();

        for (Entry patternWireTapEntry : patternWireTapEntries) {
            if (((Pattern) patternWireTapEntry.getKey()).matcher(channel.getComponentName()).matches()) {
                channel.addInterceptor((EsperWireTap) patternWireTapEntry.getValue());
            }
        }
    }
}