EsperComponent.java

/**
 * ************************************************************************************
 * https://camel-extra.github.io
 *
 * 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.
 *
 * http://www.gnu.org/licenses/gpl-2.0-standalone.html
 * *************************************************************************************
 */
package org.apacheextras.camel.component.esper;

import java.util.Map;

import com.espertech.esper.client.Configuration;
import com.espertech.esper.client.EPRuntime;
import com.espertech.esper.client.EPServiceProvider;
import com.espertech.esper.client.EPServiceProviderManager;

import org.apache.camel.Endpoint;
import org.apache.camel.impl.DefaultComponent;

/**
 * A component for working with <a href="http//esper.codehaus.org/">Esper</a>
 *
 * @version $Revision: 1.1 $
 */
public class EsperComponent extends DefaultComponent {

    /**
     * Event processing service provider.
     */
    private EPServiceProvider esperService;

    /**
     * Esper runtime environment.
     */
    private EPRuntime esperRuntime;

    /**
     * Creates an Esper endpoint. {@inheritDoc}
     *
     * @param uri
     * @param remaining
     * @param parameters
     * @return Endpoint
     * @throws java.lang.Exception
     */
    @Override
    protected Endpoint createEndpoint(String uri, String remaining, Map parameters) throws Exception {
        return new EsperEndpoint(uri, this, remaining);
    }

    /**
     * Returns the event processing service provider. If the provider is null an
     * instance will be created via the EPServiceProviderManager.
     *
     * @return event processing service provider
     */
    public EPServiceProvider getEsperService(boolean configured) {
        if (esperService == null) {
            if (configured) {
                Configuration configuration = new Configuration();
                configuration.configure();
                esperService = EPServiceProviderManager.getProvider("DefaultConfiguredProvider", configuration);
            } else {
                esperService = EPServiceProviderManager.getDefaultProvider();
            }
        }
        return esperService;
    }

    /**
     * Sets the Esper service provider.
     *
     * @param esperService
     */
    public void setEsperService(EPServiceProvider esperService) {
        this.esperService = esperService;
    }

    /**
     * Returns the Esper runtime object.
     *
     * @return EPRuntime
     */
    public EPRuntime getEsperRuntime(boolean configured) {
        if (esperRuntime == null) {
            esperRuntime = getEsperService(configured).getEPRuntime();
        }
        return esperRuntime;
    }

    @Override
    protected void doStop() throws Exception {
    	super.doStop();
    	
    	// destroy esper instance
    	if(esperService != null && !esperService.isDestroyed()) {
    		esperService.destroy();
    	}
    }
}