EsperEngine.java

/*
 * gw2live - GuildWars 2 Dynamic Map
 * 
 * Website: http://gw2map.com
 *
 * Copyright 2013   zyclonite    networx
 *                  http://zyclonite.net
 * Developer: Lukas Prettenthaler
 */
package net.zyclonite.gw2live.service;

import com.espertech.esper.client.Configuration;
import com.espertech.esper.client.EPServiceProvider;
import com.espertech.esper.client.EPServiceProviderManager;
import com.espertech.esper.client.EPStatement;
import net.zyclonite.gw2live.util.AppConfig;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 *
 * @author zyclonite
 */
public class EsperEngine {

    private static final Log LOG = LogFactory.getLog(EsperEngine.class);
    private static final EsperEngine instance;
    private static AppConfig config;
    private final EPServiceProvider epService;

    static {
        instance = new EsperEngine();
    }

    private EsperEngine() {
        config = AppConfig.getInstance();
        final int inbound = config.getInt("statistics.threadpools.inbound", 0);
        final int outbound = config.getInt("statistics.threadpools.outbound", 0);
        final int route = config.getInt("statistics.threadpools.route", 0);
        final int timer = config.getInt("statistics.threadpools.timer", 0);
        final Configuration espconfig = new Configuration();
        espconfig.getEngineDefaults().getThreading().setListenerDispatchPreserveOrder(false);
        if (inbound > 0) {
            espconfig.getEngineDefaults().getThreading().setThreadPoolInbound(true);
            espconfig.getEngineDefaults().getThreading().setThreadPoolInboundNumThreads(inbound);
        }
        if (outbound > 0) {
            espconfig.getEngineDefaults().getThreading().setThreadPoolOutbound(true);
            espconfig.getEngineDefaults().getThreading().setThreadPoolOutboundNumThreads(outbound);
        }
        if (route > 0) {
            espconfig.getEngineDefaults().getThreading().setThreadPoolRouteExec(true);
            espconfig.getEngineDefaults().getThreading().setThreadPoolRouteExecNumThreads(route);
        }
        if (timer > 0) {
            espconfig.getEngineDefaults().getThreading().setThreadPoolTimerExec(true);
            espconfig.getEngineDefaults().getThreading().setThreadPoolTimerExecNumThreads(timer);
        }
        //change preserve order for insert into statement (could end up in 100ms latch delay if true)
        espconfig.getEngineDefaults().getThreading().setInsertIntoDispatchPreserveOrder(false);
        espconfig.setPatternMaxSubexpressions(10000L);//security feature - prevent memory leak
        espconfig.addEventTypeAutoName("net.zyclonite.gw2live.model");

        epService = EPServiceProviderManager.getProvider("stats", espconfig);
        LOG.debug("EsperEngine initialized");
    }

    public void killCache() {
        epService.destroy();
    }

    public void sendEvent(final Object event) {
        epService.getEPRuntime().sendEvent(event);
    }

    public EPStatement createEPL(final String stmt) {
        return epService.getEPAdministrator().createEPL(stmt);
    }

    public static EsperEngine getInstance() {
        return instance;
    }
}