/**************************************************************************************
* Copyright (C) 2008 EsperTech, Inc. All rights reserved. *
* http://esper.codehaus.org *
* http://www.espertech.com *
* ---------------------------------------------------------------------------------- *
* The software in this package is published under the terms of the GPL license *
* a copy of which has been included with this distribution in the license.txt file. *
**************************************************************************************/
package com.espertech.esper.adapter;
import com.espertech.esper.client.EPServiceProvider;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.core.context.util.EPStatementAgentInstanceHandle;
import com.espertech.esper.core.service.*;
import com.espertech.esper.epl.metric.StatementMetricHandle;
import com.espertech.esper.filter.FilterHandleCallback;
import com.espertech.esper.filter.FilterSpecCompiled;
import com.espertech.esper.filter.FilterSpecParam;
import com.espertech.esper.filter.FilterValueSet;
import java.util.Collection;
import java.util.LinkedList;
/**
* Subscription is a concept for selecting events for processing out of all events available from an engine instance.
*/
public abstract class BaseSubscription implements Subscription, FilterHandleCallback
{
/**
* The output adapter to which the subscription applies.
*/
protected OutputAdapter adapter;
/**
* The event type of the events we are subscribing for.
*/
protected String eventTypeName;
/**
* The name of the subscription.
*/
protected String subscriptionName;
public abstract void matchFound(EventBean event, Collection<FilterHandleCallback> allStmtMatches);
/**
* Ctor, assigns default name.
*/
public BaseSubscription()
{
subscriptionName = "default";
}
public void setSubscriptionName(String subscriptionName)
{
this.subscriptionName = subscriptionName;
}
public String getSubscriptionName()
{
return subscriptionName;
}
public String getEventTypeName()
{
return eventTypeName;
}
/**
* Set the event type name we are looking for.
* @param eventTypeName is a type name
*/
public void seteventTypeName(String eventTypeName)
{
this.eventTypeName = eventTypeName;
}
public OutputAdapter getAdapter()
{
return adapter;
}
public void registerAdapter(OutputAdapter adapter)
{
this.adapter = adapter;
registerAdapter(((AdapterSPI) adapter).getEPServiceProvider());
}
/**
* Register an adapter.
* @param epService engine
*/
public void registerAdapter(EPServiceProvider epService)
{
EPServiceProviderSPI spi = (EPServiceProviderSPI) epService;
EventType eventType = spi.getEventAdapterService().getExistsTypeByName(eventTypeName);
FilterValueSet fvs = new FilterSpecCompiled(eventType, null, new LinkedList<FilterSpecParam>(), null).getValueSet(null, null, null);
String name = "subscription:" + subscriptionName;
StatementMetricHandle metricsHandle = spi.getMetricReportingService().getStatementHandle(name, name);
EPStatementHandle statementHandle = new EPStatementHandle(name, name, name, name, false, metricsHandle, 0, false);
EPStatementAgentInstanceHandle agentHandle = new EPStatementAgentInstanceHandle(statementHandle, new StatementAgentInstanceRWLockImpl(name, false), -1, new StatementAgentInstanceFilterVersion());
EPStatementHandleCallback registerHandle = new EPStatementHandleCallback(agentHandle, this);
spi.getFilterService().add(fvs, registerHandle);
}
}