/*
***************************************************************************************
* Copyright (C) 2006 EsperTech, Inc. All rights reserved. *
* http://www.espertech.com/esper *
* 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.core.service;
import com.espertech.esper.client.EPOnDemandQueryResult;
import com.espertech.esper.client.EPStatementException;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.context.ContextPartitionSelector;
import com.espertech.esper.core.start.EPPreparedExecuteMethod;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Provides prepared query functionality.
*/
public class EPPreparedQueryImpl implements EPOnDemandPreparedQuerySPI {
private static final Logger log = LoggerFactory.getLogger(EPPreparedQueryImpl.class);
private final EPPreparedExecuteMethod executeMethod;
private final String epl;
/**
* Ctor.
*
* @param executeMethod used at execution time to obtain query results
* @param epl is the EPL to execute
*/
public EPPreparedQueryImpl(EPPreparedExecuteMethod executeMethod, String epl) {
this.executeMethod = executeMethod;
this.epl = epl;
}
public EPOnDemandQueryResult execute() {
return executeInternal(null);
}
public EPOnDemandQueryResult execute(ContextPartitionSelector[] contextPartitionSelectors) {
if (contextPartitionSelectors == null) {
throw new IllegalArgumentException("No context partition selectors provided");
}
return executeInternal(contextPartitionSelectors);
}
private EPOnDemandQueryResult executeInternal(ContextPartitionSelector[] contextPartitionSelectors) {
try {
EPPreparedQueryResult result = executeMethod.execute(contextPartitionSelectors);
return new EPQueryResultImpl(result);
} catch (EPStatementException ex) {
throw ex;
} catch (Throwable t) {
String message = "Error executing statement: " + t.getMessage();
log.error("Error executing on-demand statement '" + epl + "': " + t.getMessage(), t);
throw new EPStatementException(message, epl);
}
}
public EPPreparedExecuteMethod getExecuteMethod() {
return executeMethod;
}
public EventType getEventType() {
return executeMethod.getEventType();
}
}