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  * Copyright 2010 JBoss Inc
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
package org.drools.runtime.conf;

An enum to configure the session query listener configuration. Query results are collected by a listener class. The "STANDARD" query listener class copies and disconnects fact handles and objects for query results, making them somewhat resilient to some working memory actions. But this copying is costly. For the cases where no concurrency exists between query execution and other working memory actions, a lightweight listener implementation can be used, preventing the copy and improving query performance significantly.

The property name for the clock type configuration
    public static final String PROPERTY_NAME = "drools.queryListener";
    private String             option;
    QueryListenerOption(String option) {
        this. = option;

    public String getPropertyName() {
        return ;
    public String getAsString() {
        return ;
    public String toString() {
        return "QueryListenerClassOption( " +  + " )";
        if ( .getAsString().equalsIgnoreCaseoption ) ) {
            return ;
        } else if ( .getAsString().equalsIgnoreCaseoption ) ) {
            return ;
        throw new IllegalArgumentException"Illegal enum value '" + option + "' for QueryListenerOption" );
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