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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
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.drools.conf;

/**
 * An Enum for Event Processing option.
 * 
 * drools.eventProcessingMode = <identity|equality>
 * 
 * When the rulebase is compiled in the CLOUD (default) event processing mode,
 * it behaves just like a regular rulebase.
 * 
 * When the rulebase is compiled in the STREAM event processing mode, additional
 * assumptions are made. These assumptions allow the engine to perform a few optimisations
 * like:
 * 
 * 
  • reasoning over absence of events (NOT CE), automatically adds an appropriate duration attribute * to the rule in order to avoid early rule firing.
  • *
  • memory management techniques may be employed when an event no longer can match other events * due to session clock continuous increment.
  • */ public enum EventProcessingOption implements SingleValueKnowledgeBaseOption { CLOUD("cloud"), STREAM("stream"); /** * The property name for the sequential mode option */ public static final String PROPERTY_NAME = "drools.eventProcessingMode"; private String string; EventProcessingOption(String mode) { this.string = mode; } /** * {@inheritDoc} */ public String getPropertyName() { return PROPERTY_NAME; } public String getMode() { return string; } public String toString() { return "EventProcessingOption( "+string+ " )"; } public String toExternalForm() { return this.string; } public static EventProcessingOption determineEventProcessingMode(String mode) { if ( STREAM.getMode().equalsIgnoreCase( mode ) ) { return STREAM; } else if ( CLOUD.getMode().equalsIgnoreCase( mode ) ) { return CLOUD; } throw new IllegalArgumentException( "Illegal enum value '" + mode + "' for EventProcessingMode" ); } }




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