org.drools.builder.KnowledgeBuilderConfiguration Maven / Gradle / Ivy
/**
* 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.builder;
import org.drools.PropertiesConfiguration;
import org.drools.builder.conf.KnowledgeBuilderOptionsConfiguration;
/**
*
* This class configures the knowledge package builder and compiler.
* Dialects and their DialectConfigurations are handled by the DialectRegistry
* Normally you will not need to look at this class, unless you want to override the defaults.
*
*
*
* This class will automatically load default values from a number of places, accumulating properties from each location.
* This list of locations, in given priority is:
* System properties, home directory, working directory, META-INF/ of optionally provided classLoader
* META-INF/ of Thread.currentThread().getContextClassLoader() and META-INF/ of ClassLoader.getSystemClassLoader()
*
*
*
* So if you want to set a default configuration value for all your new KnowledgeBuilder, you can simply set the property as
* a System property.
*
*
*
* This class is not thread safe and it also contains state. After the KnowledgeBuilder is created, it makes the configuration
* immutable and there is no way to make it mutable again. This is to avoid inconsistent behaviour inside KnowledgeBuilder.
*
*
*
*
* - drools.dialect.default = <String>
* - drools.accumulate.function.<function name> = <qualified class>
* - drools.evaluator.
= <qualified class>
* - drools.dump.dir = <String>
* - drools.parser.processStringEscapes = <true|false>
*
*
*
*
* Two dialects are supported, Java and MVEL. Java is the default dialect.
* The Java dialect supports the following configurations:
*
* - drools.dialect.java.compiler = <ECLIPSE|JANINO>
* - drools.dialect.java.lngLevel = <1.5|1.6>
*
*
* And MVEL supports the following configurations:
*
* - drools.dialect.mvel.strict = <true|false>
*
*
*
*
* So for example if we wanted to create a new KnowledgeBuilder that used Janino as the default compiler we would do the following:
*
* KnowledgeBuilderConfiguration config = KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration();
* config.setProperty("drools.dialect.java.compiler", "JANINO");
* KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder( config );
*
*
*
*
* Remember the KnowledgeBuilderConfiguration could have taken a Properties instance with that setting in it at constructor time,
* or it could also discover from a disk based properties file too.
*
*
*
* Available pre-configured Accumulate functions are:
*
* - drools.accumulate.function.average = org.drools.base.accumulators.AverageAccumulateFunction
* - drools.accumulate.function.max = org.drools.base.accumulators.MaxAccumulateFunction
* - drools.accumulate.function.min = org.drools.base.accumulators.MinAccumulateFunction
* - drools.accumulate.function.count = org.drools.base.accumulators.CountAccumulateFunction
* - drools.accumulate.function.sum = org.drools.base.accumulators.SumAccumulateFunction
* - drools.accumulate.function.collectSet = org.drools.base.accumulators.CollectSetAccumulateFunction
* - drools.accumulate.function.collectList = org.drools.base.accumulators.CollectListAccumulateFunction
*
*
*/
public interface KnowledgeBuilderConfiguration
extends
PropertiesConfiguration,
KnowledgeBuilderOptionsConfiguration {
}