/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.wso2.carbon.rule.engine.drools;
import org.drools.command.Command;
import org.drools.command.CommandFactory;
import org.drools.runtime.ExecutionResults;
import org.drools.runtime.StatelessKnowledgeSession;
import org.wso2.carbon.rule.core.Session;
import org.wso2.carbon.rulecep.commons.NameValuePair;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* implementation for Drools API
*/
public class DroolsStatelessSession implements Session {
private StatelessKnowledgeSession statelessKnowledgeSession;
public DroolsStatelessSession(StatelessKnowledgeSession statelessKnowledgeSession) {
this.statelessKnowledgeSession = statelessKnowledgeSession;
}
/**
* Executes the drools stateless session with the given facts and returns the results of execution
*
* @param facts facts as a list of objects
* @return A list of objects representing results of rule execution
*/
public List execute(List<Object> facts) {
final List<Command> cmds = new ArrayList<Command>();
for (Object fact : facts) {
if (fact instanceof NameValuePair) {
NameValuePair pair = (NameValuePair) fact;
Object value = pair.getValue();
String name = pair.getName();
if (value != null) {
cmds.add(CommandFactory.newInsert(value, name));
}
} else {
cmds.add(CommandFactory.newInsert(fact));
}
}
final ExecutionResults executionResults = statelessKnowledgeSession.execute(
CommandFactory.newBatchExecution(cmds));
final Collection<String> results = executionResults.getIdentifiers();
final List tobeReturn = new ArrayList();
for (String name : results) {
if (name != null) {
tobeReturn.add(executionResults.getValue(name));
}
}
return tobeReturn;
}
public void release() {
}
public boolean isExpired() {
return true;
}
}