Start line:  
End line:  

Snippet Preview

Snippet HTML Code

Stack Overflow Questions
  * 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;

Batch Executor allows for the scripting of of a Knowledge session using Commands, both the StatelessKnowledgeSession and StatefulKnowledgeSession implement this interface.

Commands are created using the CommandFactory and executed using the "execute" method, such as the following insert Command:

 ksession.execute( CommandFactory.newInsert( person ) );

Typically though you will want to execute a batch of commands, this can be achieved via the composite Command BatchExecution. Further to this results are scoped to this execute call and return via the ExecutionResults:

 List<Command> cmds = new ArrayList<Command>();
 cmds.add( CommandFactory.newSetGlobal( "list1", new ArrayList(), true ) );
 cmds.add( CommandFactory.newInsert( new Person( "jon", 102 ), "person" ) );
 cmds.add( CommandFactory.newQuery( "Get People" "getPeople" );
 ExecutionResults results = ksession.execute( CommandFactory.newBatchExecution( cmds ) );
 results.getValue( "list1" ); // returns the ArrayList
 results.getValue( "person" ); // returns the inserted fact Person
 results.getValue( "Get People" );// returns the query as a QueryResults instance.

The CommandFactory details the supported commands, all of which can marshalled using XStream and the BatchExecutionHelper. BatchExecutionHelper provides details on the xml format as well as how to use Drools Pipeline to automate the marshalling of BatchExecution and ExecutionResults.

public interface CommandExecutor {
Execute the command and return a ExecutionResults for the results of the Command.

    public <T> T execute(Command<T> command);
New to GrepCode? Check out our FAQ X