Examples of org.drools.runtime.CommandExecutor

org.drools.runtime.CommandExecutor
rns 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.


        if ( !(cmd instanceof BatchExecutionCommandImpl) ) {
            cmd = new BatchExecutionCommandImpl( Arrays.asList( new GenericCommand< ? >[]{(GenericCommand<?>) cmd} ) );
        }


        CommandExecutor exec;
        ExecutionNodePipelineContextImpl droolsContext = exchange.getProperty( "drools-context",
                                                                                   ExecutionNodePipelineContextImpl.class );
        if ( droolsContext != null ) {
            exec = droolsContext.getCommandExecutor();
        } else {
            exec = de.getExecutor();
            if ( exec == null ) {
                String lookup = exchange.getIn().getHeader( DroolsComponent.DROOLS_LOOKUP,
                                                                String.class );
                if ( StringUtils.isEmpty( lookup ) && (cmd instanceof BatchExecutionCommandImpl) ) {
                    lookup = ((BatchExecutionCommandImpl) cmd).getLookup();
                }


                if ( de.getGridNode() != null && !StringUtils.isEmpty( lookup ) ) {
                    exec = de.getGridNode().get( lookup,
                                                     CommandExecutor.class );
                    if ( exec == null ) {
                        throw new RuntimeException( "ExecutionNode is unable to find ksession=" + lookup + " for uri" + de.getEndpointUri() );
                    }
                } else {
                    throw new RuntimeException( "No ExecutionNode, unable to find ksession=" + lookup + " for uri" + de.getEndpointUri() );
                }
            }
        }


        if ( exec == null ) {
            throw new RuntimeException( "No defined ksession for uri" + de.getEndpointUri() );
        }


        ExecutionResults results = exec.execute( (BatchExecutionCommandImpl) cmd );;
        exchange.getOut().setBody( results );
    }

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                unwrapper = ExchangeUnwrapper.INSTANCE;
                break;
        }


        // Creates the actual worker
        CommandExecutor exec = de.getExecutor();
        if ( exec instanceof StatefulKnowledgeSession ) {
            WorkingMemoryEntryPoint wmep;
            String ep = de.getEntryPoint();
            if ( ep != null ) {
                wmep = ((StatefulKnowledgeSession) exec).getWorkingMemoryEntryPoint( ep );

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            ClassLoader originalClassLoader = null;
            try {
                originalClassLoader = Thread.currentThread().getContextClassLoader();


                CommandExecutor exec = dep.executor;
                if ( exec == null ) {
                    String lookup = exchange.getIn().getHeader( DroolsComponent.DROOLS_LOOKUP,
                                                                String.class );
                    if ( StringUtils.isEmpty( lookup ) ) {
                        //Bad Hack - Need to remote it and fix it in Camel (if it's a camel problem)

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            ClassLoader originalClassLoader = null;
            try {
                originalClassLoader = Thread.currentThread().getContextClassLoader();
                
                CommandExecutor exec = dep.executor;
                if ( exec == null ) {
                    String lookup = exchange.getIn().getHeader( DroolsComponent.DROOLS_LOOKUP, String.class );
                    if ( StringUtils.isEmpty( lookup )  ) {
                        lookup = dep.getLookup( exchange.getIn().getBody( String.class ) );
                    }

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            if ( !(cmd instanceof BatchExecutionCommandImpl) ) {
                cmd = new BatchExecutionCommandImpl( Arrays.asList( new GenericCommand< ? >[]{(GenericCommand) cmd} ) );
            }


            CommandExecutor exec;
            ExecutionNodePipelineContextImpl droolsContext = exchange.getProperty( "drools-context",
                                                                                   ExecutionNodePipelineContextImpl.class );
            if ( droolsContext != null ) {
                exec = droolsContext.getCommandExecutor();
            } else {
                exec = de.getExecutor();
                if ( exec == null ) {
                    String lookup = exchange.getIn().getHeader( DroolsComponent.DROOLS_LOOKUP,
                                                                String.class );
                    if ( StringUtils.isEmpty( lookup ) && (cmd instanceof BatchExecutionCommandImpl) ) {
                        lookup = ((BatchExecutionCommandImpl) cmd).getLookup();
                    }


                    if ( de.getExecutionNode() != null && !StringUtils.isEmpty( lookup ) ) {
                        exec = de.getExecutionNode().get( DirectoryLookupFactoryService.class ).lookup( lookup );
                        if ( exec == null ) {
                            throw new RuntimeException( "ExecutionNode is unable to find ksession=" + lookup  +" for uri" + de.getEndpointUri() );
                        }
                    } else {
                        throw new RuntimeException( "No ExecutionNode, unable to find ksession=" + lookup +" for uri" + de.getEndpointUri());
                    }
                }
            }
            
            if ( exec == null ) {
                throw new RuntimeException( "No defined ksession for uri" + de.getEndpointUri() );
            }            


            ExecutionResults results = exec.execute( (BatchExecutionCommandImpl) cmd );;


//            if ( de.dataFormat != null ) {
//                ByteArrayOutputStream baos = new ByteArrayOutputStream();
//                de.dataFormat.marshal( exchange,
//                                       results,

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                throw new IllegalArgumentException("Unable to lookup XStream parser using name '" + name + "'");
            }
            ExecutionNodePipelineContextImpl executionNodeContext = (ExecutionNodePipelineContextImpl) context;
            GridNode node = executionNodeContext.getGridNode();
            
            CommandExecutor executor = node.get(name, CommandExecutor.class);
            if (executor == null) {
                throw new IllegalArgumentException("Unable to lookup CommandExecutor using name '" + name + "'");
            }
            executionNodeContext.setCommandExecutor(executor);
            ClassLoader cl = null;

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        return kbase;
    }


    public static CommandExecutor createKnowledgeSession(KnowledgeBase kbase,GridNode node,String type,String name){
        CommandExecutor ksession;


        if (type.equals("stateful"))
            ksession = kbase.newStatefulKnowledgeSession();
        else
            ksession = kbase.newStatelessKnowledgeSession();

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        return kbase;
    }


    public static CommandExecutor createKnowledgeSession(KnowledgeBase kbase,GridNode node,String type,String name){
        CommandExecutor ksession;


        if (type.equals("stateful")) {


            //Adding a configuration forces drools to use the current classloader (see issue SM-2316)
            ksession = kbase.newStatefulKnowledgeSession(new SessionConfiguration(), null);

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                    throw new RuntimeException("Response was not correctly received");
                }
                String value = (String) ((ExecutionResults) object).getValue(commandId);
                String type = String.valueOf(value.charAt(0));
                String instanceId = value.substring(2);
                CommandExecutor executor = null;
                switch (Integer.parseInt(type)) {
                    case 0:
                        {
                            executor = new StatefulKnowledgeSessionRemoteClient(instanceId, client, messageSession);
                            break;

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            if (xstream == null) {
                throw new IllegalArgumentException("Unable to lookup XStream parser using name '" + name + "'");
            }
            ExecutionNodePipelineContextImpl executionNodeContext = (ExecutionNodePipelineContextImpl) context;
            ExecutionNode node = executionNodeContext.getExecutionNode();
            CommandExecutor executor = node.get(DirectoryLookupFactoryService.class).lookup(name);
            if (executor == null) {
                throw new IllegalArgumentException("Unable to lookup CommandExecutor using name '" + name + "'");
            }
            executionNodeContext.setCommandExecutor(executor);
            ClassLoader cl = null;

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