Examples of org.drools.core.StatelessSession

org.drools.core.StatelessSession
This represents a working memory session where state is not kept between invocations. This is typically used for "decision services" where the rules are provided all the data in one hit, and a conclusion reached by the engine. (there is no accumulation of facts/knowledge - each invocation is on a fresh session). Each created StatelessSession can be call execute() any number of times, in a stateless manner however the GlobalResolver, unless set each time, is shared between each execute() method call. Care should be used when using the async versions of the methods, consult the javadoc for the specific information.

//        
//    }
    
    @Test
    public void testAsynCollectionOjbectcAssert() throws Exception {
        StatelessSession session = getSession();


        final Cheese stilton = new Cheese( "stilton",
                                           5 );


        List collection = new ArrayList();
        collection.add( stilton );
        session.execute( collection );


        Thread.sleep( 100 );


        assertEquals( "stilton",
                      list.get( 0 ) );

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                      list.get( 0 ) );
    }
    
    @Test
    public void testCopyIdentifierGlobalExporterOneValue() throws Exception {
        StatelessSession session = getSession();


        // notice I don't export Cheessery
        session.setGlobalExporter( new CopyIdentifiersGlobalExporter( new String[]{"list"} ) );


        StatelessSessionResult result = session.executeWithResults( (Object) null );


        assertSame( this.list,
                    result.getGlobal( "list" ) );


        // cheesery should be null

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        assertNotSame( this.globalResolver, result.getGlobalResolver() );
    }
    
    @Test
    public void testCopyIdentifierGlobalExporterTwoValues() throws Exception {
        StatelessSession session = getSession();


        session.setGlobalExporter( new CopyIdentifiersGlobalExporter( new String[]{"list", "cheesery"} ) );


        StatelessSessionResult result = session.executeWithResults( (Object) null );


        assertSame( this.list,
                    result.getGlobal( "list" ) );


        // cheesery should be null

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        assertNotSame( this.globalResolver, result.getGlobalResolver() );
    }
    
    @Test
    public void testCopyIdentifierGlobalExporterAllValues() throws Exception {
        StatelessSession session = getSession();


        // I've not specified any identifiers, so it should do them alll
        session.setGlobalExporter( new CopyIdentifiersGlobalExporter() );


        StatelessSessionResult result = session.executeWithResults( (Object) null );


        assertSame( this.list,
                    result.getGlobal( "list" ) );


        // cheesery should be null

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        assertNotSame( this.globalResolver, result.getGlobalResolver() );
    }
    
    @Test
    public void testReferenceOriginalGlobalExporter() throws Exception {
        StatelessSession session = getSession();


        // I've not specified any identifiers, so it should do them alll
        session.setGlobalExporter( new ReferenceOriginalGlobalExporter() );


        StatelessSessionResult result = session.executeWithResults( (Object) null );


        assertSame( this.list,
                    result.getGlobal( "list" ) );


        // cheesery should be null

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        final Package pkg = builder.getPackage();


        RuleBase ruleBase = getRuleBase();
        ruleBase.addPackage( pkg );
        ruleBase    = SerializationHelper.serializeObject(ruleBase);
        StatelessSession session = ruleBase.newStatelessSession();
        
        session    = SerializationHelper.serializeObject(session);
        session.setGlobalResolver( this.globalResolver );


        session.setGlobal( "list",
                           this.list );
        session.setGlobal( "cheesery",
                           this.cheesery );
        return session;
    }

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                        long start = 0;
                        long previous = 0;
                        
                        while (true) {
                            start = System.currentTimeMillis();
                            StatelessSession sess = rb.newStatelessSession();
                            try {
                                sess    = SerializationHelper.serializeObject(sess);
                            } catch (Exception ex) {
                                throw new RuntimeException(ex);
                            }
                            Person p = new Person();
                            p.setName( "Michael" );
                            Address add1 = new Address();
                            add1.setStreet( "High" );
                            Address add2 = new Address();
                            add2.setStreet( "Low" );
                            List l = new ArrayList();
                            l.add( add1 ); l.add( add2 );
                            p.setAddresses( l );
                            sess.execute( p );
                            
                            long current = System.currentTimeMillis() - start;
                            if (previous != 0) {
                                float f = current/previous;
                                if (f > 1) {

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        PackageBuilder builder = new PackageBuilder();
        builder.addPackageFromDrl(ResourceFactory.newByteArrayResource(str.getBytes()));
        RuleBase rb = RuleBaseFactory.newRuleBase();
        rb.addPackages(builder.getPackages());
        StatelessSession ss = rb.newStatelessSession();
        ss.execute(new Object[]{
                new MyPerson("John", 20, Arrays.asList(
                        new MyPerson("John Jr 1st", 10, Arrays.asList(new MyPerson("John Jr Jr", 4, Collections.<MyPerson>emptyList()))),
                        new MyPerson("John Jr 2nd", 8, Collections.<MyPerson>emptyList())))
                , new MyPerson("Jeff", 30, Arrays.asList(
                new MyPerson("Jeff Jr 1st", 10, Collections.<MyPerson>emptyList()),

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    /**
     * Initialize this <code>RuleSession</code>
     * with a new <code>WorkingMemory</code>.
     */
    protected StatelessSession newStatelessSession() {
        final StatelessSession session = this.getRuleExecutionSet().newStatelessSession();


        final Map props = this.getProperties();
        if ( props != null ) {
            for ( final Iterator iterator = props.entrySet().iterator(); iterator.hasNext(); ) {
                final Map.Entry entry = (Map.Entry) iterator.next();
                session.setGlobal( (String) entry.getKey(),
                                            entry.getValue() );
            }
        }
        return session;
    }

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     * @throws InvalidRuleSessionException
     *             on illegal rule session state.
     */
    public List executeRules(final List objects,
                             final ObjectFilter filter) throws InvalidRuleSessionException {
        StatelessSession session = newStatelessSession();
        StatelessSessionResult results = session.executeWithResults( objects );
        
        return IteratorToList.convert( results.iterateObjects( new ObjectFilterAdapter( filter ) ) );
    }

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Related Classes of org.drools.core.StatelessSession

org.drools.compiler.integrationtests.AccumulateTest

org.drools.compiler.integrationtests.sequential.SequentialTest

org.drools.compiler.integrationtests.StatelessSessionTest

org.drools.compiler.integrationtests.StatelessStressTest

org.drools.jsr94.rules.StatelessRuleSessionImpl

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