Examples of org.drools.StatelessSession

org.drools.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.

        assertEquals( "stilton",
                      list.get( 0 ) );
    }
    
    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() );
    }
    
    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() );        
    }    
    
    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() );        
    }     
    
    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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        conf.setSequential( true );
        RuleBase ruleBase = getRuleBase( conf );
        ruleBase.addPackage( pkg );
        ruleBase = SerializationHelper.serializeObject( ruleBase );


        StatelessSession session = ruleBase.newStatelessSession();
        List list = new ArrayList();
        session.setGlobal( "list",
                           list );
        session.execute( "not integer" );
        assertEquals( "not integer",
                      list.get( 0 ) );
    }

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        BinaryRuleBaseLoader loader = new BinaryRuleBaseLoader();
        loader.addPackage( new ByteArrayInputStream( binPackage ) );
        RuleBase rb = loader.getRuleBase();


        StatelessSession sess = rb.newStatelessSession();
        sess.setGlobal( "ls",
                        new ArrayList() );
        sess.execute( p );


        assertEquals( 42,
                      p.getAge() );


        impl.createPackageSnapshot( "testBinaryPackageCompile",

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        BinaryRuleBaseLoader loader = new BinaryRuleBaseLoader();
        loader.addPackage( new ByteArrayInputStream( binPackage ) );
        RuleBase rb = loader.getRuleBase();


        StatelessSession sess = rb.newStatelessSession();
        sess.execute( p );
        assertEquals( 42,
                      p.getAge() );


        impl.createPackageSnapshot( "testBinaryPackageCompileBRL",
                                    "SNAP1",

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    public void IGNORE_testLoadAndExecBinary() throws Exception {
        Person p = new Person( "fubar" );
        BinaryRuleBaseLoader loader = new BinaryRuleBaseLoader();
        loader.addPackage( this.getClass().getResourceAsStream( "/RepoBinPackage.pkg" ) );
        RuleBase rb = loader.getRuleBase();
        StatelessSession sess = rb.newStatelessSession();
        sess.execute( p );
        assertEquals( 42,
                      p.getAge() );
    }

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        BinaryRuleBaseLoader loader = new BinaryRuleBaseLoader();
        loader.addPackage( new ByteArrayInputStream( binPackage ) );
        RuleBase rb = loader.getRuleBase();


        StatelessSession sess = rb.newStatelessSession();
        sess.execute( p );
        assertEquals( 42,
                      p.getAge() );
        assertEquals( "cheese",
                      p.getLikes() );
    }

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