Examples of com.volantis.shared.environment.EnvironmentInteractionTracker

com.volantis.shared.environment.EnvironmentInteractionTracker
Encapsulates a stack of environment interactions.
Warning: This is a facade provided for use by user code, not for implementation. User implementations of this interface are highly likely to be incompatible with future releases of the product at both binary and source levels.

An environment interaction is an abstract representation of a request (and matching response) that results in a task being performed. It is possible that the environment interaction will change while performing the task. This interface allows those changes to the environment interaction to be tracked.

The root environment interaction is the one that corresponds to the underlying request that was the original trigger for the task to be performed.

J2EE environment

The following uses the J2EE environment as an illustration of how the environment interaction may change.

In the J2EE environment an environment interaction is needed for each servlet request (including JSPs). While processing a request a servlet can make use of (include) other servlets, those included servlets may be given a servlet request and response that is related to the original but may contain different headers or parameters. This means that each of those servlets needs to create its own environment interaction object that wraps the request and response that it is given. e.g.
1. A request is received by the server that causes Servlet A to be invoked.
2. Servlet A creates an environment interaction E1 and pushes it onto the stack of interactions maintained by this object.
3. Servlet A does some work and then includes JSP B which creates its own environment interaction object E2 and pushes it onto the stack.
4. JSP B pops E2 off the stack once it has finished.
5. Servlet A pops E1 off the stack once it has finished.
@volantis-api-include-in PublicAPI @volantis-api-include-in ProfessionalServicesAPI @volantis-api-include-in InternalAPI


        // factor an EnvironmentInteractionTracker
        EnvironmentFactory environmentFactory =
                EnvironmentFactory.getDefaultInstance();


        EnvironmentInteractionTracker envTracker =
                environmentFactory.createInteractionTracker();


        // push the root EnvironmentInteraction onto the tracker
        if (environmentInteraction != null) {
            envTracker.pushEnvironmentInteraction(environmentInteraction);
        }


        // factor an Expression context passing in both the Environment
        // Interaction and Namespace prefix trackers
        ExpressionContext expressionContext =

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     * Helper method which creates an expression context.
     *
     * @return the expression context
     */
    private ExpressionContext createExpressionContext() {
        EnvironmentInteractionTracker eit =
                new SimpleEnvironmentInteractionTracker();
        NamespacePrefixTracker npt = new DefaultNamespacePrefixTracker();
        ExpressionContext context = ExpressionFactory.getDefaultInstance().
                createExpressionContext(eit, npt);
        return context;

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     * Helper method which creates an expression context.
     *
     * @return the expression context
     */
    private ExpressionContext createExpressionContext() {
        EnvironmentInteractionTracker eit =
                new SimpleEnvironmentInteractionTracker();
        NamespacePrefixTracker npt = new DefaultNamespacePrefixTracker();
        ExpressionContext context = ExpressionFactory.getDefaultInstance().
                createExpressionContext(eit, npt);
        return context;

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        session.setDevice(internalDevice);
        pageContext.setDevice(session.getDevice());


        // Create an expression context for the environment context.
        final ExpressionFactory factory = ExpressionFactory.getDefaultInstance();
        final EnvironmentInteractionTracker simpleTracker =
                new SimpleEnvironmentInteractionTracker();
        final ExpressionContext exprContext = factory.
                createExpressionContext(simpleTracker,
                        new DefaultNamespacePrefixTracker());

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                pipelineFactory.getNamespaceFactory().createPrefixTracker();


        // ...and an EnvironmentInteractionTracker.
        EnvironmentFactory environmentFactory =
                EnvironmentFactory.getDefaultInstance();
        EnvironmentInteractionTracker envTracker =
                environmentFactory.createInteractionTracker();


        //create a root environment interaction to encapsulate the request
        EnvironmentInteraction rootEnvironmentInteraction =
                createRootEnvironmentInteraction(
                        httpRequest, httpResponse);
        envTracker.pushEnvironmentInteraction(rootEnvironmentInteraction);


        final ExpressionContext exprContext =
                pipelineFactory.getExpressionFactory().
                createExpressionContext(envTracker, namespaceTracker);

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        // obtain the default EnvironmentFactory
        EnvironmentFactory environmentFactory =
                EnvironmentFactory.getDefaultInstance();


        // factor an EnvironmentInteractionTracker
        EnvironmentInteractionTracker envTracker =
                environmentFactory.createInteractionTracker();
        
        // obtain the rootEnvironmentInteraction and push onto the tracker
        EnvironmentInteraction envInteraction = 
            environmentContext.createRootEnvironmentInteraction();
        envTracker.pushEnvironmentInteraction(envInteraction);


        environmentContext.pushEnvironmentInteraction(envTracker);


        // See if an expression context already exists or not; an expression
        // context is shared throughout the lifetime of the request but is

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Related Classes of com.volantis.shared.environment.EnvironmentInteractionTracker

com.volantis.mcs.context.MarinerRequestContextTestAbstract

com.volantis.mcs.expression.ExpressionSupport

com.volantis.mcs.servlet.RemappingFilter

com.volantis.xml.expression.functions.IndexOfFunctionTestCase

com.volantis.xml.expression.functions.TokenizeFunctionTestCase

com.volantis.xml.pipeline.sax.impl.XMLPipelineFactoryImpl

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Examples of com.volantis.shared.environment.EnvironmentInteractionTracker

J2EE environment

Related Classes of com.volantis.shared.environment.EnvironmentInteractionTracker