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package com.sun.xml.ws.transport;

import com.sun.xml.ws.api.EndpointAddress;
import com.sun.xml.ws.api.message.Packet;
import com.sun.xml.ws.api.pipe.*;
import com.sun.xml.ws.api.pipe.helper.AbstractTubeImpl;
import com.sun.istack.NotNull;

import javax.xml.ws.BindingProvider;

/**
 * Proxy transport {@link Tube} and {@link Pipe} that lazily determines the
 * actual transport pipe by looking at {@link Packet#endpointAddress}.
 *
 * 
 * This pseudo transport is used when there's no statically known endpoint address,
 * and thus it's expected that the application will configure {@link BindingProvider}
 * at runtime before making invocation.
 *
 * 
 * Since a typical application makes multiple invocations with the same endpoint
 * address, this class implements a simple cache strategy to avoid re-creating
 * transport pipes excessively.
 *
 * @author Kohsuke Kawaguchi
 */
public final class DeferredTransportPipe extends AbstractTubeImpl {

    private Tube transport;
    private EndpointAddress address;

    // parameter to TransportPipeFactory
    private final ClassLoader classLoader;
    private final ClientTubeAssemblerContext context;

    public DeferredTransportPipe(ClassLoader classLoader, ClientPipeAssemblerContext context) {
        this(classLoader, new ClientTubeAssemblerContext(context.getAddress(), context.getWsdlModel(),
                context.getBindingProvider(), context.getBinding(), context.getContainer(), context.getCodec(), context.getSEIModel()));
    }

    public DeferredTransportPipe(ClassLoader classLoader, ClientTubeAssemblerContext context) {
        this.classLoader = classLoader;
        this.context = context;
        //See if we can create the transport pipe from the available information.
        try {
            this.transport = TransportTubeFactory.create(classLoader, context);
            this.address = context.getAddress();
        } catch(Exception e) {
            //No problem, transport will be initialized while processing the requests
        }
    }

    public DeferredTransportPipe(DeferredTransportPipe that, TubeCloner cloner) {
        super(that,cloner);
        this.classLoader = that.classLoader;
        this.context = that.context;
        if(that.transport!=null) {
            this.transport = ((PipeCloner)cloner).copy(that.transport);
            this.address = that.address;
       }
    }
    public NextAction processException(@NotNull Throwable t) {
        return transport.processException(t);
    }

    public NextAction processRequest(@NotNull Packet request) {
        if(request.endpointAddress==address)
            // cache hit
            return transport.processRequest(request);

        // cache miss

        if(transport!=null) {
            // delete the current entry
            transport.preDestroy();
            transport = null;
            address = null;
        }

        // otherwise find out what transport will process this.

        ClientTubeAssemblerContext newContext = new ClientTubeAssemblerContext(
            request.endpointAddress,
            context.getWsdlModel(),
            context.getBindingProvider(),
            context.getBinding(),
            context.getContainer(),
            context.getCodec().copy(),
            context.getSEIModel()
        );

        address = request.endpointAddress;
        transport = TransportTubeFactory.create(classLoader, newContext);
        // successful return from the above method indicates a successful pipe creation
        assert transport!=null;

        return transport.processRequest(request);
    }

    public NextAction processResponse(@NotNull Packet response) {
        return transport.processResponse(response);
    }

    public void preDestroy() {
        if(transport!=null) {
            transport.preDestroy();
            transport = null;
            address = null;
        }
    }

    public DeferredTransportPipe copy(TubeCloner cloner) {
        return new DeferredTransportPipe(this,cloner);
        /*
        DeferredTransportPipe copy = new DeferredTransportPipe(classLoader,context);
        cloner.add(this,copy);

        // TODO Is the following thread-safe ??
        // copied pipeline is still likely to work with the same endpoint address,
        // so also copy the cached transport pipe, if any
        if(transport!=null) {
            copy.transport = cloner.copy(this.transport);
            copy.address = this.address;
        }

        return copy;
        */
    }
}