001// Copyright 2013 Apache Software Foundation
002//
003// Licensed under the Apache License, Version 2.0 (the "License");
004// you may not use this file except in compliance with the License.
005// You may obtain a copy of the License at
006//
007//     http://www.apache.org/licenses/LICENSE-2.0
008//
009// Unless required by applicable law or agreed to in writing, software
010// distributed under the License is distributed on an "AS IS" BASIS,
011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012// See the License for the specific language governing permissions and
013// limitations under the License.
014
015package org.apache.tapestry5.internal.services;
016
017import org.apache.tapestry5.beanmodel.services.*;
018import org.apache.tapestry5.http.services.Request;
019import org.apache.tapestry5.internal.util.Holder;
020import org.apache.tapestry5.ioc.IOOperation;
021import org.apache.tapestry5.ioc.OperationTracker;
022import org.apache.tapestry5.services.ComponentEventRequestParameters;
023import org.apache.tapestry5.services.ComponentRequestFilter;
024import org.apache.tapestry5.services.ComponentRequestHandler;
025import org.apache.tapestry5.services.PageRenderRequestParameters;
026
027import java.io.IOException;
028
029/**
030 * Uses {@link OperationTracker} to add an operation generally describing each request.
031 *
032 * @since 5.4
033 */
034public class RequestOperationTracker implements ComponentRequestFilter
035{
036    private final OperationTracker tracker;
037
038    private final Request request;
039
040    public RequestOperationTracker(OperationTracker tracker, Request request)
041    {
042        this.tracker = tracker;
043        this.request = request;
044    }
045
046    public void handleComponentEvent(final ComponentEventRequestParameters parameters, final ComponentRequestHandler handler) throws IOException
047    {
048        String componentId = parameters.getNestedComponentId().equals("")
049                ? parameters.getContainingPageName()
050                : parameters.getContainingPageName() + ":" + parameters.getNestedComponentId();
051
052        tracker.perform(String.format("Handling %s '%s' component event request for %s.",
053                request.isXHR() ? "Ajax" : "traditional",
054                parameters.getEventType(),
055                componentId),
056                new IOOperation<Void>()
057                {
058                    public Void perform() throws IOException
059                    {
060                        handler.handleComponentEvent(parameters);
061
062                        return null;
063                    }
064                });
065    }
066
067    public void handlePageRender(final PageRenderRequestParameters parameters, final ComponentRequestHandler handler) throws IOException
068    {
069        final Holder<IOException> holder = Holder.create();
070
071        tracker.run("Handling page render request for page " + parameters.getLogicalPageName(),
072                new Runnable()
073                {
074                    public void run()
075                    {
076                        try
077                        {
078                            handler.handlePageRender(parameters);
079                        } catch (IOException e)
080                        {
081                            holder.put(e);
082                        }
083                    }
084                }
085        );
086
087        if (holder.hasValue())
088        {
089            throw holder.get();
090        }
091    }
092}