001// Copyright 2008, 2009, 2010 The 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.structure;
016
017import java.util.Map;
018
019import org.apache.tapestry5.internal.services.ComponentClassCache;
020import org.apache.tapestry5.internal.services.LinkSource;
021import org.apache.tapestry5.internal.services.RequestPageCache;
022import org.apache.tapestry5.ioc.LoggerSource;
023import org.apache.tapestry5.ioc.OperationTracker;
024import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
025import org.apache.tapestry5.ioc.services.PerthreadManager;
026import org.apache.tapestry5.ioc.services.TypeCoercer;
027import org.apache.tapestry5.services.ComponentClassResolver;
028import org.apache.tapestry5.services.ContextValueEncoder;
029import org.apache.tapestry5.services.messages.ComponentMessagesSource;
030import org.apache.tapestry5.services.pageload.ComponentResourceSelector;
031
032public class ComponentPageElementResourcesSourceImpl implements ComponentPageElementResourcesSource
033{
034    private final Map<ComponentResourceSelector, ComponentPageElementResources> cache = CollectionFactory
035            .newConcurrentMap();
036
037    private final ComponentMessagesSource componentMessagesSource;
038
039    private final TypeCoercer typeCoercer;
040
041    private final ComponentClassCache componentClassCache;
042
043    private final ContextValueEncoder contextValueEncoder;
044
045    private final LinkSource linkSource;
046
047    private final RequestPageCache requestPageCache;
048
049    private final ComponentClassResolver componentClassResolver;
050
051    private final LoggerSource loggerSource;
052
053    private final OperationTracker tracker;
054
055    private final PerthreadManager perThreadManager;
056
057    public ComponentPageElementResourcesSourceImpl(ComponentMessagesSource componentMessagesSource,
058            TypeCoercer typeCoercer, ComponentClassCache componentClassCache, ContextValueEncoder contextValueEncoder,
059            LinkSource linkSource, RequestPageCache requestPageCache, ComponentClassResolver componentClassResolver,
060            LoggerSource loggerSource, OperationTracker tracker, PerthreadManager perThreadManager)
061    {
062        this.componentMessagesSource = componentMessagesSource;
063        this.typeCoercer = typeCoercer;
064        this.componentClassCache = componentClassCache;
065        this.contextValueEncoder = contextValueEncoder;
066        this.linkSource = linkSource;
067        this.requestPageCache = requestPageCache;
068        this.componentClassResolver = componentClassResolver;
069        this.loggerSource = loggerSource;
070        this.tracker = tracker;
071        this.perThreadManager = perThreadManager;
072    }
073
074    public ComponentPageElementResources get(ComponentResourceSelector selector)
075    {
076        assert selector != null;
077
078        ComponentPageElementResources result = cache.get(selector);
079
080        if (result == null)
081        {
082            result = new ComponentPageElementResourcesImpl(selector, componentMessagesSource, typeCoercer,
083                    componentClassCache, contextValueEncoder, linkSource, requestPageCache, componentClassResolver,
084                    loggerSource, tracker, perThreadManager);
085
086            // Small race condition here, where we may create two instances of the CPER for the same locale,
087            // but that's not worth worrying about.
088
089            cache.put(selector, result);
090        }
091
092        return result;
093    }
094}