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
015 package org.apache.tapestry5.internal.structure;
016
017 import java.util.Map;
018
019 import org.apache.tapestry5.internal.services.ComponentClassCache;
020 import org.apache.tapestry5.internal.services.LinkSource;
021 import org.apache.tapestry5.internal.services.RequestPageCache;
022 import org.apache.tapestry5.ioc.LoggerSource;
023 import org.apache.tapestry5.ioc.OperationTracker;
024 import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
025 import org.apache.tapestry5.ioc.services.PerthreadManager;
026 import org.apache.tapestry5.ioc.services.TypeCoercer;
027 import org.apache.tapestry5.services.ComponentClassResolver;
028 import org.apache.tapestry5.services.ContextValueEncoder;
029 import org.apache.tapestry5.services.messages.ComponentMessagesSource;
030 import org.apache.tapestry5.services.pageload.ComponentResourceSelector;
031
032 public 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 }