    001// Copyright 2007, 2008, 2010, 2012 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.services;
    016
    017import java.util.Map;
    018
    019import org.apache.tapestry5.ValueEncoder;
    020import org.apache.tapestry5.ioc.annotations.PostInjection;
    021import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
    022import org.apache.tapestry5.ioc.util.StrategyRegistry;
    023import org.apache.tapestry5.services.*;
    024
    025@SuppressWarnings("all")
    026public class ValueEncoderSourceImpl implements ValueEncoderSource, Runnable
    027{
    028    private final StrategyRegistry<ValueEncoderFactory> registry;
    029
    030    private final Map<Class, ValueEncoder> cache = CollectionFactory.newConcurrentMap();
    031
    032    public ValueEncoderSourceImpl(Map<Class, ValueEncoderFactory> configuration)
    033    {
    034        registry = StrategyRegistry.newInstance(ValueEncoderFactory.class, configuration);
    035    }
    036
    037    @PostInjection
    038    public void setupInvalidation(@ComponentClasses InvalidationEventHub hub) {
    039        hub.addInvalidationCallback(this);
    040    }
    041
    042    @SuppressWarnings({"unchecked"})
    043    public <T> ValueEncoder<T> getValueEncoder(Class<T> type)
    044    {
    045        assert type != null;
    046        ValueEncoder<T> result = cache.get(type);
    047
    048        if (result == null)
    049        {
    050            ValueEncoderFactory<T> factory = registry.get(type);
    051
    052            result = factory.create(type);
    053
    054            cache.put(type, result);
    055        }
    056
    057        return result;
    058    }
    059
    060    public void run()
    061    {
    062        registry.clearCache();
    063        cache.clear();
    064    }
    065}