    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.beanmodel.services.*;
    021import org.apache.tapestry5.commons.services.InvalidationEventHub;
    022import org.apache.tapestry5.commons.util.CollectionFactory;
    023import org.apache.tapestry5.commons.util.StrategyRegistry;
    024import org.apache.tapestry5.ioc.annotations.ComponentClasses;
    025import org.apache.tapestry5.ioc.annotations.PostInjection;
    026import org.apache.tapestry5.services.ValueEncoderFactory;
    027import org.apache.tapestry5.services.ValueEncoderSource;
    028
    029@SuppressWarnings("all")
    030public class ValueEncoderSourceImpl implements ValueEncoderSource, Runnable
    031{
    032    private final StrategyRegistry<ValueEncoderFactory> registry;
    033
    034    private final Map<Class, ValueEncoder> cache = CollectionFactory.newConcurrentMap();
    035
    036    public ValueEncoderSourceImpl(Map<Class, ValueEncoderFactory> configuration)
    037    {
    038        registry = StrategyRegistry.newInstance(ValueEncoderFactory.class, configuration);
    039    }
    040
    041    @PostInjection
    042    public void setupInvalidation(@ComponentClasses InvalidationEventHub hub) {
    043        hub.addInvalidationCallback(this);
    044    }
    045
    046    @SuppressWarnings({"unchecked"})
    047    public <T> ValueEncoder<T> getValueEncoder(Class<T> type)
    048    {
    049        assert type != null;
    050        ValueEncoder<T> result = cache.get(type);
    051
    052        if (result == null)
    053        {
    054            ValueEncoderFactory<T> factory = registry.get(type);
    055
    056            result = factory.create(type);
    057
    058            cache.put(type, result);
    059        }
    060
    061        return result;
    062    }
    063
    064    public void run()
    065    {
    066        registry.clearCache();
    067        cache.clear();
    068    }
    069}