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 /*
  * JBoss, Home of Professional Open Source
  * Copyright 2010, Red Hat, Inc., and individual contributors
  * by the @authors tag. See the copyright.txt in the distribution for a
  * full listing of individual contributors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jboss.weld.context.cache;
Caches beans over the life of a request, to allow for efficient bean lookups from proxies.

Author(s):
Stuart Douglas
public class RequestScopedBeanCache {
    private static final ThreadLocal<List<RequestScopedItem>> CACHE = new ThreadLocal<List<RequestScopedItem>>();
    private RequestScopedBeanCache() {
    }
    public static boolean isActive() {
        return .get() != null;
    }
    private static void checkCacheForAdding(final List<RequestScopedItemcache) {
        if (cache == null) {
            throw new IllegalStateException("Unable to add request scoped cache item when request cache is not active");
        }
    }
    public static void addItem(final RequestScopedItem item) {
        final List<RequestScopedItemcache = .get();
        checkCacheForAdding(cache);
        cache.add(item);
    }
    public static void addItem(final ThreadLocal item) {
        final List<RequestScopedItemcache = .get();
        checkCacheForAdding(cache);
        cache.add(new RequestScopedItem() {
            public void invalidate() {
                item.remove();
            }
        });
    }
    public static void beginRequest() {
        .set(new LinkedList<RequestScopedItem>());
    }

    
ends the request and clears the cache. This can be called before the request is over, in which case the cache will be unavailable for the rest of the request.
    public static void endRequest() {
        final List<RequestScopedItemresult = .get();
        .remove();
        if (result != null) {
            for (final RequestScopedItem item : result) {
                item.invalidate();
            }
        }
    }

    
Flushes the bean cache. The cache remains available for the rest of the request.
    public static void invalidate() {
        if (isActive()) {
            endRequest();
            beginRequest();
        }
    }
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