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/*
* ====================================================================
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
*/
package ch.boye.httpclientandroidlib.impl.client.cache;
import java.io.IOException;
import ch.boye.httpclientandroidlib.annotation.ThreadSafe;
import ch.boye.httpclientandroidlib.client.cache.HttpCacheEntry;
import ch.boye.httpclientandroidlib.client.cache.HttpCacheStorage;
import ch.boye.httpclientandroidlib.client.cache.HttpCacheUpdateCallback;
/**
* Basic {@link HttpCacheStorage} implementation backed by an instance of
* {@link java.util.LinkedHashMap}. In other words, cache entries and
* the cached response bodies are held in-memory. This cache does NOT
* deallocate resources associated with the cache entries; it is intended
* for use with {@link HeapResource} and similar. This is the default cache
* storage backend used by {@link CachingHttpClients}.
*
* @since 4.1
*/
@ThreadSafe
public class BasicHttpCacheStorage implements HttpCacheStorage {
private final CacheMap entries;
public BasicHttpCacheStorage(final CacheConfig config) {
super();
this.entries = new CacheMap(config.getMaxCacheEntries());
}
/**
* Places a HttpCacheEntry in the cache
*
* @param url
* Url to use as the cache key
* @param entry
* HttpCacheEntry to place in the cache
*/
public synchronized void putEntry(final String url, final HttpCacheEntry entry) throws IOException {
entries.put(url, entry);
}
/**
* Gets an entry from the cache, if it exists
*
* @param url
* Url that is the cache key
* @return HttpCacheEntry if one exists, or null for cache miss
*/
public synchronized HttpCacheEntry getEntry(final String url) throws IOException {
return entries.get(url);
}
/**
* Removes a HttpCacheEntry from the cache
*
* @param url
* Url that is the cache key
*/
public synchronized void removeEntry(final String url) throws IOException {
entries.remove(url);
}
public synchronized void updateEntry(
final String url,
final HttpCacheUpdateCallback callback) throws IOException {
final HttpCacheEntry existingEntry = entries.get(url);
entries.put(url, callback.update(existingEntry));
}
}
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