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* Copyright 2012 Google Inc.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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// Author: jmarantz@google.com (Joshua Marantz)
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// morlovich@google.com (Maksim Orlovich)
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#ifndef PAGESPEED_KERNEL_CACHE_DELEGATING_CACHE_CALLBACK_H_
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#define PAGESPEED_KERNEL_CACHE_DELEGATING_CACHE_CALLBACK_H_
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#include "pagespeed/kernel/base/basictypes.h"
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#include "pagespeed/kernel/base/string.h"
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#include "pagespeed/kernel/cache/cache_interface.h"
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namespace net_instaweb {
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// Helper class for implementing Caches that wrap other caches, adding
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// functionality in callbacks.
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class DelegatingCacheCallback : public CacheInterface::Callback {
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explicit DelegatingCacheCallback(CacheInterface::Callback* callback);
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virtual ~DelegatingCacheCallback();
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// Note that we have to forward validity faithfully here, as if we're
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// wrapping a 2-level cache it will need to know accurately if the value
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virtual bool ValidateCandidate(const GoogleString& key,
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CacheInterface::KeyState state);
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virtual void Done(CacheInterface::KeyState state);
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CacheInterface::Callback* callback_;
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bool validate_candidate_called_;
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DISALLOW_COPY_AND_ASSIGN(DelegatingCacheCallback);
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} // namespace net_instaweb
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#endif // PAGESPEED_KERNEL_CACHE_DELEGATING_CACHE_CALLBACK_H_