Page Speed Optimization Libraries
1.8.31.3
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00001 /* 00002 * Copyright 2013 Google Inc. 00003 * 00004 * Licensed under the Apache License, Version 2.0 (the "License"); 00005 * you may not use this file except in compliance with the License. 00006 * You may obtain a copy of the License at 00007 * 00008 * http:///www.apache.org/licenses/LICENSE-2.0 00009 * 00010 * Unless required by applicable law or agreed to in writing, software 00011 * distributed under the License is distributed on an "AS IS" BASIS, 00012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00013 * See the License for the specific language governing permissions and 00014 * limitations under the License. 00015 */ 00016 00018 00019 00020 #ifndef NET_INSTAWEB_HTTP_PUBLIC_ASYNC_FETCH_WITH_LOCK_H_ 00021 #define NET_INSTAWEB_HTTP_PUBLIC_ASYNC_FETCH_WITH_LOCK_H_ 00022 00023 #include "net/instaweb/http/public/async_fetch.h" 00024 #include "net/instaweb/http/public/request_context.h" 00025 #include "net/instaweb/util/public/basictypes.h" 00026 #include "net/instaweb/util/public/string.h" 00027 #include "net/instaweb/util/public/string_util.h" 00028 #include "pagespeed/kernel/base/scoped_ptr.h" 00029 00030 namespace net_instaweb { 00031 00032 class Hasher; 00033 class MessageHandler; 00034 class NamedLock; 00035 class NamedLockManager; 00036 class UrlAsyncFetcher; 00037 00061 class AsyncFetchWithLock : public AsyncFetch { 00062 public: 00063 AsyncFetchWithLock(const Hasher* hasher, 00064 const RequestContextPtr& request_context, 00065 const GoogleString& url, 00066 const GoogleString& cache_key, 00067 NamedLockManager* lock_manager, 00068 MessageHandler* message_handler); 00069 virtual ~AsyncFetchWithLock(); 00070 00074 bool Start(UrlAsyncFetcher* fetcher); 00075 00077 const GoogleString& url() const { return url_; } 00078 00080 const GoogleString& cache_key() const { return cache_key_; } 00081 00082 protected: 00086 virtual bool ShouldYieldToRedundantFetchInProgress() = 0; 00087 00090 virtual void Finalize(bool lock_failure, bool success); 00091 00094 virtual bool StartFetch( 00095 UrlAsyncFetcher* fetcher, MessageHandler* handler) = 0; 00096 00100 virtual void HandleDone(bool success); 00101 00105 virtual void HandleHeadersComplete(); 00106 virtual bool HandleWrite( 00107 const StringPiece& content, MessageHandler* handler); 00108 virtual bool HandleFlush(MessageHandler* handler); 00109 00110 private: 00112 NamedLock* MakeInputLock(const GoogleString& url); 00113 00114 NamedLockManager* lock_manager_; 00115 scoped_ptr<NamedLock> lock_; 00116 const Hasher* lock_hasher_; 00117 GoogleString url_; 00118 GoogleString cache_key_; 00119 MessageHandler* message_handler_; 00120 00121 DISALLOW_COPY_AND_ASSIGN(AsyncFetchWithLock); 00122 }; 00123 00124 } 00125 00126 #endif ///< NET_INSTAWEB_HTTP_PUBLIC_ASYNC_FETCH_WITH_LOCK_H_