Page Speed Optimization Libraries
1.6.29.3
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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/named_lock_manager.h" 00027 #include "net/instaweb/util/public/string.h" 00028 #include "net/instaweb/util/public/string_util.h" 00029 #include "pagespeed/kernel/base/scoped_ptr.h" 00030 00031 namespace net_instaweb { 00032 00033 class Hasher; 00034 class MessageHandler; 00035 class UrlAsyncFetcher; 00036 00060 class AsyncFetchWithLock : public AsyncFetch { 00061 public: 00062 AsyncFetchWithLock(const Hasher* hasher, 00063 const RequestContextPtr& request_context, 00064 const GoogleString& url, 00065 NamedLockManager* lock_manager, 00066 MessageHandler* message_handler); 00067 virtual ~AsyncFetchWithLock(); 00068 00073 static bool Start( 00074 UrlAsyncFetcher* fetcher, 00075 AsyncFetchWithLock* async_fetch_with_lock, 00076 MessageHandler* handler); 00077 00079 const GoogleString& url() const { return url_; } 00080 00081 protected: 00085 virtual bool ShouldYieldToRedundantFetchInProgress() = 0; 00086 00089 virtual void Finalize(bool lock_failure, bool success); 00090 00093 virtual bool StartFetch( 00094 UrlAsyncFetcher* fetcher, MessageHandler* handler) = 0; 00095 00099 virtual void HandleDone(bool success); 00100 00104 virtual void HandleHeadersComplete(); 00105 virtual bool HandleWrite( 00106 const StringPiece& content, MessageHandler* handler); 00107 virtual bool HandleFlush(MessageHandler* handler); 00108 00109 private: 00111 NamedLock* MakeInputLock(const GoogleString& url); 00112 00114 void set_lock(NamedLock* lock) { lock_.reset(lock); } 00115 00116 NamedLockManager* lock_manager_; 00117 scoped_ptr<NamedLock> lock_; 00118 const Hasher* lock_hasher_; 00119 GoogleString url_; 00120 MessageHandler* message_handler_; 00121 00122 DISALLOW_COPY_AND_ASSIGN(AsyncFetchWithLock); 00123 }; 00124 00125 } 00126 00127 #endif ///< NET_INSTAWEB_HTTP_PUBLIC_ASYNC_FETCH_WITH_LOCK_H_