Page Speed Optimization Libraries
1.4.26.1
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00001 /* 00002 * Copyright 2011 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 #ifndef NET_INSTAWEB_UTIL_PUBLIC_SHARED_CIRCULAR_BUFFER_H_ 00020 #define NET_INSTAWEB_UTIL_PUBLIC_SHARED_CIRCULAR_BUFFER_H_ 00021 00022 #include "net/instaweb/util/public/basictypes.h" 00023 #include "net/instaweb/util/public/scoped_ptr.h" 00024 #include "net/instaweb/util/public/string.h" 00025 #include "net/instaweb/util/public/string_util.h" 00026 00027 namespace net_instaweb { 00028 00029 class AbstractSharedMem; 00030 class AbstractSharedMemSegment; 00031 class AbstractMutex; 00032 class CircularBuffer; 00033 class MessageHandler; 00034 class Writer; 00035 00042 00043 class SharedCircularBuffer { 00044 public: 00048 SharedCircularBuffer(AbstractSharedMem* shm_runtime, 00049 const int buffer_capacity, 00050 const GoogleString& filename_prefix, 00051 const GoogleString& filename_suffix); 00052 virtual ~SharedCircularBuffer(); 00057 bool InitSegment(bool parent, MessageHandler* handler); 00059 void Clear(); 00061 bool Write(const StringPiece& message); 00063 bool Dump(Writer* writer, MessageHandler* handler); 00065 GoogleString ToString(MessageHandler* handler); 00068 void GlobalCleanup(MessageHandler* handler); 00069 00070 private: 00071 bool InitMutex(MessageHandler* handler); 00072 GoogleString SegmentName() const; 00073 00076 AbstractSharedMem* shm_runtime_; 00078 const int buffer_capacity_; 00080 CircularBuffer* buffer_; 00081 const GoogleString filename_prefix_; 00083 const GoogleString filename_suffix_; 00085 scoped_ptr<AbstractMutex> mutex_; 00087 scoped_ptr<AbstractSharedMemSegment> segment_; 00088 00089 DISALLOW_COPY_AND_ASSIGN(SharedCircularBuffer); 00090 }; 00091 00092 } 00093 00094 #endif ///< NET_INSTAWEB_UTIL_PUBLIC_SHARED_CIRCULAR_BUFFER_H_