system_message_handler.h

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/*
 * Copyright 2014 Google Inc.
 *
 * Licensed 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.
 */


#ifndef PAGESPEED_SYSTEM_SYSTEM_MESSAGE_HANDLER_H_
#define PAGESPEED_SYSTEM_SYSTEM_MESSAGE_HANDLER_H_

#include <cstdarg>

#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/google_message_handler.h"
#include "pagespeed/kernel/base/message_handler.h"
#include "pagespeed/kernel/base/null_message_handler.h"
#include "pagespeed/kernel/base/scoped_ptr.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"

namespace net_instaweb {

class AbstractMutex;
class Timer;
class Writer;

class SystemMessageHandler : public GoogleMessageHandler {
 public:
  SystemMessageHandler(Timer* timer, AbstractMutex* mutex);

  virtual ~SystemMessageHandler();

  void set_buffer(Writer* buff);

  void SetPidString(const int64 pid) {
    pid_string_ = StrCat("[", Integer64ToString(pid), "]");
  }

  virtual bool Dump(Writer* writer);

 protected:
  void AddMessageToBuffer(MessageType type, StringPiece formatted_message);
  void AddMessageToBuffer(MessageType type, const char* file, int line,
                          StringPiece formatted_message);

  virtual void MessageVImpl(MessageType type, const char* msg, va_list args);
  virtual void FileMessageVImpl(MessageType type, const char* file,
                                int line, const char* msg, va_list args);

 private:
  friend class SystemMessageHandlerTest;

  Timer* timer_;
  scoped_ptr<AbstractMutex> mutex_;
  Writer* buffer_;
  GoogleMessageHandler internal_handler_;
  GoogleString pid_string_; 
  NullMessageHandler null_handler_;

  
};

}  

#endif