simple_buffered_apache_fetch.h

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// Copyright 2015 Google Inc.

#ifndef PAGESPEED_SIMPLE_BUFFERED_APACHE_FETCH_H_
#define PAGESPEED_SIMPLE_BUFFERED_APACHE_FETCH_H_

#include <memory>
#include <queue>
#include <utility>

#include "net/instaweb/http/public/async_fetch.h"
#include "net/instaweb/http/public/request_context.h"
#include "pagespeed/apache/apache_writer.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/condvar.h"
#include "pagespeed/kernel/base/message_handler.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/base/thread_annotations.h"
#include "pagespeed/kernel/base/thread_system.h"
#include "pagespeed/kernel/http/request_headers.h"
#include "pagespeed/kernel/http/response_headers.h"

struct request_rec;

namespace net_instaweb {

class SimpleBufferedApacheFetch : public AsyncFetch {
 public:
  SimpleBufferedApacheFetch(
      const RequestContextPtr& request_context,
      RequestHeaders* request_headers,
      ThreadSystem* thread_system,
      request_rec* req,
      MessageHandler* handler);
  ~SimpleBufferedApacheFetch() override;

  void Wait() LOCKS_EXCLUDED(mutex_);

  bool IsCachedResultValid(const ResponseHeaders& headers) override
      LOCKS_EXCLUDED(mutex_);

 protected:
  void HandleHeadersComplete() override LOCKS_EXCLUDED(mutex_);
  void HandleDone(bool success) override LOCKS_EXCLUDED(mutex_);
  bool HandleFlush(MessageHandler* handler) override LOCKS_EXCLUDED(mutex_);
  bool HandleWrite(const StringPiece& sp, MessageHandler* handler) override
      LOCKS_EXCLUDED(mutex_);

 private:
  enum Op {
    kOpHeadersComplete,
    kOpWrite,
    kOpFlush,
    kOpDone
  };

  typedef std::pair<Op, GoogleString> OpInfo;

  void WaitForOp(OpInfo* out) LOCKS_EXCLUDED(mutex_);

  void SendOutHeaders();

  std::unique_ptr<ApacheWriter> apache_writer_;
  MessageHandler* message_handler_;

  std::unique_ptr<ThreadSystem::CondvarCapableMutex> mutex_;
  std::unique_ptr<ThreadSystem::Condvar> notify_;
  std::queue<OpInfo> queue_;

  bool wait_called_ GUARDED_BY(mutex_);

  
};

}  

#endif