dependency_tracker.h

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/*
 * Copyright 2016 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 NET_INSTAWEB_REWRITER_PUBLIC_DEPENDENCY_TRACKER_H_
#define NET_INSTAWEB_REWRITER_PUBLIC_DEPENDENCY_TRACKER_H_

#include <memory>

#include "net/instaweb/rewriter/dependencies.pb.h"
#include "pagespeed/kernel/base/basictypes.h"
#include "pagespeed/kernel/base/string.h"
#include "pagespeed/kernel/base/string_util.h"
#include "pagespeed/kernel/base/thread_annotations.h"

namespace net_instaweb {

class AbstractMutex;
class RewriteDriver;
class ServerContext;

class DependencyTracker {
 public:
  explicit DependencyTracker(RewriteDriver* driver);
  ~DependencyTracker();

  void SetServerContext(ServerContext* server_context);

  void Start();

  void FinishedParsing();

  int RegisterDependencyCandidate();

  void ReportDependencyCandidate(int id, const Dependency* dep);

  const Dependencies* read_in_info() const { return read_in_info_.get(); }

 private:
  void Clear() LOCKS_EXCLUDED(mutex_);
  void ClearLockHeld() EXCLUSIVE_LOCKS_REQUIRED(mutex_);
  void WriteToPropertyCacheIfDone() EXCLUSIVE_LOCKS_REQUIRED(mutex_);

  RewriteDriver* driver_;

  std::unique_ptr<AbstractMutex> mutex_;

  std::unique_ptr<Dependencies> read_in_info_;

  std::map<int, Dependency> computed_info_ GUARDED_BY(mutex_);

  int next_id_ GUARDED_BY(mutex_);
  int outstanding_candidates_ GUARDED_BY(mutex_);

  bool saw_end_ GUARDED_BY(mutex_);

  
};


class DependencyOrderCompator {
 public:
  bool operator()(const Dependency& a, const Dependency& b);
};

}  

#endif