isolate_name_server.h

// Copyright 2018 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef FLUTTER_LIB_UI_ISOLATE_NAME_SERVER_H_
#define FLUTTER_LIB_UI_ISOLATE_NAME_SERVER_H_

#include <map>
#include <mutex>
#include <string>

#include "flutter/fml/macros.h"
#include "flutter/fml/synchronization/thread_annotations.h"
#include "third_party/dart/runtime/include/dart_api.h"

#define LOCK_UNLOCK(m) FML_ACQUIRE(m) FML_RELEASE(m)

namespace blink {

class IsolateNameServer {
 public:
  IsolateNameServer() {}

  // Looks up the Dart_Port associated with a given name. Returns ILLEGAL_PORT
  // if the name does not exist.
  Dart_Port LookupIsolatePortByName(const std::string& name)
      LOCK_UNLOCK(mutex_);

  // Registers a Dart_Port with a given name. Returns true if registration is
  // successful, false if the name entry already exists.
  bool RegisterIsolatePortWithName(Dart_Port port, const std::string& name)
      LOCK_UNLOCK(mutex_);

  // Removes a name to Dart_Port mapping given a name. Returns true if the
  // mapping was successfully removed, false if the mapping does not exist.
  bool RemoveIsolateNameMapping(const std::string& name) LOCK_UNLOCK(mutex_);

 private:
  Dart_Port LookupIsolatePortByNameUnprotected(const std::string& name)
      FML_EXCLUSIVE_LOCKS_REQUIRED(mutex_);

  mutable std::mutex mutex_;
  std::map<std::string, Dart_Port> port_mapping_ FML_GUARDED_BY(mutex_);

  FML_DISALLOW_COPY_AND_ASSIGN(IsolateNameServer);
};

}  // namespace blink

#endif  // FLUTTER_LIB_UI_ISOLATE_NAME_SERVER_H_