cc/replayd/src/Connection.h

/*
 * Copyright 2014, The Android Open Source Project
 *
 * 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 ANDROID_CAZE_CONNECTION_H
#define ANDROID_CAZE_CONNECTION_H

#include <cstddef>
#include <memory>
#include <string>

namespace android {
namespace caze {

// Abstract base class for representing a connection to the server with simple helper methods for
// sending specific data types
class Connection {
public:
    virtual ~Connection() {}

    // Try to send size bytes of data from the specified buffer using the underlying connection.
    // Will block if the connection is not ready. Returns the number of bytes successfully sent
    // (possibly less then size if an error occurred).
    virtual size_t send(const void* data, size_t size) = 0;

    // Tries to read size bytes to the buffer specified by data on the underlying connection and
    // blocks until the data is available. Returns the number of bytes successfully retrieved
    // (possibly less then size if an error occurred).
    virtual size_t recv(void* data, size_t size) = 0;

    // Returns the last error message raised by the connection.
    virtual const char* error() = 0;

    // Accept an incoming connection request on the underlying connection and returns the new
    // connection corresponding to it. The returned connection is ready to use.
    virtual std::unique_ptr<Connection> accept() = 0;

    // Helper methods for sending and receiving strings
    bool sendString(const std::string& s);
    bool readString(std::string* s);
};

}  // end of namespace caze
}  // end of namespace android

#endif