| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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. |
| |
| using System; |
| using System.IO; |
| using System.Threading; |
| using System.Threading.Tasks; |
| using Org.Apache.REEF.Utilities.Diagnostics; |
| using Org.Apache.REEF.Utilities.Logging; |
| |
| namespace Org.Apache.REEF.Wake.Remote.Impl |
| { |
| /// <summary> |
| /// Class with functions to Read from stream |
| /// </summary> |
| public sealed class StreamDataReader : IDataReader |
| { |
| private static readonly Logger Logger = Logger.GetLogger(typeof(StreamDataReader)); |
| |
| /// <summary> |
| /// Stream from which to read |
| /// </summary> |
| private readonly Stream _stream; |
| |
| /// <summary> |
| /// Constructs the StreamDataReader |
| /// </summary> |
| /// <param name="stream">Stream from which to read</param> |
| public StreamDataReader(Stream stream) |
| { |
| if (stream == null) |
| { |
| throw new ArgumentNullException("stream", "input stream cannot be null"); |
| } |
| |
| _stream = stream; |
| } |
| |
| /// <summary> |
| /// Reads double |
| /// </summary> |
| /// <returns>read double</returns> |
| public double ReadDouble() |
| { |
| byte[] doubleBytes = new byte[sizeof(double)]; |
| int readBytes = Read(ref doubleBytes, 0, sizeof(double)); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToDouble(doubleBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads float |
| /// </summary> |
| /// <returns>read float</returns> |
| public float ReadFloat() |
| { |
| byte[] floatBytes = new byte[sizeof(float)]; |
| int readBytes = Read(ref floatBytes, 0, sizeof(float)); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToSingle(floatBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads long |
| /// </summary> |
| /// <returns>read long</returns> |
| public long ReadLong() |
| { |
| byte[] longBytes = new byte[sizeof(long)]; |
| int readBytes = Read(ref longBytes, 0, sizeof(long)); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToInt64(longBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads bool |
| /// </summary> |
| /// <returns>read bool</returns> |
| public bool ReadBoolean() |
| { |
| byte[] boolBytes = new byte[sizeof(bool)]; |
| int readBytes = Read(ref boolBytes, 0, sizeof(bool)); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToBoolean(boolBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads integer |
| /// </summary> |
| /// <returns>read integer</returns> |
| public int ReadInt32() |
| { |
| byte[] intBytes = new byte[sizeof(int)]; |
| int readBytes = Read(ref intBytes, 0, sizeof(int)); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| |
| return BitConverter.ToInt32(intBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads short |
| /// </summary> |
| /// <returns>read short</returns> |
| public short ReadInt16() |
| { |
| byte[] intBytes = new byte[sizeof(short)]; |
| int readBytes = Read(ref intBytes, 0, sizeof(short)); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToInt16(intBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads string |
| /// </summary> |
| /// <returns>read string</returns> |
| public string ReadString() |
| { |
| int length = ReadInt32(); |
| |
| byte[] stringByte = new byte[length]; |
| int readBytes = Read(ref stringByte, 0, stringByte.Length); |
| |
| if (readBytes == -1) |
| { |
| return null; |
| } |
| |
| char[] stringChar = new char[stringByte.Length / sizeof(char)]; |
| Buffer.BlockCopy(stringByte, 0, stringChar, 0, stringByte.Length); |
| return new string(stringChar); |
| } |
| |
| /// <summary> |
| /// Reads data in to the buffer |
| /// </summary> |
| /// <param name="buffer">byte array to which to write</param> |
| /// <param name="index">starting index in the array</param> |
| /// <param name="bytesToRead">number of bytes to write</param> |
| /// <returns>Task handler that reads bytes and returns that number of bytes read |
| /// if success, otherwise -1</returns> |
| public int Read(ref byte[] buffer, int index, int bytesToRead) |
| { |
| if (buffer == null || buffer.Length < bytesToRead) |
| { |
| buffer = new byte[bytesToRead]; |
| } |
| |
| int totalBytesRead = 0; |
| while (totalBytesRead < bytesToRead) |
| { |
| int bytesRead = _stream.Read(buffer, index + totalBytesRead, bytesToRead - totalBytesRead); |
| if (bytesRead == 0) |
| { |
| // Read timed out or connection was closed |
| return -1; |
| } |
| |
| totalBytesRead += bytesRead; |
| } |
| |
| return totalBytesRead; |
| } |
| |
| /// <summary> |
| /// Reads double asynchronously |
| /// </summary> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads double</returns> |
| public async Task<double> ReadDoubleAsync(CancellationToken token) |
| { |
| byte[] boolBytes = new byte[sizeof(double)]; |
| int readBytes = await ReadAsync(boolBytes, 0, sizeof(double), token); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToDouble(boolBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads float asynchronously |
| /// </summary> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads float</returns> |
| public async Task<float> ReadFloatAsync(CancellationToken token) |
| { |
| byte[] boolBytes = new byte[sizeof(float)]; |
| int readBytes = await ReadAsync(boolBytes, 0, sizeof(float), token); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToSingle(boolBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads long asynchronously |
| /// </summary> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads long</returns> |
| public async Task<long> ReadLongAsync(CancellationToken token) |
| { |
| byte[] longBytes = new byte[sizeof(long)]; |
| int readBytes = await ReadAsync(longBytes, 0, sizeof(long), token); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToInt64(longBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads bool asynchronously |
| /// </summary> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads bool</returns> |
| public async Task<bool> ReadBooleanAsync(CancellationToken token) |
| { |
| byte[] boolBytes = new byte[sizeof(bool)]; |
| int readBytes = await ReadAsync(boolBytes, 0, sizeof(bool), token); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToBoolean(boolBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads integer asynchronously |
| /// </summary> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads integer</returns> |
| public async Task<int> ReadInt32Async(CancellationToken token) |
| { |
| byte[] intBytes = new byte[sizeof(int)]; |
| int readBytes = await ReadAsync(intBytes, 0, sizeof(int), token); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToInt32(intBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads short asynchronously |
| /// </summary> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads short</returns> |
| public async Task<short> ReadInt16Async(CancellationToken token) |
| { |
| byte[] intBytes = new byte[sizeof(short)]; |
| int readBytes = await ReadAsync(intBytes, 0, sizeof(short), token); |
| |
| if (readBytes == -1) |
| { |
| Exceptions.Throw(new Exception("No bytes read"), Logger); |
| } |
| return BitConverter.ToInt16(intBytes, 0); |
| } |
| |
| /// <summary> |
| /// Reads string asynchronously |
| /// </summary> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads string</returns> |
| public async Task<string> ReadStringAsync(CancellationToken token) |
| { |
| int length = ReadInt32(); |
| |
| byte[] stringByte = new byte[length]; |
| int readBytes = await ReadAsync(stringByte, 0, stringByte.Length, token); |
| |
| if (readBytes == -1) |
| { |
| return null; |
| } |
| |
| char[] stringChar = new char[stringByte.Length / sizeof(char)]; |
| Buffer.BlockCopy(stringByte, 0, stringChar, 0, stringByte.Length); |
| return new string(stringChar); |
| } |
| |
| /// <summary> |
| /// Reads data in to the buffer asynchronously |
| /// </summary> |
| /// <param name="buffer">byte array to which to write</param> |
| /// <param name="index">starting index in the array</param> |
| /// <param name="bytesToRead">number of bytes to write</param> |
| /// <param name="token">Cancellation token</param> |
| /// <returns>Task handler that reads bytes and returns that number of bytes read |
| /// if success, otherwise -1</returns> |
| public async Task<int> ReadAsync(byte[] buffer, int index, int bytesToRead, CancellationToken token) |
| { |
| int totalBytesRead = 0; |
| while (totalBytesRead < bytesToRead) |
| { |
| int bytesRead = await _stream.ReadAsync(buffer, totalBytesRead + index, bytesToRead - totalBytesRead, token); |
| if (bytesRead == 0) |
| { |
| // Read timed out or connection was closed |
| return -1; |
| } |
| |
| totalBytesRead += bytesRead; |
| } |
| |
| return bytesToRead; |
| } |
| } |
| } |