| // 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. |
| package com.cloud.consoleproxy.vnc.network; |
| |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| |
| import java.io.IOException; |
| import java.net.InetSocketAddress; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.SelectionKey; |
| import java.nio.channels.Selector; |
| import java.nio.channels.SocketChannel; |
| import java.util.Set; |
| |
| public class NioSocket { |
| |
| private SocketChannel socketChannel; |
| private Selector writeSelector; |
| private Selector readSelector; |
| |
| private static final int CONNECTION_TIMEOUT_MILLIS = 3000; |
| protected Logger logger = LogManager.getLogger(getClass()); |
| |
| private void initializeSocket() { |
| try { |
| socketChannel = SocketChannel.open(); |
| socketChannel.configureBlocking(false); |
| socketChannel.socket().setSoTimeout(5000); |
| writeSelector = Selector.open(); |
| readSelector = Selector.open(); |
| socketChannel.register(writeSelector, SelectionKey.OP_WRITE); |
| socketChannel.register(readSelector, SelectionKey.OP_READ); |
| } catch (IOException e) { |
| logger.error("Could not initialize NioSocket: " + e.getMessage(), e); |
| } |
| } |
| |
| private void waitForSocketSelectorConnected(Selector selector) { |
| try { |
| while (selector.select(CONNECTION_TIMEOUT_MILLIS) <= 0) { |
| logger.debug("Waiting for ready operations to connect to the socket"); |
| } |
| Set<SelectionKey> keys = selector.selectedKeys(); |
| for (SelectionKey selectionKey: keys) { |
| if (selectionKey.isConnectable()) { |
| if (socketChannel.isConnectionPending()) { |
| socketChannel.finishConnect(); |
| } |
| logger.debug("Connected to the socket"); |
| break; |
| } |
| } |
| } catch (IOException e) { |
| logger.error(String.format("Error waiting for socket selector ready: %s", e.getMessage()), e); |
| } |
| } |
| |
| private void connectSocket(String host, int port) { |
| try { |
| socketChannel.connect(new InetSocketAddress(host, port)); |
| Selector selector = Selector.open(); |
| socketChannel.register(selector, SelectionKey.OP_CONNECT); |
| |
| waitForSocketSelectorConnected(selector); |
| socketChannel.socket().setTcpNoDelay(false); |
| } catch (IOException e) { |
| logger.error(String.format("Error creating NioSocket to %s:%s: %s", host, port, e.getMessage()), e); |
| } |
| } |
| |
| public NioSocket(String host, int port) { |
| initializeSocket(); |
| connectSocket(host, port); |
| } |
| |
| protected int select(boolean read, Integer timeout) { |
| try { |
| Selector selector = read ? readSelector : writeSelector; |
| selector.selectedKeys().clear(); |
| return timeout == null ? selector.select() : selector.selectNow(); |
| } catch (IOException e) { |
| logger.error(String.format("Error obtaining %s select: %s", read ? "read" : "write", e.getMessage()), e); |
| return -1; |
| } |
| } |
| |
| protected int readFromSocketChannel(ByteBuffer readBuffer, int len) { |
| try { |
| int readBytes = socketChannel.read(readBuffer.slice().limit(len)); |
| int position = readBuffer.position(); |
| readBuffer.position(position + readBytes); |
| return Math.max(readBytes, 0); |
| } catch (Exception e) { |
| logger.error("Error reading from socket channel: " + e.getMessage(), e); |
| return 0; |
| } |
| } |
| |
| protected int writeToSocketChannel(ByteBuffer buf, int len) { |
| try { |
| int writtenBytes = socketChannel.write(buf.slice().limit(len)); |
| buf.position(buf.position() + writtenBytes); |
| return writtenBytes; |
| } catch (java.io.IOException e) { |
| logger.error("Error writing bytes to socket channel: " + e.getMessage(), e); |
| return 0; |
| } |
| } |
| } |