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/* |
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* This file is part of SingleInstance. |
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* |
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* SingleInstance is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* SingleInstance is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with SingleInstance. If not, see <https://www.gnu.org/licenses/>. |
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* |
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* Copyright (c) 2020 Vincent Quatrevieux |
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*/ |
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package fr.quatrevieux.singleinstance.ipc; |
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import java.io.Closeable; |
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import java.io.IOException; |
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import java.net.InetSocketAddress; |
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import java.nio.ByteBuffer; |
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import java.nio.channels.*; |
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import java.util.Iterator; |
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import java.util.Set; |
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import java.util.function.Consumer; |
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/** |
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* IPC server for the first running instance |
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* |
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* Usage: |
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* <pre>{@code |
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* try (InstanceServer server = new InstanceServer()) { |
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* server.open(); |
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* |
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* server.consume(message -> { |
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* // process received message |
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* if (message.name().equals(xxx)) { |
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* //... |
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* } |
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* }); |
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* } |
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* }</pre> |
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*/ |
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final public class InstanceServer implements Closeable { |
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private ServerSocketChannel serverSocket; |
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private Selector selector; |
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/** |
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* Open the server on a random port number |
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* |
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* @throws IOException When cannot start the server |
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*/ |
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public void open() throws IOException { |
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open(new InetSocketAddress("localhost", 0)); |
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} |
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/** |
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* Open the server on the given address |
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* |
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* @param address The bind address |
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* |
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* @throws IOException When cannot start the server |
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*/ |
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public void open(InetSocketAddress address) throws IOException { |
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serverSocket = ServerSocketChannel.open(); |
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serverSocket.bind(address); |
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serverSocket.configureBlocking(false); |
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} |
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/** |
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* Consume incoming messages |
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* Note: This method is blocking : a thread is not created for consuming messages |
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* |
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* @param action The message consumer |
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* |
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* @throws IOException When an error occurs during reading message |
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* @throws IllegalStateException If the server is not opened |
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*/ |
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public void consume(Consumer<Message> action) throws IOException { |
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if (serverSocket == null) { |
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throw new IllegalStateException("Server must be opened"); |
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} |
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selector = Selector.open(); |
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serverSocket.register(selector, SelectionKey.OP_ACCEPT); |
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final ByteBuffer buffer = ByteBuffer.allocate(256); |
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try { |
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while (running()) { |
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selector.select(); |
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Set<SelectionKey> selectedKeys = selector.selectedKeys(); |
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Iterator<SelectionKey> iter = selectedKeys.iterator(); |
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while (iter.hasNext()) { |
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SelectionKey key = iter.next(); |
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if (key.isAcceptable()) { |
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SocketChannel client = serverSocket.accept(); |
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client.configureBlocking(false); |
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client.register(selector, SelectionKey.OP_READ); |
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} |
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if (key.isReadable()) { |
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SocketChannel client = (SocketChannel) key.channel(); |
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client.read(buffer); |
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buffer.flip(); |
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final ProtocolParser parser = ProtocolParser.forKey(key); |
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ProtocolParser.forKey(key).parse(buffer); |
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parser.packets().forEach(action); |
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parser.clear(); |
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buffer.clear(); |
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} |
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iter.remove(); |
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} |
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} |
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} catch (ClosedSelectorException|CancelledKeyException e) { |
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// Ignore |
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} |
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} |
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/** |
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* Get the bind port number |
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* |
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* @return The port number as int |
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* @throws IllegalStateException If the server is not opened |
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*/ |
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public int port() { |
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if (serverSocket == null) { |
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throw new IllegalStateException("Server must be opened"); |
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} |
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return serverSocket.socket().getLocalPort(); |
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} |
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/** |
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* Check if the server is running |
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* |
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* @return true if the server is running |
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*/ |
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public boolean running() { |
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return selector != null && selector.isOpen() && serverSocket != null && serverSocket.isOpen(); |
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} |
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@Override |
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public void close() throws IOException { |
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1 |
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if (selector != null) { |
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1 |
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selector.close(); |
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selector = null; |
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} |
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1 |
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if (serverSocket != null) { |
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serverSocket.close(); |
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serverSocket = null; |
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} |
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1 |
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} |
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} |
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vincent4vx /
SingleInstance
