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view agent/ipc/windows-named-pipes/server/src/main/java/com/redhat/thermostat/agent/ipc/winpipes/server/internal/ClientPipeInstance.java @ 2589:a6ba41a449c8
[PATCH] Windows Named Pipes - preliminary implementation
A preliminary implementation of windows named pipes.
Does not set windoes named pipes as default IPC; remains TCP
reviewed-by: aazores, ebaron
review-thread: http://icedtea.classpath.org/pipermail/thermostat/2017-February/022126.html
author | Simon Tooke <stooke@redhat.com> |
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date | Fri, 10 Feb 2017 15:52:51 -0500 |
parents | |
children | 2885a4a290d0 |
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/* * Copyright 2012-2017 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.agent.ipc.winpipes.server.internal; import com.redhat.thermostat.agent.ipc.server.ThermostatIPCCallbacks; import com.redhat.thermostat.agent.ipc.winpipes.common.internal.WinPipesNativeHelper; import com.redhat.thermostat.common.utils.LoggingUtils; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.WritableByteChannel; import java.util.ArrayList; import java.util.concurrent.ExecutorService; import java.util.logging.Logger; /** * one ClientPipeInstance per expected client * Created when pipe is created - the pipe can't handle more clients than there are ClientPipeInstances * * On a connect, will create a ClientHandler (destroyed on disconnect) * On a read or write, will delegate that to the ClientHandler, which will decide if the next action is a read or write * Disconnect destroys the active ClientHandler * * see https://msdn.microsoft.com/en-us/library/windows/desktop/aa365603%28v=vs.85%29.aspx * http://www.winsocketdotnetworkprogramming.com/winsock2programming/winsock2advancednamedpipe15.html * see http://www.winsocketdotnetworkprogramming.com/winsock2programming/winsock2advancednamedpipe15c.html */ class ClientPipeInstance implements WritableByteChannel, PipeManager { enum PipeState { UNKNOWN_STATE, CONNECTING_STATE, CONNECTED_STATE, CLOSED_STATE } private PipeState state; private static final Logger logger = LoggingUtils.getLogger(ClientPipeInstance.class); private final ClientPipeInstanceHelper clientHandlerCreator; private final ExecutorService execService; private final ThermostatIPCCallbacks ipcCallbacks; private final String pipeName; private final long pipeHandle; private ReadPipeImpl readHandler; private WritePipeImpl writeHandler; ClientPipeInstance(final String name, int instances, int bufsize, ExecutorService execService, ThermostatIPCCallbacks cb) throws IOException { this(name, instances, bufsize, execService, cb, new ClientPipeInstanceHelper()); } ClientPipeInstance(final String name, int instances, int bufsize, ExecutorService execService, ThermostatIPCCallbacks cb, ClientPipeInstanceHelper cpiHelper) throws IOException { this.state = PipeState.UNKNOWN_STATE; this.pipeName = name; this.execService = execService; this.ipcCallbacks = cb; this.clientHandlerCreator = cpiHelper; this.pipeHandle = clientHandlerCreator.createNamedPipe(name, instances, bufsize); if (this.pipeHandle == 0) { throw new IOException("can't create Windows named pipe " + name + " err=" + clientHandlerCreator.getLastError()); } this.readHandler = new ReadPipeImpl(this, name, pipeHandle, bufsize); this.writeHandler = new WritePipeImpl(this, name, pipeHandle, bufsize); } public String toString() { return "ClientPipeInstance(t=" + Thread.currentThread().getId() + "hnd=" + pipeHandle + ", read=" + readHandler + " write=" + writeHandler +")"; } public String getName() { return pipeName; } WindowsEventSelector.EventHandler getReadHandler() { return readHandler; } WindowsEventSelector.EventHandler getWriteHandler() { return writeHandler; } // for WritableByteChannel @Override public boolean isOpen() { return state == PipeState.CONNECTED_STATE || state == PipeState.CONNECTING_STATE; } @Override public void close() throws IOException { if (state != PipeState.CLOSED_STATE) { logger.finest("closing " + this); readHandler.close(); writeHandler.close(); clientHandlerCreator.closeHandle(pipeHandle); state = PipeState.CLOSED_STATE; } } @Override public int write(ByteBuffer src) throws IOException { return writeHandler.write(src); } /** * Wait for a client to connect to this pipe * Since we created the pipe in blocking mode, this call will block. */ boolean connectToNewClient() throws IOException { state = PipeState.CONNECTING_STATE; final boolean ret = readHandler.connectToNewClient(); state = readHandler.getReadState() == ReadPipeImpl.ReadPipeState.READING_STATE ? PipeState.CONNECTED_STATE : PipeState.CONNECTING_STATE; return ret; } private void disconnect() throws IOException { logger.finest("WinPipe disconnect() " + this); if (!clientHandlerCreator.disconnectNamedPipe(pipeHandle)) { throw new IOException("could not disconnect named pipe"); } } @Override public void resetPipe() throws IOException { logger.finest("WinPipe resetPipe() " + this); disconnect(); state = PipeState.UNKNOWN_STATE; connectToNewClient(); } @Override public ClientHandler handleNewClientConnection() { return this.clientHandlerCreator.createClientHandler(this, execService, ipcCallbacks); } // for testing static class ClientPipeInstanceHelper { private static WinPipesNativeHelper helper = WinPipesNativeHelper.INSTANCE; ClientHandler createClientHandler(ClientPipeInstance pi, ExecutorService execService, ThermostatIPCCallbacks callbacks) { return new ClientHandler(pi, execService, callbacks); } long createNamedPipe(final String pipeName, int instances, int buffersize) { return helper.createNamedPipe(pipeName, instances, buffersize); } boolean disconnectNamedPipe(long pipeHandle) { return helper.disconnectNamedPipe(pipeHandle); } boolean closeHandle(long handle) { return helper.closeHandle(handle); } int getLastError() { return helper.getLastError(); } } }