/* * JBoss, Home of Professional Open Source. * Copyright 2014 Red Hat, Inc., and individual contributors * as indicated by the @author tags. * * 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. */ package io.undertow.conduits; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; import java.util.concurrent.TimeUnit; import org.xnio.XnioIoThread; import org.xnio.XnioWorker; import org.xnio.channels.StreamSinkChannel; import org.xnio.conduits.ReadReadyHandler; import org.xnio.conduits.StreamSourceConduit; /** * A stream source conduit which is always empty. * * Temporary copy from XNIO, see https://issues.jboss.org/browse/XNIO-199 * * @author <a href="mailto:david.lloyd@redhat.com">David M. Lloyd</a> */ public final class EmptyStreamSourceConduit implements StreamSourceConduit { private final XnioWorker worker; private final XnioIoThread readThread; private ReadReadyHandler readReadyHandler; private boolean shutdown; private boolean resumed; /** * Construct a new instance. * * @param readThread the read thread for this conduit */ public EmptyStreamSourceConduit(final XnioIoThread readThread) { this.worker = readThread.getWorker(); this.readThread = readThread; } public void setReadReadyHandler(final ReadReadyHandler handler) { readReadyHandler = handler; } public long transferTo(final long position, final long count, final FileChannel target) throws IOException { return 0; } public long transferTo(final long count, final ByteBuffer throughBuffer, final StreamSinkChannel target) throws IOException { resumed = false; return -1L; } public int read(final ByteBuffer dst) throws IOException { resumed = false; return -1; } public long read(final ByteBuffer[] dsts, final int offs, final int len) throws IOException { resumed = false; return -1L; } public boolean isReadShutdown() { return shutdown; } public void resumeReads() { resumed = true; readThread.execute(new Runnable() { public void run() { final ReadReadyHandler handler = readReadyHandler; if (handler != null) { handler.readReady(); } } }); } public void suspendReads() { resumed = false; } public void wakeupReads() { resumeReads(); } public boolean isReadResumed() { return resumed; } public void awaitReadable() throws IOException { // always ready } public void awaitReadable(final long time, final TimeUnit timeUnit) throws IOException { // always ready } public void terminateReads() throws IOException { if (! shutdown) { shutdown = true; if(readReadyHandler != null) { readReadyHandler.terminated(); } } } public XnioIoThread getReadThread() { return readThread; } public XnioWorker getWorker() { return worker; } }