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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source
 *
 * Copyright 2013 Red Hat, Inc. and/or its affiliates.
 *
 * 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 org.xnio.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;

/**
 * A stream source conduit which is always empty.
 *
 * @author David M. Lloyd
 */
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;
            readReadyHandler.terminated();
        }
    }

    public XnioIoThread getReadThread() {
        return readThread;
    }

    public XnioWorker getWorker() {
        return worker;
    }
}