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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.Channels;
import org.xnio.channels.StreamSourceChannel;

/**
 * A stream sink conduit which discards all data written to it.
 *
 * @author David M. Lloyd
 */
public final class NullStreamSinkConduit implements StreamSinkConduit {
    private final XnioWorker worker;
    private final XnioIoThread writeThread;
    private WriteReadyHandler writeReadyHandler;
    private boolean shutdown;
    private boolean resumed;

    /**
     * Construct a new instance.
     *
     * @param writeThread the write thread for this conduit
     */
    public NullStreamSinkConduit(final XnioIoThread writeThread) {
        this.worker = writeThread.getWorker();
        this.writeThread = writeThread;
    }

    public long transferFrom(final FileChannel src, final long position, final long count) throws IOException {
        return Channels.drain(src, position, count);
    }

    public long transferFrom(final StreamSourceChannel source, final long count, final ByteBuffer throughBuffer) throws IOException {
        throughBuffer.limit(0);
        return Channels.drain(source, count);
    }

    public int write(final ByteBuffer src) throws IOException {
        try {
            return src.remaining();
        } finally {
            src.position(src.limit());
        }
    }

    public long write(final ByteBuffer[] srcs, final int offs, final int len) throws IOException {
        long t = 0L;
        for (int i = 0; i < len; i++) {
            t += write(srcs[i + offs]);
        }
        return t;
    }

    @Override
    public int writeFinal(ByteBuffer src) throws IOException {
        return Conduits.writeFinalBasic(this, src);
    }

    @Override
    public long writeFinal(ByteBuffer[] srcs, int offset, int length) throws IOException {
        return Conduits.writeFinalBasic(this, srcs, offset, length);
    }

    public boolean flush() throws IOException {
        return true;
    }

    public boolean isWriteShutdown() {
        return shutdown;
    }

    public void suspendWrites() {
        resumed = false;
    }

    public void resumeWrites() {
        resumed = true;
        final WriteReadyHandler handler = writeReadyHandler;
        writeThread.execute(new WriteReadyHandler.ReadyTask(handler));
    }

    public void wakeupWrites() {
        resumeWrites();
    }

    public boolean isWriteResumed() {
        return resumed;
    }

    public void awaitWritable() throws IOException {
    }

    public void awaitWritable(final long time, final TimeUnit timeUnit) throws IOException {
    }

    public XnioIoThread getWriteThread() {
        return writeThread;
    }

    public void setWriteReadyHandler(final WriteReadyHandler handler) {
        writeReadyHandler = handler;
    }

    public void truncateWrites() throws IOException {
        terminateWrites();
    }

    public void terminateWrites() throws IOException {
        if (! shutdown) {
            shutdown = true;
            writeReadyHandler.terminated();
        }
    }

    public XnioWorker getWorker() {
        return worker;
    }
}