org.jboss.naming.remote.protocol.v1.WriteUtil Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote Jakarta Enterprise Beans and Jakarta Messaging, including all dependencies. It is intended for use by those not using maven, maven users should just import the Jakarta Enterprise Beans and Jakarta Messaging 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 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.jboss.naming.remote.protocol.v1;

import java.io.DataOutput;
import java.io.IOException;
import java.io.OutputStream;
import org.jboss.marshalling.ByteOutput;
import org.jboss.marshalling.Marshaller;
import org.jboss.marshalling.MarshallerFactory;
import org.jboss.marshalling.Marshalling;
import org.jboss.marshalling.MarshallingConfiguration;
import org.jboss.naming.remote.protocol.CancellableDataOutputStream;
import static org.jboss.naming.remote.protocol.v1.Constants.EXCEPTION;
import static org.jboss.naming.remote.protocol.v1.Constants.FAILURE;
import static org.jboss.naming.remote.protocol.v1.Constants.MARSHALLING_STRATEGY;
import static org.jboss.naming.remote.protocol.v1.Constants.OBJECT;
import static org.jboss.naming.remote.protocol.v1.Constants.SUCCESS;
import org.jboss.remoting3.Channel;
import org.xnio.IoUtils;

/**
 * @author John Bailey
 */
class WriteUtil {
    static final MarshallerFactory marshallerFactory;

    static {
        marshallerFactory = Marshalling.getProvidedMarshallerFactory(MARSHALLING_STRATEGY);
        if (marshallerFactory == null) {
            throw new RuntimeException("Could not find a marshaller factory for " + MARSHALLING_STRATEGY + " marshalling strategy");
        }
    }

    static interface Writer {
        void write(DataOutput output) throws IOException;
    }

    static void write(final Channel channel, Writer writer) throws IOException {
        CancellableDataOutputStream output = new CancellableDataOutputStream(channel.writeMessage());
        try {
            writer.write(output);
        } catch (IOException e) {
            output.cancel();
            throw e;
        } finally {
            IoUtils.safeClose(output);
        }
    }

    static void writeResponse(final Channel channel, final byte command, final int correlationId) throws IOException {
        write(channel, new Writer() {
            public void write(DataOutput output) throws IOException {
                output.writeByte(command);
                output.writeInt(correlationId);
                output.writeByte(SUCCESS);
            }
        });
    }

    static void writeExceptionResponse(final Channel channel, final Exception e, final byte command, final int correlationId) throws IOException {
        write(channel, new Writer() {
            public void write(DataOutput output) throws IOException {
                output.writeByte(command);
                output.writeInt(correlationId);
                output.writeByte(FAILURE);
                output.writeByte(EXCEPTION);

                Marshaller marshaller = prepareForMarshalling(output);
                marshaller.writeObject(e);
                marshaller.finish();
            }
        });

    }

    static void writeResponse(final Channel channel, final Object response, final byte command, final int correlationId) throws IOException {
        write(channel, new Writer() {
            public void write(DataOutput output) throws IOException {
                output.writeByte(command);
                output.writeInt(correlationId);
                output.writeByte(SUCCESS);
                output.writeByte(OBJECT);

                Marshaller marshaller = prepareForMarshalling(output);
                marshaller.writeObject(response);
                marshaller.finish();
            }
        });

    }

    static Marshaller prepareForMarshalling(final DataOutput dataOutput) throws IOException {
        final Marshaller marshaller = getMarshaller(marshallerFactory);
        final OutputStream outputStream = new OutputStream() {
            @Override
            public void write(int b) throws IOException {
                final int byteToWrite = b & 0xff;
                dataOutput.write(byteToWrite);
            }

            @Override
            public void write(final byte[] b) throws IOException {
                dataOutput.write(b);
            }

            @Override
            public void write(final byte[] b, final int off, final int len) throws IOException {
                dataOutput.write(b, off, len);
            }
        };
        final ByteOutput byteOutput = Marshalling.createByteOutput(outputStream);
        // start the marshaller
        marshaller.start(byteOutput);

        return marshaller;
    }

    static Marshaller getMarshaller(final MarshallerFactory marshallerFactory) throws IOException {
        final MarshallingConfiguration marshallingConfiguration = new MarshallingConfiguration();
        marshallingConfiguration.setVersion(2);
        return marshallerFactory.createMarshaller(marshallingConfiguration);
    }
}