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

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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 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.DataInput;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import org.jboss.marshalling.Unmarshaller;
import org.jboss.naming.remote.protocol.ProtocolCommand;
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.SUCCESS;
import static org.jboss.naming.remote.protocol.v1.ReadUtil.prepareForUnMarshalling;

/**
 * @author John Bailey
 */
abstract class BaseProtocolCommand> implements ProtocolCommand {
    public static final int DEFAULT_TIMEOUT = 10;

    private int nextCorrelationId = 1;
    private final Map requests = new HashMap();

    private final byte commandId;

    protected BaseProtocolCommand(byte commandId) {
        this.commandId = commandId;
    }

    public byte getCommandId() {
        return commandId;
    }

    protected void readResult(final int correlationId, final DataInput input, final ValueReader valueReader) throws IOException {
        final F future = getFuture(correlationId);
        try {
            byte outcome = input.readByte();
            if (outcome == SUCCESS) {
                valueReader.read(input, future);
            } else if (outcome == FAILURE) {
                byte parameterType = input.readByte();
                if (parameterType != EXCEPTION) {
                    throw new IOException("Unexpected response parameter received.");
                }
                final Unmarshaller unmarshaller = prepareForUnMarshalling(input, this.getClass().getClassLoader());
                final Exception exception = unmarshaller.readObject(Exception.class);
                future.setHeldException(exception);
            } else {
                future.setException(new IOException("Outcome not understood"));
            }
        } catch (ClassCastException e) {
            future.setException(new IOException(e));
        } catch (ClassNotFoundException e) {
            future.setException(new IOException(e));
        } catch (IOException e) {
            future.setException(e);
        }
    }

    private synchronized int getNextCorrelationId() {
        int next = nextCorrelationId++;
        // After the maximum integer start back at the beginning.
        if (next < 0) {
            nextCorrelationId = 2;
            next = 1;
        }
        return next;
    }

    protected synchronized int reserveNextCorrelationId(F future) {
        Integer next = getNextCorrelationId();
        while (requests.containsKey(next)) {
            next = getNextCorrelationId();
        }
        requests.put(next, future);

        return next;
    }

    private synchronized F getFuture(final int correlationId) {
        return requests.get(correlationId);
    }

    protected synchronized void releaseCorrelationId(int correlationId) {
        requests.remove(correlationId);
    }


    protected interface ValueReader> {
        void read(DataInput input, F future) throws IOException;
    }
}