org.jboss.ejb.client.SessionID 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.ejb.client;

import java.io.Serializable;
import java.util.Arrays;

/**
 * A session ID for a stateful EJB.  Session IDs can be stored in multiple formats with different
 * characteristics.
 *
 * @author David M. Lloyd
 */
public abstract class SessionID implements Serializable {

    private static final long serialVersionUID = 3872192729805797520L;

    // The transient flags aren't really respected since we use object replacement.

    private final byte[] encodedForm;
    private final transient int hashCode;

    /**
     * Construct a new instance.  The given array is used as-is, so if it comes from an untrusted source,
     * it should first be cloned.
     *
     * @param encodedForm the encoded form of this session ID
     */
    SessionID(final byte[] encodedForm) {
        this.encodedForm = encodedForm;
        hashCode = Arrays.hashCode(encodedForm);
    }

    /**
     * Get a copy of the encoded form of this session ID.
     *
     * @return the copy of the encoded form
     */
    public byte[] getEncodedForm() {
        return encodedForm.clone();
    }

    /**
     * Get the encoded form of this session ID.  Note that callers must take care to avoid
     * modifying the encoded form.
     *
     * @return the encoded form
     */
    protected byte[] getEncodedFormRaw() {
        return encodedForm;
    }

    /**
     * Determine whether this object is equal to another.  Session IDs are equal if their encoded form is
     * equal and the class is equal.
     *
     * @param other the other object
     * @return {@code true} if they are equal, {@code false} otherwise
     */
    public final boolean equals(Object other) {
        return this == other || other != null && other.getClass() == getClass() && equals((SessionID) other);
    }

    private boolean equals(SessionID other) {
        return Arrays.equals(encodedForm, other.encodedForm);
    }

    public final int hashCode() {
        return hashCode;
    }

    /**
     * Create a session ID object for the given encoded representation.
     *
     * @param encoded the encoded representation
     * @return the session ID object
     */
    public static SessionID createSessionID(byte[] encoded) {
        final int length = encoded.length;
        if (length >= 19 && encoded[0] == 0x07) {
            return new BasicSessionID(encoded.clone());
        }
        return new UnknownSessionID(encoded.clone());
    }

    /**
     * Substitute this session ID with a serialized representation.
     *
     * @return the serialized representation
     */
    protected final Object writeReplace() {
        return new Serialized(encodedForm);
    }

    /**
     * Serialized representation of a session ID..
     */
    public static final class Serialized implements Serializable {

        private static final long serialVersionUID = -6014782612354158572L;

        /**
         * The bytes of the session ID.
         *
         * @serial
         */
        private final byte[] id;

        Serialized(final byte[] id) {
            this.id = id;
        }

        /**
         * Reconstitute the session ID from this serialized representation.
         *
         * @return the session ID object
         */
        protected Object readResolve() {
            return createSessionID(id);
        }
    }

    @Override
    public String toString() {
        return String.format("%s [%s]", getClass().getSimpleName(), ArrayUtil.bytesToString(encodedForm, 0, encodedForm.length));
    }
}