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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 2014, 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.remoting3.remote;

import java.nio.ByteBuffer;
import java.util.ArrayList;

import org.xnio.Pool;
import org.xnio.Pooled;

/**
 * @author David M. Lloyd
 */
final class DebuggingBufferPool implements Pool {
    private final Pool delegate;

    DebuggingBufferPool(final Pool delegate) {
        this.delegate = delegate;
    }

    public Pooled allocate() {
        final Pooled real = delegate.allocate();
        final StackTraceElement first = findElement(new Throwable().getStackTrace());
        return new Pooled() {
            private final ArrayList users = new ArrayList(0);
            private boolean freed;

            public void discard() {
                synchronized (this) {
                    users.clear();
                    freed = true;
                }
                real.discard();
            }

            public void free() {
                synchronized (this) {
                    users.clear();
                    freed = true;
                }
                real.free();
            }

            public ByteBuffer getResource() throws IllegalStateException {
                final ByteBuffer buffer = real.getResource();
                synchronized (this) {
                    users.add(findElement(new Throwable().getStackTrace()));
                    return buffer;
                }
            }

            protected void finalize() throws Throwable {
                synchronized (this) {
                    if (! freed) {
                        StringBuilder b = new StringBuilder();
                        b.append("Leaked a buffer which was allocated at: ");
                        format(b, first);
                        b.append(" and used at:");
                        for (StackTraceElement user : users) {
                            b.append('\n');
                            b.append('\t');
                            format(b, user);
                        }
                        RemoteLogger.log.info(b.toString());
                        discard();
                        super.finalize();
                    }
                }
            }
        };
    }

    static StackTraceElement findElement(StackTraceElement[] elements) {
        String className;
        for (final StackTraceElement element : elements) {
            className = element.getClassName();
            if (className == null) continue;
            if (className.startsWith(DebuggingBufferPool.class.getName())) {
                continue;
            }
            if ("allocate".equals(element.getMethodName())) {
                continue;
            }
            return element;
        }
        return new StackTraceElement("Unknown user", "", "", 0);
    }

    static void format(StringBuilder b, StackTraceElement e) {
        b.append(e.getClassName());
        b.append('#');
        b.append(e.getMethodName());
        b.append('(');
        final String fileName = e.getFileName();
        b.append(fileName == null ? "" : fileName);
        b.append(':');
        final int lineNumber = e.getLineNumber();
        if (lineNumber == -2) {
            b.append("");
        } else if (lineNumber == -1) {
            b.append("");
        } else {
            b.append(lineNumber);
        }
        b.append(')');
    }
}