Glassfish example source code file (AMXDebugHelper.java)

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Java - Glassfish tags/keywords

amxdebughelper, amxdebughelper, dump, dump, exception, follows, object, object, output, stack, string, string

The Glassfish AMXDebugHelper.java source code

/*
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 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * GPL Classpath Exception:
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 */

package org.glassfish.admin.amx.util;

import org.glassfish.admin.amx.util.Output;
import org.glassfish.admin.amx.util.StringUtil;

/**
Convenient wrapper around {@link AMXDebug}.
Can be made non-final if necessary; declared as 'final' until needed.
Note that the "-DAMX-DEBUG=true" must be set in order to see any output.
 */
public final class AMXDebugHelper
{
    private final Output mOutput;

    private final String mName;

    volatile boolean mEchoToStdOut;

    public AMXDebugHelper(final String name)
    {
        mOutput = AMXDebug.getInstance().getOutput(name);
        mName = name;

        mEchoToStdOut = false;
    }

    public AMXDebugHelper()
    {
        this("debug");
    }

    public boolean getEchoToStdOut(final boolean echo)
    {
        return mEchoToStdOut;
    }

    public void setEchoToStdOut(final boolean echo)
    {
        mEchoToStdOut = echo;
    }

    public boolean getDebug()
    {
        return AMXDebug.getInstance().getDebug(mName);
    }

    public void setDebug(final boolean debug)
    {
        AMXDebug.getInstance().setDebug(mName, debug);
    }

    private void printlnWithTime(final String s)
    {
        final long now = System.currentTimeMillis();
        final String msg = now + ": " + s;

        mOutput.println(msg);
        if (mEchoToStdOut)
        {
            System.out.println(msg);
        }
    }

    public void println(final Object o)
    {
        if (getDebug())
        {
            printlnWithTime("" + StringUtil.toString(o));
        }
    }

    public void println()
    {
        println("");
    }

    /**
    This form is preferred for multiple arguments so that String concatenation
    can be avoided when no message will actually be output. For example, use:
    <pre>println( a, b, c)

instead of: <pre>println( a + b + c ) */ public void println(final Object... items) { if (getDebug() && items != null) { String msg = null; if (items.length == 1) { msg = StringUtil.toString(items[0]); } else { msg = StringUtil.toString("", items); } printlnWithTime(msg); } } public void dumpStack(final String msg) { if (getDebug()) { println(); println("STACK DUMP FOLLOWS: " + msg); println(StringUtil.toString(new Exception("not a real exception"))); println(); } } }