Quelle Tripwire.java Sprache: JAVA

/*
* Copyright (c) 2012, 2021, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.  Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.util;

import sun.util.logging.PlatformLogger;

import java.security.AccessController;
import java.security.PrivilegedAction;

/**
* Utility class for detecting inadvertent uses of boxing in
* {@code java.util} classes.  The detection is turned on or off based on
* whether the system property {@code org.openjdk.java.util.stream.tripwire} is
* considered {@code true} according to {@link Boolean#getBoolean(String)}.
* This should normally be turned off for production use.
*
* @apiNote
* Typical usage would be for boxing code to do:
* <pre>{@code
*     if (Tripwire.ENABLED)
*         Tripwire.trip(getClass(), "{0} calling PrimitiveIterator.OfInt.nextInt()");
* }</pre>
*
* @since 1.8
*/
final class Tripwire {
    private static final String TRIPWIRE_PROPERTY = "org.openjdk.java.util.stream.tripwire";

    /** Should debugging checks be enabled? */
    @SuppressWarnings("removal")
    static final boolean ENABLED = AccessController.doPrivileged(
            (PrivilegedAction<Boolean>) () -> Boolean.getBoolean(TRIPWIRE_PROPERTY));

    private Tripwire() { }

    /**
     * Produces a log warning, using {@code PlatformLogger.getLogger(className)},
     * using the supplied message.  The class name of {@code trippingClass} will
     * be used as the first parameter to the message.
     *
     * @param trippingClass Name of the class generating the message
     * @param msg A message format string of the type expected by
     * {@link PlatformLogger}
     */
    static void trip(Class<?> trippingClass, String msg) {
        PlatformLogger.getLogger(trippingClass.getName()).warning(msg, trippingClass.getName());
    }
}

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