/* * Copyright (c) 2008, 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. */ /** * This package contains internal common code for implementing tracing * frameworks, and defined a number of existing frameworks. * <p> * There are four tracing frameworks currently defined.  The "Null" and * "Multiplex" frameworks are used internally as part of the implementation. * The "DTrace" framework is the prime consumer framework at the moment, * while the "PrintStream" framework is a functional, but hidden, framework * which can be used to track probe firings.  All but the "DTrace" framework * are defined in this package.  The "DTrace" framework is implemented in the * {@code sun.tracing.dtrace} package. * <p> * This package also contains the {@code ProviderSkeleton} class, which * holds most of the common code needed for implementing frameworks. * <p> * The "Null" framework is used when there are no other active frameworks. * It accomplishes absolutely nothing and is merely a placeholder so that * the application can call the tracing routines without error. * <p> * The "Multiplex" framework is used when there are multiple active frameworks. * It is initialized with the framework factories and create providers and * probes that dispatch to each active framework in turn. * <p> * The "PrintStream" framework is currently a debugging framework which * dispatches trace calls to a user-defined PrintStream class, defined by * a property.  It may some day be opened up to general use. * <p> * See the {@code sun.tracing.dtrace} and {@code com.sun.tracing.dtrace} * packages for information on the "DTrace" framework. */ package sun.tracing;