JDK8/Java8源码在线阅读

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 * 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).
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/**
 * 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

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