1 /* |
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2 * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 |
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26 /** |
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27 * This package contains internal common code for implementing tracing |
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28 * frameworks, and defined a number of existing frameworks. |
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29 * <p> |
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30 * There are four tracing frameworks currently defined. The "Null" and |
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31 * "Multiplex" frameworks are used internally as part of the implementation. |
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32 * The "DTrace" framework is the prime consumer framework at the moment, |
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33 * while the "PrintStream" framework is a functional, but hidden, framework |
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34 * which can be used to track probe firings. All but the "DTrace" framework |
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35 * are defined in this package. The "DTrace" framework is implemented in the |
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36 * {@code sun.tracing.dtrace} package. |
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37 * <p> |
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38 * This package also contains the {@code ProviderSkeleton} class, which |
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39 * holds most of the common code needed for implementing frameworks. |
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40 * <p> |
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41 * The "Null" framework is used when there are no other active frameworks. |
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42 * It accomplishes absolutely nothing and is merely a placeholder so that |
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43 * the application can call the tracing routines without error. |
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44 * <p> |
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45 * The "Multiplex" framework is used when there are multiple active frameworks. |
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46 * It is initialized with the framework factories and create providers and |
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47 * probes that dispatch to each active framework in turn. |
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48 * <p> |
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49 * The "PrintStream" framework is currently a debugging framework which |
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50 * dispatches trace calls to a user-defined PrintStream class, defined by |
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51 * a property. It may some day be opened up to general use. |
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52 * <p> |
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53 * See the {@code sun.tracing.dtrace} and {@code com.sun.tracing.dtrace} |
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54 * packages for information on the "DTrace" framework. |
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55 */ |
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56 |
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57 package sun.tracing; |
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