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| 1 | /* | ||
| 2 | * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.tracing; | ||
| 27 | |||
| 28 | import java.lang.reflect.Method; | ||
| 29 | |||
| 30 | import com.sun.tracing.ProviderFactory; | ||
| 31 | import com.sun.tracing.Provider; | ||
| 32 | |||
| 33 | /** | ||
| 34 | * Factory class to create tracing Providers. | ||
| 35 | * | ||
| 36 | * This factory will create tracing instances that do nothing. | ||
| 37 | * It is used when no tracing is desired, but Provider instances still | ||
| 38 | * must be generated so that tracing calls in the application continue to | ||
| 39 | * run. | ||
| 40 | * | ||
| 41 | * @since 1.7 | ||
| 42 | */ | ||
| 43 | public class NullProviderFactory extends ProviderFactory { | ||
| 44 | |||
| 45 | /** | ||
| 46 | * Creates and returns a Null provider. | ||
| 47 | * | ||
| 48 | * See comments at {@code ProviderSkeleton.createProvider()} for more | ||
| 49 | * details. | ||
| 50 | * | ||
| 51 | * @return a provider whose probe trigger are no-ops. | ||
| 52 | */ | ||
| 53 | public <T extends Provider> T createProvider(Class<T> cls) { | ||
| 54 | NullProvider provider = new NullProvider(cls); | ||
| 55 | provider.init(); | ||
| 56 | return provider.newProxyInstance(); | ||
| 57 | } | ||
| 58 | } | ||
| 59 | |||
| 60 | class NullProvider extends ProviderSkeleton { | ||
| 61 | |||
| 62 | NullProvider(Class<? extends Provider> type) { | ||
| 63 | super(type); | ||
| 64 | } | ||
| 65 | |||
| 66 | protected ProbeSkeleton createProbe(Method m) { | ||
| 67 | return new NullProbe(m.getParameterTypes()); | ||
| 68 | } | ||
| 69 | } | ||
| 70 | |||
| 71 | class NullProbe extends ProbeSkeleton { | ||
| 72 | |||
| 73 | public NullProbe(Class<?>[] parameters) { | ||
| 74 | super(parameters); | ||
| 75 | } | ||
| 76 | |||
| 77 | public boolean isEnabled() { | ||
| 78 | return false; | ||
| 79 | } | ||
| 80 | |||
| 81 | public void uncheckedTrigger(Object[] args) { | ||
| 82 | } | ||
| 83 | } | ||
| 84 | |||