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 package sun.tracing; |
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27 |
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28 import java.lang.reflect.Method; |
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29 import java.lang.reflect.Field; |
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30 import com.sun.tracing.Probe; |
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31 |
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32 /** |
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33 * Provides common code for implementation of {@code Probe} classes. |
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34 * |
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35 * @since 1.7 |
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36 */ |
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37 public abstract class ProbeSkeleton implements Probe { |
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38 |
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39 protected Class<?>[] parameters; |
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40 |
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41 protected ProbeSkeleton(Class<?>[] parameters) { |
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42 this.parameters = parameters; |
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43 } |
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44 |
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45 public abstract boolean isEnabled(); // framework-dependent |
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46 |
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47 /** |
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48 * Triggers the probe with verified arguments. |
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49 * |
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50 * The caller of this method must have already determined that the |
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51 * arity and types of the arguments match what the probe was |
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52 * declared with. |
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53 */ |
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54 public abstract void uncheckedTrigger(Object[] args); // framework-dependent |
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55 |
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56 private static boolean isAssignable(Object o, Class<?> formal) { |
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57 if (o != null) { |
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58 if ( !formal.isInstance(o) ) { |
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59 if ( formal.isPrimitive() ) { // o might be a boxed primitive |
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60 try { |
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61 // Yuck. There must be a better way of doing this |
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62 Field f = o.getClass().getField("TYPE"); |
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63 return formal.isAssignableFrom((Class<?>)f.get(null)); |
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64 } catch (Exception e) { |
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65 /* fall-through. */ |
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66 } |
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67 } |
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68 return false; |
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69 } |
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70 } |
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71 return true; |
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72 } |
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73 |
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74 /** |
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75 * Performs a type-check of the parameters before triggering the probe. |
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76 */ |
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77 public void trigger(Object ... args) { |
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78 if (args.length != parameters.length) { |
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79 throw new IllegalArgumentException("Wrong number of arguments"); |
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80 } else { |
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81 for (int i = 0; i < parameters.length; ++i) { |
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82 if ( !isAssignable(args[i], parameters[i]) ) { |
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83 throw new IllegalArgumentException( |
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84 "Wrong type of argument at position " + i); |
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85 } |
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86 } |
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87 uncheckedTrigger(args); |
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88 } |
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89 } |
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90 } |
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