1 /* 2 * Copyright (c) 2014, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package execution; 25 26 import hierarchies.TypeHierarchy; 27 import scenarios.Scenario; 28 29 import java.lang.invoke.MethodHandle; 30 import java.lang.invoke.MethodHandles; 31 import java.lang.invoke.MethodType; 32 33 /** 34 * Executes test scenario using {@link MethodHandle#invoke(Object...)}. 35 * Delegates execution to the given {@link Execution} by creating 36 * new test scenario, see {@link Scenario} 37 */ 38 public class MethodHandleDelegate<T extends TypeHierarchy.I, R> implements Execution<T, R> { 39 private final Execution<T, R> delegate; 40 41 public MethodHandleDelegate(Execution<T, R> delegate) { 42 this.delegate = delegate; 43 } 44 45 @Override 46 public void execute(Scenario<T, R> scenario) { 47 delegate.execute(new MHScenario<T, R>(scenario)); 48 } 49 50 @Override 51 public String getName() { 52 return "MethodHandleDelegate # " + delegate.getName(); 53 } 54 55 private static class MHScenario<T extends TypeHierarchy.I, R> extends Scenario<T, R> { 56 private final Scenario<T, R> scenario; 57 private static final MethodHandle METHOD_HANDLE_RUN; 58 59 static { 60 MethodHandles.Lookup lookup = MethodHandles.lookup(); 61 MethodType methodType = MethodType.methodType(Object.class, TypeHierarchy.I.class); 62 63 try { 64 METHOD_HANDLE_RUN = lookup.findVirtual(Scenario.class, "run", methodType); 65 } catch (NoSuchMethodException | IllegalAccessException e) { 66 System.err.println("Failed to get target method run() with " + e); 67 e.printStackTrace(); 68 throw new RuntimeException(e); 69 } 70 } 71 72 /** 73 * Constructor 74 * 75 * @param scenario test scenario to be executed 76 */ 77 private MHScenario(Scenario<T, R> scenario) { 78 super("MethodHandle::" + scenario.getName(), scenario.profilingType, scenario.hierarchy); 79 this.scenario = scenario; 80 } 81 82 /** 83 * Runs {@link Scenario#run(T)} with {@link MethodHandle#invoke(Object...)} 84 * 85 * @param t subject of the test 86 * @return result of the underlying {@link Scenario#run(T)} invocation 87 */ 88 @SuppressWarnings("unchecked") 89 @Override 90 public R run(T t) { 91 try { 92 return (R) METHOD_HANDLE_RUN.invoke(scenario, t); 93 } catch (Throwable thr) { 94 System.err.println(scenario.getName() 95 + " failed to invoke target method run() with " + thr); 96 throw new RuntimeException("Invocation failed", thr); 97 } 98 } 99 100 @Override 101 public void check(R r, T t) { 102 scenario.check(r, t); 103 } 104 } 105 }