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| 1 | +/* |
| 2 | + * Licensed to the Apache Software Foundation (ASF) under one or more |
| 3 | + * contributor license agreements. See the NOTICE file distributed with |
| 4 | + * this work for additional information regarding copyright ownership. |
| 5 | + * The ASF licenses this file to You under the Apache License, Version 2.0 |
| 6 | + * (the "License"); you may not use this file except in compliance with |
| 7 | + * the License. You may obtain a copy of the License at |
| 8 | + * |
| 9 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | + * |
| 11 | + * Unless required by applicable law or agreed to in writing, software |
| 12 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | + * See the License for the specific language governing permissions and |
| 15 | + * limitations under the License. |
| 16 | + * |
| 17 | + */ |
| 18 | + |
| 19 | +package org.apache.skywalking.apm.agent.core.boot; |
| 20 | + |
| 21 | +import java.lang.reflect.Field; |
| 22 | +import java.lang.reflect.Method; |
| 23 | +import java.util.ArrayList; |
| 24 | +import java.util.Arrays; |
| 25 | +import java.util.LinkedHashMap; |
| 26 | +import java.util.List; |
| 27 | +import java.util.Map; |
| 28 | +import org.junit.After; |
| 29 | +import org.junit.Test; |
| 30 | + |
| 31 | +import static org.hamcrest.CoreMatchers.is; |
| 32 | +import static org.hamcrest.MatcherAssert.assertThat; |
| 33 | + |
| 34 | +public class ServiceManagerOrderingTest { |
| 35 | + |
| 36 | + private final List<String> prepareOrder = new ArrayList<>(); |
| 37 | + private final List<String> bootOrder = new ArrayList<>(); |
| 38 | + private final List<String> shutdownOrder = new ArrayList<>(); |
| 39 | + |
| 40 | + private class RecordingService implements BootService { |
| 41 | + private final String name; |
| 42 | + private final int priority; |
| 43 | + |
| 44 | + private RecordingService(String name, int priority) { |
| 45 | + this.name = name; |
| 46 | + this.priority = priority; |
| 47 | + } |
| 48 | + |
| 49 | + @Override |
| 50 | + public void prepare() { |
| 51 | + prepareOrder.add(name); |
| 52 | + } |
| 53 | + |
| 54 | + @Override |
| 55 | + public void boot() { |
| 56 | + bootOrder.add(name); |
| 57 | + } |
| 58 | + |
| 59 | + @Override |
| 60 | + public void onComplete() { |
| 61 | + } |
| 62 | + |
| 63 | + @Override |
| 64 | + public void shutdown() { |
| 65 | + shutdownOrder.add(name); |
| 66 | + } |
| 67 | + |
| 68 | + @Override |
| 69 | + public int priority() { |
| 70 | + return priority; |
| 71 | + } |
| 72 | + } |
| 73 | + |
| 74 | + @After |
| 75 | + public void tearDown() throws Exception { |
| 76 | + setBootedServices(new LinkedHashMap<>()); |
| 77 | + } |
| 78 | + |
| 79 | + @Test |
| 80 | + public void higherPriorityBootsFirstAndShutsDownLast() throws Exception { |
| 81 | + Map<Class, BootService> services = new LinkedHashMap<>(); |
| 82 | + services.put(Integer.class, new RecordingService("low", 0)); |
| 83 | + services.put(Long.class, new RecordingService("high", Integer.MAX_VALUE)); |
| 84 | + services.put(Short.class, new RecordingService("mid", 100)); |
| 85 | + setBootedServices(services); |
| 86 | + |
| 87 | + invoke("prepare"); |
| 88 | + invoke("startup"); |
| 89 | + ServiceManager.INSTANCE.shutdown(); |
| 90 | + |
| 91 | + assertThat(prepareOrder, is(Arrays.asList("high", "mid", "low"))); |
| 92 | + assertThat(bootOrder, is(Arrays.asList("high", "mid", "low"))); |
| 93 | + assertThat(shutdownOrder, is(Arrays.asList("low", "mid", "high"))); |
| 94 | + } |
| 95 | + |
| 96 | + private void setBootedServices(Map<Class, BootService> services) throws Exception { |
| 97 | + Field field = ServiceManager.class.getDeclaredField("bootedServices"); |
| 98 | + field.setAccessible(true); |
| 99 | + field.set(ServiceManager.INSTANCE, services); |
| 100 | + } |
| 101 | + |
| 102 | + private void invoke(String method) throws Exception { |
| 103 | + Method m = ServiceManager.class.getDeclaredMethod(method); |
| 104 | + m.setAccessible(true); |
| 105 | + m.invoke(ServiceManager.INSTANCE); |
| 106 | + } |
| 107 | +} |
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