Method: activatorFor(Class)

1: /*
2: * *************************************************************************************************************************************************************
3: *
4: * TheseFoolishThings: Miscellaneous utilities
5: * http://tidalwave.it/projects/thesefoolishthings
6: *
7: * Copyright (C) 2009 - 2024 by Tidalwave s.a.s. (http://tidalwave.it)
8: *
9: * *************************************************************************************************************************************************************
10: *
11: * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License.
12: * You may obtain a copy of the License at
13: *
14: * http://www.apache.org/licenses/LICENSE-2.0
15: *
16: * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
17: * CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.
18: *
19: * *************************************************************************************************************************************************************
20: *
21: * git clone https://bitbucket.org/tidalwave/thesefoolishthings-src
22: * git clone https://github.com/tidalwave-it/thesefoolishthings-src
23: *
24: * *************************************************************************************************************************************************************
25: */
26: package it.tidalwave.actor.spi;
27:
28: import java.lang.reflect.InvocationTargetException;
29: import javax.annotation.Nonnegative;
30: import javax.annotation.Nonnull;
31: import it.tidalwave.actor.annotation.Actor;
32: import it.tidalwave.actor.impl.CollaborationAwareMessageBusAdapter;
33: import it.tidalwave.actor.impl.ExecutorWithPriority;
34: import it.tidalwave.actor.impl.MBeansManager;
35: import it.tidalwave.actor.impl.PostConstructInvoker;
36: import it.tidalwave.actor.impl.PreDestroyInvoker;
37: import lombok.Getter;
38: import lombok.extern.slf4j.Slf4j;
39: import static it.tidalwave.messagebus.spi.ReflectionUtils.*;
40:
41: /***************************************************************************************************************************************************************
42: *
43: * This class is used to activate and deactivate an actor.
44: *
45: * @author Fabrizio Giudici
46: *
47: **************************************************************************************************************************************************************/
48: @Slf4j
49: public class ActorActivator
50: {
51: @Nonnull
52: private final Class<?> actorClass;
53:
54: @Nonnegative @Getter
55: private final int poolSize;
56:
57: @Getter
58: private Object actorObject;
59:
60: private ExecutorWithPriority executor;
61:
62: private CollaborationAwareMessageBusAdapter messageBusAdapter;
63:
64: private MBeansManager mBeansManager;
65:
66: /***********************************************************************************************************************************************************
67: * Creates an instance for the given actor class.
68: *
69: * @param actorClass the actor class
70: * @return the instance
71: **********************************************************************************************************************************************************/
72: public static ActorActivator activatorFor (@Nonnull final Class<?> actorClass)
73: {
74: return new ActorActivator(actorClass, 1);
75: }
76:
77: /***********************************************************************************************************************************************************
78: * Specifies the pool size for this activator.
79: *
80: * @param poolSize the pool size
81: * @return the activator
82: **********************************************************************************************************************************************************/
83: @Nonnull
84: public ActorActivator withPoolSize (@Nonnegative final int poolSize)
85: {
86: return new ActorActivator(actorClass, poolSize);
87: }
88:
89: /***********************************************************************************************************************************************************
90: *
91: **********************************************************************************************************************************************************/
92: private ActorActivator (@Nonnull final Class<?> actorClass, @Nonnegative final int poolSize)
93: {
94: this.actorClass = actorClass;
95: this.poolSize = poolSize;
96: }
97:
98: /***********************************************************************************************************************************************************
99: * Activates the managed actor.
100: **********************************************************************************************************************************************************/
101: public void initialize()
102: {
103: try
104: {
105: final var actor = actorClass.getAnnotation(Actor.class);
106: validate(actor);
107: actorObject = actorClass.getDeclaredConstructor().newInstance();
108: executor = new ExecutorWithPriority(poolSize, actorClass.getSimpleName(), actor.initialPriority());
109: mBeansManager = new MBeansManager(actorObject, poolSize);
110: messageBusAdapter = new CollaborationAwareMessageBusAdapter(actorObject, executor, mBeansManager.getStats());
111: }
112: catch (InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e)
113: {
114: throw new RuntimeException(e);
115: }
116:
117: forEachMethodInTopDownHierarchy(actorObject, messageBusAdapter);
118: forEachMethodInTopDownHierarchy(actorObject, new PostConstructInvoker(actorObject));
119: mBeansManager.register();
120: }
121:
122: /***********************************************************************************************************************************************************
123: * Deactivates the managed actor and releases resources.
124: **********************************************************************************************************************************************************/
125: public void dispose()
126: {
127: mBeansManager.unregister();
128: forEachMethodInBottomUpHierarchy(actorObject, new PreDestroyInvoker(actorObject));
129: messageBusAdapter.unsubscribe();
130: }
131:
132: /***********************************************************************************************************************************************************
133: *
134: **********************************************************************************************************************************************************/
135: private void validate (@Nonnull final Actor actor)
136: {
137: //noinspection ConstantConditions
138: if (actor == null)
139: {
140: throw new IllegalArgumentException("Actor class must be annotated with @Actor: " + actorClass);
141: }
142:
143: if (!actor.threadSafe() && (poolSize != 1))
144: {
145: throw new IllegalArgumentException("Actors that aren't thread safe can't have pool size > 1");
146: }
147: }
148: }