1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
|
/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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 CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.tuscany.core.system.context;
import org.apache.tuscany.core.builder.ObjectFactory;
import org.apache.tuscany.core.injection.EventInvoker;
import org.apache.tuscany.core.injection.ObjectCallbackException;
import org.apache.tuscany.core.injection.ObjectCreationException;
import org.apache.tuscany.core.context.AtomicContext;
import org.apache.tuscany.core.context.impl.AbstractContext;
import org.apache.tuscany.core.context.TargetException;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.ContextInitException;
import org.apache.tuscany.core.context.event.InstanceCreated;
/**
* Manages system component implementation instances
*
* @version $Rev$ $Date$
*/
public class SystemAtomicContext extends AbstractContext implements AtomicContext {
private boolean eagerInit;
private EventInvoker<Object> initInvoker;
private EventInvoker<Object> destroyInvoker;
private boolean stateless;
// the cached target instance
private Object cachedTargetInstance;
// responsible for creating a new implementation instance with injected references and properties
private ObjectFactory objectFactory;
public SystemAtomicContext(String name, ObjectFactory objectFactory, boolean eagerInit, EventInvoker<Object> initInvoker,
EventInvoker<Object> destroyInvoker, boolean stateless) {
super(name);
assert (objectFactory != null) : "Object factory was null";
if (eagerInit && initInvoker == null) {
throw new AssertionError("No intialization method found for eager init implementation");
}
this.objectFactory = objectFactory;
this.eagerInit = eagerInit;
this.initInvoker = initInvoker;
this.destroyInvoker = destroyInvoker;
this.stateless = stateless;
}
public void setName(String name) {
super.setName(name);
}
protected int type;
public int getType() {
return type;
}
public void setType(int type) {
this.type = type;
}
public void init() throws TargetException{
getInstance(null);
}
public void destroy() throws TargetException {
if (cachedTargetInstance != null) {
if (destroyInvoker != null) {
try {
destroyInvoker.invokeEvent(cachedTargetInstance);
} catch (ObjectCallbackException e) {
throw new TargetException(e.getCause());
}
}
}
lifecycleState = STARTED;
}
public synchronized Object getInstance(QualifiedName qName) throws TargetException {
if (cachedTargetInstance != null) {
return cachedTargetInstance; // already cached, just return
}
if (getLifecycleState() == ERROR || getLifecycleState() == CONFIG_ERROR) {
return null;
}
synchronized (this) {
try {
Object instance = objectFactory.getInstance();
// handle @Init
if (initInvoker != null) {
initInvoker.invokeEvent(instance);
}
publish(new InstanceCreated(this));
lifecycleState = RUNNING;
if (stateless) {
return instance;
} else {
// cache the actual instance
cachedTargetInstance = instance;
return cachedTargetInstance;
}
} catch (ObjectCreationException e) {
lifecycleState = ERROR;
TargetException te = new TargetException("Error creating component instance", e);
te.setIdentifier(getName());
throw te;
}
}
}
public Object getTargetInstance() throws TargetException {
return getInstance(null);
}
public boolean isEagerInit() {
return eagerInit;
}
public boolean isDestroyable() {
return (destroyInvoker != null);
}
public void start() throws ContextInitException {
if (getLifecycleState() != UNINITIALIZED && getLifecycleState() != STOPPED) {
throw new IllegalStateException("Component must be in UNINITIALIZED state [" + getLifecycleState() + "]");
}
if (objectFactory == null) {
lifecycleState = ERROR;
ContextInitException e = new ContextInitException("Object factory not found ");
e.setIdentifier(getName());
throw e;
}
lifecycleState = INITIALIZED;
}
public void stop() {
lifecycleState = STOPPED;
}
}
|
