blob: 85d72b4b0d83a1632874ead2f9f05505a6ae430f (
plain)
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
|
/**
*
* 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.container.java.invocation;
import org.apache.tuscany.core.context.QualifiedName;
import org.apache.tuscany.core.context.ScopeContext;
import org.apache.tuscany.core.context.TargetException;
import java.lang.reflect.Method;
/**
* Uses a scope container to resolve an implementation instance based on the current thread context
*
* @version $Rev$ $Date$
*/
public class ScopedJavaComponentInvoker extends AbstractJavaComponentInvoker {
private ScopeContext container;
private QualifiedName name;
private Object target;
public boolean cacheable;
/**
* Creates a new invoker
*
* @param serviceName the name of the component/service pair to invoke
* @param operation the operation the invoker is associated with
* @param scopeContext the scope context the component is resolved in
* @param cacheable Sets whether the target service instance may be cached by the invoker. This is a possible optimization
* when a wire is configured for a "down-scope" reference, i.e. a reference from a source of a shorter
* lifetime to a source of greater lifetime.
*/
public ScopedJavaComponentInvoker(QualifiedName serviceName, Method operation, ScopeContext scopeContext, boolean cacheable) {
super(operation);
assert (serviceName != null) : "No service name specified";
assert (scopeContext != null) : "No scope scopeContext specified";
name = serviceName;
this.container = scopeContext;
this.cacheable = cacheable;
}
/**
* Returns whether the target is cacheable.
*/
public boolean isCacheable() {
return cacheable;
}
/**
* Resolves the target service instance or returns a cached one
*/
protected Object getInstance() throws TargetException {
if (!cacheable) {
return container.getInstance(name);
} else {
if (target == null) {
target = container.getInstance(name);
}
return target;
}
}
public Object clone() throws CloneNotSupportedException {
ScopedJavaComponentInvoker invoker = (ScopedJavaComponentInvoker) super.clone();
invoker.target = null;
invoker.cacheable = this.cacheable;
invoker.container = this.container;
invoker.name = this.name;
return invoker;
}
}
|
