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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
|
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.resolver;
import java.net.URI;
import java.util.HashMap;
import java.util.Map;
import org.apache.tuscany.spi.model.ComponentDefinition;
import org.apache.tuscany.spi.model.ComponentType;
import org.apache.tuscany.spi.model.CompositeComponentType;
import org.apache.tuscany.spi.model.Implementation;
import org.apache.tuscany.spi.model.ReferenceDefinition;
import org.apache.tuscany.spi.model.ReferenceTarget;
import org.apache.tuscany.spi.model.ServiceContract;
import org.apache.tuscany.spi.model.ServiceDefinition;
import org.apache.tuscany.spi.resolver.ResolutionException;
/**
* Default implementation of an autowire resolver
*
* @version $Rev$ $Date$
*/
public class DefaultAutowireResolver implements AutowireResolver {
private Map<ServiceContract, URI> hostAutowire = new HashMap<ServiceContract, URI>();
@SuppressWarnings({"unchecked"})
public void resolve(ComponentDefinition<Implementation<CompositeComponentType<?, ?, ?>>> parentDefinition,
ComponentDefinition<? extends Implementation<?>> definition)
throws ResolutionException {
ComponentType<?, ?, ?> type = definition.getImplementation().getComponentType();
// resolve autowires
if (type instanceof CompositeComponentType) {
CompositeComponentType<?, ?, ?> compositeType = (CompositeComponentType<?, ?, ?>) type;
for (ComponentDefinition<? extends Implementation<?>> child : compositeType.getComponents().values()) {
Implementation<?> implementation = child.getImplementation();
ComponentType<?, ?, ?> childType = implementation.getComponentType();
if (childType instanceof CompositeComponentType) {
// recurse decendents for composites
resolve((ComponentDefinition<Implementation<CompositeComponentType<?, ?, ?>>>) definition, child);
}
Map<String, ReferenceTarget> targets = child.getReferenceTargets();
for (ReferenceDefinition reference : childType.getReferences().values()) {
ReferenceTarget target = targets.get(reference.getUri().getFragment());
if (target == null) {
continue;
}
if (target.isAutowire()) {
ServiceContract requiredContract = reference.getServiceContract();
resolve(compositeType, requiredContract, target, reference.isRequired());
}
}
}
} else {
// a leaf level component
ComponentType<?, ?, ?> componentType = definition.getImplementation().getComponentType();
Map<String, ReferenceTarget> targets = definition.getReferenceTargets();
for (ReferenceDefinition reference : componentType.getReferences().values()) {
ReferenceTarget target = targets.get(reference.getUri().getFragment());
if (target == null) {
continue;
}
if (target.isAutowire()) {
ServiceContract requiredContract = reference.getServiceContract();
CompositeComponentType<?, ?, ?> ctype = parentDefinition.getImplementation().getComponentType();
resolve(ctype, requiredContract, target, reference.isRequired());
}
}
}
}
public void addHostUri(ServiceContract contract, URI uri) {
hostAutowire.put(contract, uri);
}
public void resolve(CompositeComponentType<?, ?, ?> compositeType) throws ResolutionException {
for (ComponentDefinition<? extends Implementation<?>> child : compositeType.getComponents().values()) {
Implementation<?> implementation = child.getImplementation();
ComponentType<?, ?, ?> childType = implementation.getComponentType();
if (childType instanceof CompositeComponentType) {
// recurse decendents for composites
resolve(null, child);
}
Map<String, ReferenceTarget> targets = child.getReferenceTargets();
for (ReferenceDefinition reference : childType.getReferences().values()) {
ReferenceTarget target = targets.get(reference.getUri().getFragment());
if (target == null) {
continue;
}
if (target.isAutowire()) {
ServiceContract requiredContract = reference.getServiceContract();
resolve(compositeType, requiredContract, target, reference.isRequired());
}
}
}
}
/**
* Performs the actual resolution against a composite TODO this should be extensible allowing for path
* optimizations
*
* @param compositeType the composite component type to resolve against
* @param requiredContract the required target contract
* @param target the reference target
* @param required true if the autowire is required
* @throws AutowireTargetNotFoundException
*
*/
private void resolve(CompositeComponentType<?, ?, ?> compositeType,
ServiceContract requiredContract,
ReferenceTarget target,
boolean required) throws AutowireTargetNotFoundException {
// for now, attempt to match on interface, assume the class can be loaded
Class<?> requiredInterface = requiredContract.getInterfaceClass();
if (requiredInterface == null) {
throw new UnsupportedOperationException("Only interfaces support for autowire");
}
// autowire to a target in the parent
URI targetUri = null;
URI candidateUri = null;
// find a suitable target, starting with components first
for (ComponentDefinition<? extends Implementation<?>> candidate : compositeType.getComponents().values()) {
Implementation<?> candidateImpl = candidate.getImplementation();
ComponentType<?, ?, ?> candidateType = candidateImpl.getComponentType();
for (ServiceDefinition service : candidateType.getServices().values()) {
Class<?> serviceInterface = service.getServiceContract().getInterfaceClass();
if (serviceInterface == null) {
continue;
}
if (requiredInterface.equals(serviceInterface)) {
targetUri = URI.create(candidate.getUri().toString() + service.getUri());
break;
} else if (candidateUri == null && requiredInterface.isAssignableFrom(serviceInterface)) {
candidateUri = URI.create(candidate.getUri().toString() + service.getUri());
}
}
if (targetUri != null) {
break;
}
}
if (targetUri == null) {
targetUri = resolvePrimordial(requiredContract);
}
if (candidateUri != null) {
targetUri = candidateUri;
}
if (targetUri != null) {
target.addTarget(targetUri);
}
if (targetUri == null && required) {
String uri = target.getReferenceName().toString();
throw new AutowireTargetNotFoundException("No suitable target found for", uri);
}
}
private URI resolvePrimordial(ServiceContract contract) {
Class<?> requiredClass = contract.getInterfaceClass();
for (Map.Entry<ServiceContract, URI> entry : hostAutowire.entrySet()) {
if (requiredClass.isAssignableFrom(entry.getKey().getInterfaceClass())) {
return entry.getValue();
}
}
return null;
}
}
|
