|
|||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
Registry.java | - | - | - | - |
|
1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.hivemind; | |
16 | ||
17 | import java.util.List; | |
18 | import java.util.Locale; | |
19 | ||
20 | /** | |
21 | * The HiveMind registry; primarily this is used to gain access to services. | |
22 | * <p> | |
23 | * In addition, Registry implements {@link org.apache.hivemind.SymbolSource} which allows | |
24 | * programatic access to substitution symbols. | |
25 | * | |
26 | * @author Howard Lewis Ship | |
27 | */ | |
28 | ||
29 | public interface Registry extends SymbolSource | |
30 | { | |
31 | /** | |
32 | * Returns true if a configuration for the specified id exists. | |
33 | * | |
34 | * @param configurationId | |
35 | * @return true if a configuration for the specified id exists | |
36 | */ | |
37 | public boolean containsConfiguration(String configurationId); | |
38 | ||
39 | /** | |
40 | * Returns true if a single service for the specified service interface class exists. | |
41 | * | |
42 | * @param serviceInterface | |
43 | * @return true if a single service for the specified service interface exists | |
44 | */ | |
45 | public boolean containsService(Class serviceInterface); | |
46 | ||
47 | /** | |
48 | * Returns true if a service for the specified service id and service interface exists. | |
49 | * | |
50 | * @param serviceId | |
51 | * @param serviceInterface | |
52 | * @return true if a service for the specified service id and service interface exists | |
53 | */ | |
54 | public boolean containsService(String serviceId, Class serviceInterface); | |
55 | ||
56 | /** | |
57 | * Returns a configuration as a List of elements (as defined by the schema for the configuration | |
58 | * point, or as {@link org.apache.hivemind.Element}s if no configuration point does not define | |
59 | * a schema. | |
60 | * | |
61 | * @param configurationId | |
62 | * the fully qualified id of the configuration to obtain | |
63 | * @return the configuration as an immutable List | |
64 | * @throws ApplicationRuntimeException | |
65 | * if the configuration does not exist, etc. | |
66 | */ | |
67 | public List getConfiguration(String configurationId); | |
68 | ||
69 | /** | |
70 | * Expands any substitution symbols in the input string, replacing each symbol with the symbols | |
71 | * value (if known). If a symbol is unknown, then the symbol is passed through unchanged | |
72 | * (complete with the <code>${</code> and <code>}</code> delimiters) and an error is logged. | |
73 | * | |
74 | * @param input | |
75 | * input string to be converted, which may (or may not) contain any symbols. | |
76 | * @param location | |
77 | * the location from which the string was obtained, used if an error is logged. | |
78 | */ | |
79 | ||
80 | public String expandSymbols(String input, Location location); | |
81 | ||
82 | /** | |
83 | * Obtains a service from the registry. Typically, what's returned is a proxy, but that's | |
84 | * irrelevant to the caller, which simply will invoke methods of the service interface. | |
85 | * | |
86 | * @param serviceId | |
87 | * the fully qualified id of the service to obtain | |
88 | * @param serviceInterface | |
89 | * the class to which the service will be cast | |
90 | * @return the service | |
91 | * @throws ApplicationRuntimeException | |
92 | * if the service does not exist, or if it can't be cast to the specified service | |
93 | * interface | |
94 | */ | |
95 | ||
96 | public Object getService(String serviceId, Class serviceInterface); | |
97 | ||
98 | /** | |
99 | * Convenience method to obtain a service with a single implementation from the registry. | |
100 | * Exactly one service point must implement the service. | |
101 | * | |
102 | * @param serviceInterface | |
103 | * the class to which the service will be cast. | |
104 | * @return the service implementing the given interface. | |
105 | * @throws ApplicationRuntimeException | |
106 | * if there are no service extension points implementing the given interface, or if | |
107 | * there multiple service points implementing it. | |
108 | * @see #getService(String, Class) | |
109 | */ | |
110 | ||
111 | public Object getService(Class serviceInterface); | |
112 | ||
113 | /** | |
114 | * Returns the locale for which the registry was created. | |
115 | */ | |
116 | ||
117 | public Locale getLocale(); | |
118 | ||
119 | /** | |
120 | * Shuts down the registry; this notifies all | |
121 | * {@link org.apache.hivemind.events.RegistryShutdownListener} services and objects. Once | |
122 | * the registry is shutdown, it is no longer valid to obtain new services or configurations, or | |
123 | * even use existing services and configurations. | |
124 | */ | |
125 | ||
126 | public void shutdown(); | |
127 | ||
128 | /** | |
129 | * To be invoked at the start of each request in a multi-threaded environment. Ensures that the | |
130 | * receiving Registry will be used if any service proxies are de-serialized. | |
131 | * | |
132 | * @since 3.1 | |
133 | * @see org.apache.hivemind.internal.ser.ServiceSerializationHelper | |
134 | * @see org.apache.hivemind.internal.ser.ServiceSerializationSupport | |
135 | */ | |
136 | ||
137 | public void setupThread(); | |
138 | ||
139 | /** | |
140 | * Convienience for invoking | |
141 | * {@link org.apache.hivemind.service.ThreadEventNotifier#fireThreadCleanup()}. | |
142 | */ | |
143 | ||
144 | public void cleanupThread(); | |
145 | ||
146 | /** | |
147 | * Returns a list of service ids for service points which implement | |
148 | * the desired service interface. | |
149 | * | |
150 | * @return Returns an empty List if no matching service points exist. | |
151 | * @since 1.1 | |
152 | */ | |
153 | public List getServiceIds( Class serviceInterface ); | |
154 | ||
155 | /** | |
156 | * Returns the Messages object for the specified module. | |
157 | * @param moduleId the module id | |
158 | * @return the Messages object for the specified module. | |
159 | */ | |
160 | public Messages getModuleMessages( String moduleId ); | |
161 | } |
|