1 | /* |
2 | * Copyright 2006-2007 the original author or authors. |
3 | * |
4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. |
6 | * You may obtain a copy of the License at |
7 | * |
8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * |
10 | * Unless required by applicable law or agreed to in writing, software |
11 | * distributed under the License is distributed on an "AS IS" BASIS, |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | * See the License for the specific language governing permissions and |
14 | * limitations under the License. |
15 | */ |
16 | |
17 | package org.springframework.batch.repeat.context; |
18 | |
19 | import java.util.ArrayList; |
20 | import java.util.HashMap; |
21 | import java.util.HashSet; |
22 | import java.util.List; |
23 | import java.util.Map; |
24 | import java.util.Set; |
25 | |
26 | import org.springframework.batch.repeat.RepeatContext; |
27 | |
28 | public class RepeatContextSupport extends SynchronizedAttributeAccessor implements RepeatContext { |
29 | |
30 | private RepeatContext parent; |
31 | |
32 | private int count; |
33 | |
34 | private volatile boolean completeOnly; |
35 | |
36 | private volatile boolean terminateOnly; |
37 | |
38 | private Map<String, Set<Runnable>> callbacks = new HashMap<String, Set<Runnable>>(); |
39 | |
40 | /** |
41 | * Constructor for {@link RepeatContextSupport}. The parent can be null, but |
42 | * should be set to the enclosing repeat context if there is one, e.g. if |
43 | * this context is an inner loop. |
44 | * @param parent |
45 | */ |
46 | public RepeatContextSupport(RepeatContext parent) { |
47 | super(); |
48 | this.parent = parent; |
49 | } |
50 | |
51 | /* |
52 | * (non-Javadoc) |
53 | * |
54 | * @see org.springframework.batch.repeat.RepeatContext#isCompleteOnly() |
55 | */ |
56 | @Override |
57 | public boolean isCompleteOnly() { |
58 | return completeOnly; |
59 | } |
60 | |
61 | /* |
62 | * (non-Javadoc) |
63 | * |
64 | * @see org.springframework.batch.repeat.RepeatContext#setCompleteOnly() |
65 | */ |
66 | @Override |
67 | public void setCompleteOnly() { |
68 | completeOnly = true; |
69 | } |
70 | |
71 | /* |
72 | * (non-Javadoc) |
73 | * |
74 | * @see org.springframework.batch.repeat.RepeatContext#isTerminateOnly() |
75 | */ |
76 | @Override |
77 | public boolean isTerminateOnly() { |
78 | return terminateOnly; |
79 | } |
80 | |
81 | /* |
82 | * (non-Javadoc) |
83 | * |
84 | * @see org.springframework.batch.repeat.RepeatContext#setTerminateOnly() |
85 | */ |
86 | @Override |
87 | public void setTerminateOnly() { |
88 | terminateOnly = true; |
89 | setCompleteOnly(); |
90 | } |
91 | |
92 | /* |
93 | * (non-Javadoc) |
94 | * |
95 | * @see org.springframework.batch.repeat.RepeatContext#getParent() |
96 | */ |
97 | @Override |
98 | public RepeatContext getParent() { |
99 | return parent; |
100 | } |
101 | |
102 | /** |
103 | * Used by clients to increment the started count. |
104 | */ |
105 | public synchronized void increment() { |
106 | count++; |
107 | } |
108 | |
109 | /* |
110 | * (non-Javadoc) |
111 | * |
112 | * @see org.springframework.batch.repeat.RepeatContext#getStartedCount() |
113 | */ |
114 | @Override |
115 | public synchronized int getStartedCount() { |
116 | return count; |
117 | } |
118 | |
119 | /* |
120 | * (non-Javadoc) |
121 | * |
122 | * @see |
123 | * org.springframework.batch.repeat.RepeatContext#registerDestructionCallback |
124 | * (java.lang.String, java.lang.Runnable) |
125 | */ |
126 | @Override |
127 | public void registerDestructionCallback(String name, Runnable callback) { |
128 | synchronized (callbacks) { |
129 | Set<Runnable> set = callbacks.get(name); |
130 | if (set == null) { |
131 | set = new HashSet<Runnable>(); |
132 | callbacks.put(name, set); |
133 | } |
134 | set.add(callback); |
135 | } |
136 | } |
137 | |
138 | /* |
139 | * (non-Javadoc) |
140 | * |
141 | * @see org.springframework.batch.repeat.RepeatContext#close() |
142 | */ |
143 | @Override |
144 | public void close() { |
145 | |
146 | List<RuntimeException> errors = new ArrayList<RuntimeException>(); |
147 | |
148 | Set<Map.Entry<String, Set<Runnable>>> copy; |
149 | |
150 | synchronized (callbacks) { |
151 | copy = new HashSet<Map.Entry<String, Set<Runnable>>>(callbacks.entrySet()); |
152 | } |
153 | |
154 | for (Map.Entry<String, Set<Runnable>> entry : copy) { |
155 | |
156 | for (Runnable callback : entry.getValue()) { |
157 | /* |
158 | * Potentially we could check here if there is an attribute with |
159 | * the given name - if it has been removed, maybe the callback |
160 | * is invalid. On the other hand it is less surprising for the |
161 | * callback register if it is always executed. |
162 | */ |
163 | if (callback != null) { |
164 | /* |
165 | * The documentation of the interface says that these |
166 | * callbacks must not throw exceptions, but we don't trust |
167 | * them necessarily... |
168 | */ |
169 | try { |
170 | callback.run(); |
171 | } |
172 | catch (RuntimeException t) { |
173 | errors.add(t); |
174 | } |
175 | } |
176 | } |
177 | } |
178 | |
179 | if (errors.isEmpty()) { |
180 | return; |
181 | } |
182 | |
183 | throw (RuntimeException) errors.get(0); |
184 | } |
185 | |
186 | } |