| 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.Iterator; |
| 23 | import java.util.List; |
| 24 | import java.util.Map; |
| 25 | import java.util.Set; |
| 26 | |
| 27 | import org.springframework.batch.repeat.RepeatContext; |
| 28 | |
| 29 | public class RepeatContextSupport extends SynchronizedAttributeAccessor implements RepeatContext { |
| 30 | |
| 31 | private RepeatContext parent; |
| 32 | |
| 33 | private int count; |
| 34 | |
| 35 | private volatile boolean completeOnly; |
| 36 | |
| 37 | private volatile boolean terminateOnly; |
| 38 | |
| 39 | private Map callbacks = new HashMap(); |
| 40 | |
| 41 | /** |
| 42 | * Constructor for {@link RepeatContextSupport}. The parent can be null, |
| 43 | * but should be set to the enclosing repeat context if there is one, e.g. |
| 44 | * if this context is an inner loop. |
| 45 | * @param parent |
| 46 | */ |
| 47 | public RepeatContextSupport(RepeatContext parent) { |
| 48 | super(); |
| 49 | this.parent = parent; |
| 50 | } |
| 51 | |
| 52 | /* |
| 53 | * (non-Javadoc) |
| 54 | * @see org.springframework.batch.repeat.RepeatContext#isCompleteOnly() |
| 55 | */ |
| 56 | public boolean isCompleteOnly() { |
| 57 | return completeOnly; |
| 58 | } |
| 59 | |
| 60 | /* |
| 61 | * (non-Javadoc) |
| 62 | * @see org.springframework.batch.repeat.RepeatContext#setCompleteOnly() |
| 63 | */ |
| 64 | public void setCompleteOnly() { |
| 65 | completeOnly = true; |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * (non-Javadoc) |
| 70 | * @see org.springframework.batch.repeat.RepeatContext#isTerminateOnly() |
| 71 | */ |
| 72 | public boolean isTerminateOnly() { |
| 73 | return terminateOnly; |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * (non-Javadoc) |
| 78 | * @see org.springframework.batch.repeat.RepeatContext#setTerminateOnly() |
| 79 | */ |
| 80 | public void setTerminateOnly() { |
| 81 | terminateOnly = true; |
| 82 | setCompleteOnly(); |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * (non-Javadoc) |
| 87 | * @see org.springframework.batch.repeat.RepeatContext#getParent() |
| 88 | */ |
| 89 | public RepeatContext getParent() { |
| 90 | return parent; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * Used by clients to increment the started count. |
| 95 | */ |
| 96 | public synchronized void increment() { |
| 97 | count++; |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * (non-Javadoc) |
| 102 | * @see org.springframework.batch.repeat.RepeatContext#getStartedCount() |
| 103 | */ |
| 104 | public synchronized int getStartedCount() { |
| 105 | return count; |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * (non-Javadoc) |
| 110 | * @see org.springframework.batch.repeat.RepeatContext#registerDestructionCallback(java.lang.String, |
| 111 | * java.lang.Runnable) |
| 112 | */ |
| 113 | public void registerDestructionCallback(String name, Runnable callback) { |
| 114 | synchronized (callbacks) { |
| 115 | Set set = (Set) callbacks.get(name); |
| 116 | if (set == null) { |
| 117 | set = new HashSet(); |
| 118 | callbacks.put(name, set); |
| 119 | } |
| 120 | set.add(callback); |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * (non-Javadoc) |
| 126 | * @see org.springframework.batch.repeat.RepeatContext#close() |
| 127 | */ |
| 128 | public void close() { |
| 129 | |
| 130 | List errors = new ArrayList(); |
| 131 | |
| 132 | Set copy; |
| 133 | |
| 134 | synchronized (callbacks) { |
| 135 | copy = new HashSet(callbacks.entrySet()); |
| 136 | } |
| 137 | |
| 138 | for (Iterator iter = copy.iterator(); iter.hasNext();) { |
| 139 | Map.Entry entry = (Map.Entry) iter.next(); |
| 140 | Set set = (Set) entry.getValue(); |
| 141 | for (Iterator iterator = set.iterator(); iterator.hasNext();) { |
| 142 | Runnable callback = (Runnable) iterator.next(); |
| 143 | /* |
| 144 | * Potentially we could check here if there is an attribute with |
| 145 | * the given name - if it has been removed, maybe the callback |
| 146 | * is invalid. On the other hand it is less surprising for the |
| 147 | * callback register if it is always executed. |
| 148 | */ |
| 149 | if (callback != null) { |
| 150 | /* |
| 151 | * The documentation of the interface says that these |
| 152 | * callbacks must not throw exceptions, but we don't trust |
| 153 | * them necessarily... |
| 154 | */ |
| 155 | try { |
| 156 | callback.run(); |
| 157 | } |
| 158 | catch (RuntimeException t) { |
| 159 | errors.add(t); |
| 160 | } |
| 161 | } |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | if (errors.isEmpty()) { |
| 166 | return; |
| 167 | } |
| 168 | |
| 169 | throw (RuntimeException) errors.get(0); |
| 170 | } |
| 171 | |
| 172 | } |