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
182
183
184
185
186
187
188
189
190
191
192
193
194
195
|
/*
* 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.sca.core.store;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
import org.apache.tuscany.sca.core.event.BaseEventPublisher;
import org.apache.tuscany.sca.runtime.RuntimeComponent;
import org.apache.tuscany.sca.store.DuplicateRecordException;
import org.apache.tuscany.sca.store.RecoveryListener;
import org.apache.tuscany.sca.store.Store;
import org.apache.tuscany.sca.store.StoreExpirationEvent;
import org.apache.tuscany.sca.store.StoreMonitor;
import org.apache.tuscany.sca.store.StoreWriteException;
import org.osoa.sca.annotations.Destroy;
import org.osoa.sca.annotations.EagerInit;
import org.osoa.sca.annotations.Init;
import org.osoa.sca.annotations.Property;
import org.osoa.sca.annotations.Service;
/**
* Implements a non-durable, non-transactional store using a simple in-memory map
*
* @version $Rev$ $Date$
*/
@Service(Store.class)
@EagerInit
public class MemoryStore extends BaseEventPublisher implements Store {
private Map<RuntimeComponent, Map<String, Record>> store;
// TODO integrate with a core threading scheme
private ScheduledExecutorService scheduler;
private long reaperInterval = 300000;
private StoreMonitor monitor;
private long defaultExpirationOffset = 600000; // 10 minutes
public MemoryStore(StoreMonitor monitor) {
this.monitor = monitor;
this.store = new ConcurrentHashMap<RuntimeComponent, Map<String, Record>>();
this.scheduler = Executors.newSingleThreadScheduledExecutor();
}
/**
* Returns the maximum default expiration offset for records in the store
*
* @return the maximum default expiration offset for records in the store
*/
public long getDefaultExpirationOffset() {
return defaultExpirationOffset;
}
/**
* Sets the maximum default expiration offset for records in the store
*/
@Property
public void setDefaultExpirationOffset(long defaultExpirationOffset) {
this.defaultExpirationOffset = defaultExpirationOffset;
}
/**
* Sets the interval for expired entry scanning to be performed
*/
@Property
public void setReaperInterval(long reaperInterval) {
this.reaperInterval = reaperInterval;
}
public long getReaperInterval() {
return reaperInterval;
}
@Init
public void init() {
scheduler.scheduleWithFixedDelay(new Reaper(), reaperInterval, reaperInterval, TimeUnit.MILLISECONDS);
monitor.start("In-memory store started");
}
@Destroy
public void destroy() {
scheduler.shutdown();
monitor.stop("In-memory store stopped");
}
public void insertRecord(RuntimeComponent owner, String id, Object object, long expiration) throws StoreWriteException {
Map<String, Record> map = store.get(owner);
if (map == null) {
map = new ConcurrentHashMap<String, Record>();
store.put(owner, map);
}
if (map.containsKey(id)) {
throw new DuplicateRecordException("Duplicate record: " + owner.getURI() +" : " + id);
}
map.put(id, new Record(object, expiration));
}
public void updateRecord(RuntimeComponent owner, String id, Object object, long expiration) throws StoreWriteException {
Map<String, Record> map = store.get(owner);
if (map == null) {
throw new StoreWriteException("Record not found: " + owner.getURI() +" : " + id);
}
Record record = map.get(id);
if (record == null) {
throw new StoreWriteException("Record not found: " + owner.getURI() +" : " + id);
}
record.data = object;
}
public Object readRecord(RuntimeComponent owner, String id) {
Map<String, Record> map = store.get(owner);
if (map == null) {
return null;
}
Record record = map.get(id);
if (record != null) {
return record.data;
}
return null;
}
public void removeRecords() {
store.clear();
}
public void removeRecord(RuntimeComponent owner, String id) throws StoreWriteException {
Map<String, Record> map = store.get(owner);
if (map == null) {
throw new StoreWriteException("Owner not found: " + owner.getURI() +" : " + id);
}
if (map.remove(id) == null) {
throw new StoreWriteException("Owner not found: " + owner.getURI() +" : " + id);
}
}
public void recover(RecoveryListener listener) {
throw new UnsupportedOperationException();
}
private class Record {
private Object data;
private long expiration = NEVER;
public Record(Object data, long expiration) {
this.data = data;
this.expiration = expiration;
}
public Object getData() {
return data;
}
public long getExpiration() {
return expiration;
}
}
private class Reaper implements Runnable {
public void run() {
long now = System.currentTimeMillis();
for (Map.Entry<RuntimeComponent, Map<String, Record>> entries : store.entrySet()) {
for (Map.Entry<String, Record> entry : entries.getValue().entrySet()) {
final long expiration = entry.getValue().expiration;
if (expiration != NEVER && now >= expiration) {
RuntimeComponent owner = entries.getKey();
Object instance = entry.getValue().getData();
// notify listeners of the expiration
StoreExpirationEvent event = new StoreExpirationEvent(this, owner, instance);
publish(event);
entries.getValue().remove(entry.getKey());
}
}
}
}
}
}
|
