forked from mongodb/mongo-java-driver
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathBaseCluster.java
More file actions
227 lines (191 loc) · 9.05 KB
/
Copy pathBaseCluster.java
File metadata and controls
227 lines (191 loc) · 9.05 KB
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
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/*
* Copyright (c) 2008-2014 MongoDB, Inc.
*
* Licensed 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 com.mongodb;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicReference;
import java.util.logging.Logger;
import static java.lang.String.format;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import static java.util.concurrent.TimeUnit.NANOSECONDS;
import static org.bson.util.Assertions.isTrue;
import static org.bson.util.Assertions.notNull;
abstract class BaseCluster implements Cluster {
private static final Logger LOGGER = Loggers.getLogger("cluster");
private final AtomicReference<CountDownLatch> phase = new AtomicReference<CountDownLatch>(new CountDownLatch(1));
private final ClusterableServerFactory serverFactory;
private final ThreadLocal<Random> random = new ThreadLocal<Random>() {
@Override
protected Random initialValue() {
return new Random();
}
};
private final String clusterId;
private final ClusterSettings settings;
private final ClusterListener clusterListener;
private volatile boolean isClosed;
private volatile ClusterDescription description;
public BaseCluster(final String clusterId, final ClusterSettings settings, final ClusterableServerFactory serverFactory,
final ClusterListener clusterListener) {
this.clusterId = notNull("clusterId", clusterId);
this.settings = notNull("settings", settings);
this.serverFactory = notNull("serverFactory", serverFactory);
this.clusterListener = notNull("clusterListener", clusterListener);
clusterListener.clusterOpened(new ClusterEvent(clusterId));
}
@Override
public Server getServer(final ServerSelector serverSelector, final long maxWaitTime, final TimeUnit timeUnit) {
isTrue("open", !isClosed());
try {
CountDownLatch currentPhase = phase.get();
ClusterDescription curDescription = description;
List<ServerDescription> serverDescriptions = serverSelector.choose(curDescription);
final long endTime = System.nanoTime() + NANOSECONDS.convert(maxWaitTime, timeUnit);
while (true) {
throwIfIncompatible(curDescription);
if (!serverDescriptions.isEmpty()) {
ClusterableServer server = getRandomServer(new ArrayList<ServerDescription>(serverDescriptions));
if (server != null) {
return new WrappedServer(server);
}
}
if (!curDescription.isConnecting()) {
throw new MongoServerSelectionException(format("Unable to connect to any server that matches %s", serverSelector));
}
final long timeout = endTime - System.nanoTime();
LOGGER.info(format("No server chosen by %s from cluster description %s. Waiting for %d ms before timing out",
serverSelector, curDescription, MILLISECONDS.convert(timeout, NANOSECONDS)));
if (!currentPhase.await(timeout, NANOSECONDS)) {
throw new MongoTimeoutException(format("Timed out while waiting for a server that matches %s after %d ms",
serverSelector, MILLISECONDS.convert(timeout, NANOSECONDS)));
}
currentPhase = phase.get();
curDescription = description;
serverDescriptions = serverSelector.choose(curDescription);
}
} catch (InterruptedException e) {
throw new MongoInterruptedException(format("Interrupted while waiting for a server that matches %s ", serverSelector), e);
}
}
@Override
public ClusterDescription getDescription(final long maxWaitTime, final TimeUnit timeUnit) {
isTrue("open", !isClosed());
try {
CountDownLatch currentPhase = phase.get();
ClusterDescription curDescription = description;
final long endTime = System.nanoTime() + NANOSECONDS.convert(maxWaitTime, timeUnit);
while (curDescription.getType() == ClusterType.Unknown) {
if (!curDescription.isConnecting()) {
throw new MongoServerSelectionException(format("Unable to connect to any servers"));
}
final long timeout = endTime - System.nanoTime();
LOGGER.info(format("Cluster description not yet available. Waiting for %d ms before timing out",
MILLISECONDS.convert(timeout, NANOSECONDS)));
if (!currentPhase.await(timeout, NANOSECONDS)) {
throw new MongoTimeoutException(format("Timed out while waiting to connect after %d ms",
MILLISECONDS.convert(timeout, NANOSECONDS)));
}
currentPhase = phase.get();
curDescription = description;
}
return curDescription;
} catch (InterruptedException e) {
throw new MongoInterruptedException(format("Interrupted while waiting to connect"), e);
}
}
public ClusterSettings getSettings() {
return settings;
}
@Override
public void close() {
if (!isClosed()) {
isClosed = true;
serverFactory.close();
phase.get().countDown();
clusterListener.clusterClosed(new ClusterEvent(clusterId));
}
}
@Override
public boolean isClosed() {
return isClosed;
}
/**
* Return the server at the given address.
*
* @param serverAddress the address
* @return the server, or null if the cluster no longer contains a server at this address.
*/
protected abstract ClusterableServer getServer(final ServerAddress serverAddress);
protected synchronized void updateDescription(final ClusterDescription newDescription) {
LOGGER.fine(format("Updating cluster description to %s", newDescription.getShortDescription()));
description = newDescription;
final CountDownLatch current = phase.getAndSet(new CountDownLatch(1));
current.countDown();
}
protected void fireChangeEvent() {
clusterListener.clusterDescriptionChanged(new ClusterDescriptionChangedEvent(clusterId, description));
}
// gets a random server that still exists in the cluster. Returns null if there are none.
private ClusterableServer getRandomServer(final List<ServerDescription> serverDescriptions) {
while (!serverDescriptions.isEmpty()) {
int serverPos = getRandom().nextInt(serverDescriptions.size());
ClusterableServer server = getServer(serverDescriptions.get(serverPos).getAddress());
if (server != null) {
return server;
}
else {
serverDescriptions.remove(serverPos);
}
}
return null;
}
private void throwIfIncompatible(final ClusterDescription curDescription) {
if (!curDescription.isCompatibleWithDriver()) {
throw new MongoIncompatibleDriverException(format("This version of the driver is not compatible with one or more of the " +
"servers to which it is connected: %s", curDescription));
}
}
protected Random getRandom() {
return random.get();
}
protected ClusterableServer createServer(final ServerAddress serverAddress, final ChangeListener<ServerDescription>
serverStateListener) {
final ClusterableServer server = serverFactory.create(serverAddress);
server.addChangeListener(serverStateListener);
return server;
}
private static final class WrappedServer implements Server {
private final ClusterableServer wrapped;
public WrappedServer(final ClusterableServer server) {
wrapped = server;
}
@Override
public ServerDescription getDescription() {
return wrapped.getDescription();
}
@Override
public Connection getConnection(final long maxWaitTime, final TimeUnit timeUnit) {
return wrapped.getConnection(maxWaitTime, timeUnit);
}
@Override
public void invalidate() {
wrapped.invalidate();
}
}
}