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
228
229
230
231
232
233
234
|
// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.jdisc.core;
import com.google.inject.AbstractModule;
import com.google.inject.Injector;
import com.google.inject.Module;
import com.yahoo.jdisc.AbstractResource;
import com.yahoo.jdisc.application.Application;
import com.yahoo.jdisc.application.ApplicationNotReadyException;
import com.yahoo.jdisc.application.ContainerActivator;
import com.yahoo.jdisc.application.ContainerBuilder;
import com.yahoo.jdisc.application.DeactivatedContainer;
import com.yahoo.jdisc.application.GuiceRepository;
import com.yahoo.jdisc.application.OsgiFramework;
import com.yahoo.jdisc.application.OsgiHeader;
import com.yahoo.jdisc.service.ContainerNotReadyException;
import com.yahoo.jdisc.service.CurrentContainer;
import com.yahoo.jdisc.statistics.ContainerWatchdogMetrics;
import com.yahoo.log.LogSetup;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.BundleException;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicReference;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* @author Simon Thoresen Hult
* @author bjorncs
*/
public class ApplicationLoader implements BootstrapLoader, ContainerActivator, CurrentContainer {
private static final Logger log = Logger.getLogger(ApplicationLoader.class.getName());
private final OsgiFramework osgiFramework;
private final GuiceRepository guiceModules = new GuiceRepository();
private final AtomicReference<ActiveContainer> containerRef = new AtomicReference<>();
private final Object appLock = new Object();
private final List<Bundle> appBundles = new ArrayList<>();
private final ContainerWatchdog watchdog = new ContainerWatchdog();
private Application application;
private ApplicationInUseTracker applicationInUseTracker;
public ApplicationLoader(OsgiFramework osgiFramework, Iterable<? extends Module> guiceModules) {
LogSetup.initVespaLogging("Container");
this.osgiFramework = osgiFramework;
this.guiceModules.install(new ApplicationEnvironmentModule(this));
this.guiceModules.installAll(guiceModules);
}
@Override
public ContainerBuilder newContainerBuilder() {
return new ContainerBuilder(guiceModules);
}
@Override
public DeactivatedContainer activateContainer(ContainerBuilder builder) {
ActiveContainer next = builder != null ? new ActiveContainer(builder) : null;
final ActiveContainer prev;
synchronized (appLock) {
if (application == null && next != null) {
next.release();
throw new ApplicationNotReadyException();
}
if (next != null) {
next.retainReference(applicationInUseTracker);
}
watchdog.onContainerActivation(next);
prev = containerRef.getAndSet(next);
if (prev == null) {
return null;
}
}
prev.release();
return prev.shutdown();
}
@Override
public ContainerSnapshot newReference(URI uri, Object context) {
ActiveContainer container = containerRef.get();
if (container == null) {
throw new ContainerNotReadyException();
}
return container.newReference(uri, context);
}
@Override
public void init(String appLocation, boolean privileged) throws Exception {
log.finer("Initializing application loader.");
osgiFramework.start();
BundleContext ctx = osgiFramework.bundleContext();
if (ctx != null) {
ctx.registerService(CurrentContainer.class.getName(), this, null);
}
if(appLocation == null) {
return; // application class bound by another module
}
try {
Class<Application> appClass = ContainerBuilder.safeClassCast(Application.class, Class.forName(appLocation));
guiceModules.install(new AbstractModule() {
@Override
public void configure() {
bind(Application.class).to(appClass);
}
});
return; // application class found on class path
} catch (ClassNotFoundException e) {
// location is not a class name
if (log.isLoggable(Level.FINE)) {
log.fine("App location is not a class name. Installing bundle");
}
}
appBundles.addAll(osgiFramework.installBundle(appLocation));
if (OsgiHeader.isSet(appBundles.get(0), OsgiHeader.PRIVILEGED_ACTIVATOR)) {
osgiFramework.startBundles(appBundles, privileged);
}
}
@Override
public void start() throws Exception {
log.finer("Initializing application.");
watchdog.start();
Injector injector = guiceModules.activate();
Application app;
if (!appBundles.isEmpty()) {
Bundle appBundle = appBundles.get(0);
if (!OsgiHeader.isSet(appBundle, OsgiHeader.PRIVILEGED_ACTIVATOR)) {
osgiFramework.startBundles(appBundles, false);
}
List<String> header = OsgiHeader.asList(appBundle, OsgiHeader.APPLICATION);
if (header.size() != 1) {
throw new IllegalArgumentException("OSGi header '" + OsgiHeader.APPLICATION + "' has " + header.size() +
" entries, expected 1.");
}
String appName = header.get(0);
log.finer("Loading application class " + appName + " from bundle '" + appBundle.getSymbolicName() + "'.");
Class<Application> appClass = ContainerBuilder.safeClassCast(Application.class,
appBundle.loadClass(appName));
app = injector.getInstance(appClass);
} else {
app = injector.getInstance(Application.class);
log.finer("Injecting instance of " + app.getClass().getName() + ".");
}
try {
synchronized (appLock) {
application = app;
applicationInUseTracker = new ApplicationInUseTracker();
}
app.start();
} catch (Exception e) {
log.log(Level.WARNING, "Exception thrown while activating application.", e);
synchronized (appLock) {
application = null;
applicationInUseTracker = null;
}
app.destroy();
throw e;
}
}
@Override
public void stop() throws Exception {
log.finer("Destroying application.");
Application app;
ApplicationInUseTracker applicationInUseTracker;
synchronized (appLock) {
app = application;
applicationInUseTracker = this.applicationInUseTracker;
}
if (app == null || applicationInUseTracker == null) {
return;
}
try {
app.stop();
} catch (Exception e) {
log.log(Level.WARNING, "Exception thrown while deactivating application.", e);
}
synchronized (appLock) {
application = null;
}
activateContainer(null);
synchronized (appLock) {
this.applicationInUseTracker = null;
}
applicationInUseTracker.release();
applicationInUseTracker.applicationInUseLatch.await();
app.destroy();
}
@Override
public void destroy() {
log.finer("Destroying application loader.");
try {
watchdog.close();
osgiFramework.stop();
LogSetup.cleanup();
} catch (BundleException | InterruptedException e) {
e.printStackTrace();
}
}
public Application application() {
synchronized (appLock) {
return application;
}
}
public ContainerWatchdogMetrics getContainerWatchdogMetrics() {
return watchdog;
}
public OsgiFramework osgiFramework() {
return osgiFramework;
}
private static class ApplicationInUseTracker extends AbstractResource {
//opened when the application has been stopped and there's no active containers
final CountDownLatch applicationInUseLatch = new CountDownLatch(1);
@Override
protected void destroy() {
applicationInUseLatch.countDown();
}
}
}
|
