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
|
/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2020-2021 Nordix Foundation.
* Modifications Copyright (C) 2021 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.policy.gui.pdp.monitoring;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import lombok.Getter;
import lombok.ToString;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* The main class for Pdp Statistics Monitoring.
*
* @author Yehui Wang (yehui.wang@est.tech)
*/
@ToString
public class PdpMonitoringMain {
// Logger for this class
private static final Logger LOGGER = LoggerFactory.getLogger(PdpMonitoringMain.class);
// Recurring string constants
private static final String PDP_MONITORING_PREFIX = "Pdp Monitoring GUI (";
// Services state
public enum ServicesState {
STOPPED, READY, INITIALIZING, RUNNING
}
@Getter
private ServicesState state = ServicesState.STOPPED;
// The parameters for the Server
private PdpMonitoringServerParameters parameters = null;
// The Pdp Monitoring services this class is running
private PdpMonitoringServer pdpMonitoringServer = null;
private CountDownLatch startedLatch = new CountDownLatch(1);
private CountDownLatch shutdownLatch = new CountDownLatch(1);
/**
* Constructor, kicks off the GUI service.
*
* @param args The command line arguments for the RESTful service
*/
public PdpMonitoringMain(final String[] args) {
// Server parameter parsing
final var parser = new PdpMonitoringServerParameterParser();
try {
// Get and check the parameters
parameters = parser.parse(args);
} catch (final PdpMonitoringServerParameterException e) {
throw new PdpMonitoringServerParameterException(PDP_MONITORING_PREFIX + this + ") parameter error, "
+ e.getMessage() + '\n' + parser.getHelp(PdpMonitoringMain.class.getName()), e);
}
if (parameters.isHelpSet()) {
throw new PdpMonitoringServerParameterException(parser.getHelp(PdpMonitoringMain.class.getName()));
}
// Validate the parameters
final var validationResult = parameters.validate();
if (!validationResult.isValid()) {
throw new PdpMonitoringServerParameterException(
PDP_MONITORING_PREFIX + this + ") parameters invalid, " + validationResult.getResult() + '\n'
+ parser.getHelp(PdpMonitoringMain.class.getName()));
}
state = ServicesState.READY;
}
/**
* Initialize the rest service.
*/
public void init() {
LOGGER.info(PDP_MONITORING_PREFIX + "{}) starting at {} . . .", this, parameters.getBaseUri());
try {
state = ServicesState.INITIALIZING;
// Start the Pdp Monitoring service
pdpMonitoringServer = new PdpMonitoringServer(parameters);
// Add a shutdown hook to shut down the servlet services when the process is exiting
Runtime.getRuntime().addShutdownHook(new Thread(this::shutdown));
state = ServicesState.RUNNING;
if (parameters.getTimeToLive() == PdpMonitoringServerParameters.INFINITY_TIME_TO_LIVE) {
LOGGER.info(PDP_MONITORING_PREFIX + "{}) starting at {} . . .", this, parameters.getTimeToLive());
} else {
LOGGER.info(PDP_MONITORING_PREFIX + "{}) started", this);
}
startedLatch.countDown();
// Find out how long is left to wait
long timeRemaining = parameters.getTimeToLive();
if (timeRemaining >= 0) {
if (!shutdownLatch.await(timeRemaining, TimeUnit.SECONDS)) {
shutdown();
}
} else {
shutdownLatch.await();
}
} catch (final Exception e) {
LOGGER.warn("{} failed with error", this, e);
} finally {
shutdown();
}
}
/**
* Waits for the service to enter the running state.
*
* @param timeout time to wait
* @param unit time units
* @return {@code true} if the service started within the specified time
* @throws InterruptedException if an interrupt occurs
*/
protected boolean awaitStart(long timeout, TimeUnit unit) throws InterruptedException {
return startedLatch.await(timeout, unit);
}
/**
* Explicitly shut down the services.
*/
public void shutdown() {
if (pdpMonitoringServer != null) {
LOGGER.info(PDP_MONITORING_PREFIX + "{}) shutting down", this);
pdpMonitoringServer.shutdown(parameters.getPort());
}
shutdownLatch.countDown();
state = ServicesState.STOPPED;
LOGGER.info(PDP_MONITORING_PREFIX + "{}) shutting down", this);
}
/**
* Main method, main entry point for command.
*
* @param args The command line arguments for the GUI
*/
public static void main(final String[] args) {
try {
final var main = new PdpMonitoringMain(args);
main.init();
} catch (final Exception e) {
LOGGER.error("start failed", e);
}
}
}
|
