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
|
/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2018 Intel Corp. All rights reserved.
* Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* 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.distribution.reception.handling.file;
import static java.nio.file.StandardWatchEventKinds.ENTRY_CREATE;
import java.io.File;
import java.io.IOException;
import java.nio.file.FileSystems;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.WatchEvent;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.zip.ZipFile;
import org.onap.policy.common.parameters.ParameterService;
import org.onap.policy.distribution.model.Csar;
import org.onap.policy.distribution.reception.decoding.PolicyDecodingException;
import org.onap.policy.distribution.reception.handling.AbstractReceptionHandler;
import org.onap.policy.distribution.reception.statistics.DistributionStatisticsManager;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Handles reception of inputs from File System which can be used to decode policies.
*/
public class FileSystemReceptionHandler extends AbstractReceptionHandler {
private static final Logger LOGGER = LoggerFactory.getLogger(FileSystemReceptionHandler.class);
private boolean running = false;
/**
* {@inheritDoc}.
*/
@Override
protected void initializeReception(final String parameterGroupName) {
LOGGER.debug("FileSystemReceptionHandler init...");
try {
final FileSystemReceptionHandlerConfigurationParameterGroup handlerParameters =
ParameterService.get(parameterGroupName);
final FileClientHandler fileClientHandler = new FileClientHandler(this,
handlerParameters.getWatchPath(),
handlerParameters.getMaxThread());
final Thread fileWatcherThread = new Thread(fileClientHandler);
fileWatcherThread.start();
} catch (final Exception ex) {
LOGGER.error("FileSystemReceptionHandler initialization failed", ex);
}
}
/**
* {@inheritDoc}.
*/
@Override
public void destroy() {
running = false;
}
/**
* Method to check the running status of file watcher thread.
*
* @return the running status
*/
public boolean isRunning() {
return running;
}
/**
* Initialize the file watcher thread.
*
* @param watchPath Path to watch
*/
public void initFileWatcher(final String watchPath, final int maxThread) throws IOException {
try (final WatchService watcher = FileSystems.getDefault().newWatchService()) {
final Path dir = Paths.get(watchPath);
dir.register(watcher, ENTRY_CREATE);
LOGGER.debug("Watch Service registered for dir: {}", dir.getFileName());
startWatchService(watcher, dir, maxThread);
} catch (final Exception ex) {
LOGGER.error("FileWatcher initialization failed", ex);
Thread.currentThread().interrupt();
}
}
/**
* Method to keep watching the given path for any new file created.
*
* @param watcher the watcher
* @param dir the watch directory
* @param maxThread the max thread number
* @throws InterruptedException if it occurs
*/
@SuppressWarnings("unchecked")
protected void startWatchService(final WatchService watcher,
final Path dir, int maxThread) throws InterruptedException {
WatchKey key;
ExecutorService pool = Executors.newFixedThreadPool(maxThread);
try {
running = true;
while (running) {
key = watcher.take();
processFileEvents(dir, key, pool);
final boolean valid = key.reset();
if (!valid) {
LOGGER.error("Watch key no longer valid!");
break;
}
}
} finally {
pool.shutdown();
}
}
private void processFileEvents(Path dir, WatchKey key, ExecutorService pool) {
for (final WatchEvent<?> event : key.pollEvents()) {
final WatchEvent<Path> ev = (WatchEvent<Path>) event;
final Path fileName = ev.context();
pool.execute(() -> {
LOGGER.debug("new CSAR found: {}", fileName);
DistributionStatisticsManager.updateTotalDistributionCount();
final String fullFilePath = dir.toString() + File.separator + fileName.toString();
try {
waitForFileToBeReady(fullFilePath);
createPolicyInputAndCallHandler(fullFilePath);
LOGGER.debug("CSAR complete: {}", fileName);
} catch (InterruptedException e) {
LOGGER.error("waitForFileToBeReady interrupted", e);
Thread.currentThread().interrupt();
}
});
}
}
/**
* Method to create policy input & call policy handlers.
*
* @param fileName the filename
*/
protected void createPolicyInputAndCallHandler(final String fileName) {
try {
final Csar csarObject = new Csar(fileName);
DistributionStatisticsManager.updateTotalDownloadCount();
inputReceived(csarObject);
DistributionStatisticsManager.updateDownloadSuccessCount();
DistributionStatisticsManager.updateDistributionSuccessCount();
} catch (final PolicyDecodingException ex) {
DistributionStatisticsManager.updateDownloadFailureCount();
DistributionStatisticsManager.updateDistributionFailureCount();
LOGGER.error("Policy creation failed", ex);
}
}
private void waitForFileToBeReady(final String fullFilePath) throws InterruptedException {
boolean flag = true;
while (flag) {
TimeUnit.MILLISECONDS.sleep(100);
try (ZipFile zipFile = new ZipFile(fullFilePath)) {
flag = false;
} catch (final IOException exp) {
LOGGER.error("file is not ready for reading, wait for sometime and try again", exp);
}
}
}
}
|
