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/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2018 Intel Corp. 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.distribution.reception.handling.sdc;
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 org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
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;
/**
* Handles reception of inputs from File System which can be used to decode policies.
*/
public class FileSystemReceptionHandler extends AbstractReceptionHandler {
private boolean running = false;
private static final Logger LOGGER = FlexLogger.getLogger(FileSystemReceptionHandler.class);
@Override
protected void initializeReception(final String parameterGroupName) {
LOGGER.debug("FileSystemReceptionHandler init...");
try {
final FileSystemReceptionHandlerConfigurationParameterGroup handlerParameters =
ParameterService.get(parameterGroupName);
main(handlerParameters.getWatchPath());
} catch (final Exception ex) {
LOGGER.error(ex);
}
running = false;
LOGGER.debug("FileSystemReceptionHandler main loop exited...");
}
@Override
public void destroy() {
// Tear down subscription etc
running = false;
}
public boolean isRunning() {
return running;
}
/**
* Main entry point.
*
* @param watchPath Path to watch
*/
public void main(String watchPath) 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());
startMainLoop(watcher, dir);
} catch (final InterruptedException ex) {
LOGGER.debug(ex);
Thread.currentThread().interrupt();
}
}
@SuppressWarnings("unchecked")
protected void startMainLoop(WatchService watcher, Path dir) throws InterruptedException {
WatchKey key;
running = true;
while (running) {
key = watcher.take();
for (final WatchEvent<?> event : key.pollEvents()) {
final WatchEvent<Path> ev = (WatchEvent<Path>) event;
final Path fileName = ev.context();
LOGGER.debug("new CSAR found: " + fileName);
createPolicyInputAndCallHandler(dir.toString() + File.separator + fileName.toString());
LOGGER.debug("CSAR complete: " + fileName);
}
final boolean valid = key.reset();
if (!valid) {
LOGGER.error("Watch key no longer valid!");
break;
}
}
}
protected void createPolicyInputAndCallHandler(final String fileName) {
try {
final Csar csarObject = new Csar(fileName);
inputReceived(csarObject);
} catch (final PolicyDecodingException ex) {
LOGGER.error(ex);
}
}
}
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