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/*-
* ============LICENSE_START======================================================================
* Copyright (C) 2018 NOKIA Intellectual Property, 2018-2019 Nordix Foundation. 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.
* ============LICENSE_END========================================================================
*/
package org.onap.dcaegen2.collectors.datafile.tasks;
import java.nio.file.Files;
import java.nio.file.Path;
import java.time.Duration;
import java.time.Instant;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
import org.onap.dcaegen2.collectors.datafile.configuration.AppConfig;
import org.onap.dcaegen2.collectors.datafile.model.ConsumerDmaapModel;
import org.onap.dcaegen2.collectors.datafile.model.FileData;
import org.onap.dcaegen2.collectors.datafile.model.FileReadyMessage;
import org.onap.dcaegen2.collectors.datafile.model.logging.MdcVariables;
import org.onap.dcaegen2.collectors.datafile.service.PublishedFileCache;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;
import reactor.core.scheduler.Scheduler;
import reactor.core.scheduler.Schedulers;
/**
* This implements the main flow of the data file collector. Fetch file ready events from the
* message router, fetch new files from the PNF publish these in the data router.
*/
@Component
public class ScheduledTasks {
private static final int NUMBER_OF_WORKER_THREADS = 100;
private static final int MAX_TASKS_FOR_POLLING = 50;
private static final long DATA_ROUTER_MAX_RETRIES = 5;
private static final Duration DATA_ROUTER_INITIAL_RETRY_TIMEOUT = Duration.ofSeconds(2);
private static final long FILE_TRANSFER_MAX_RETRIES = 3;
private static final Duration FILE_TRANSFER_INITIAL_RETRY_TIMEOUT = Duration.ofSeconds(5);
private static final Logger logger = LoggerFactory.getLogger(ScheduledTasks.class);
private final AppConfig applicationConfiguration;
private final AtomicInteger currentNumberOfTasks = new AtomicInteger();
private final Scheduler scheduler = Schedulers.newParallel("FileCollectorWorker", NUMBER_OF_WORKER_THREADS);
PublishedFileCache alreadyPublishedFiles = new PublishedFileCache();
/**
* Constructor for task registration in Datafile Workflow.
*
* @param applicationConfiguration - application configuration
*/
@Autowired
public ScheduledTasks(AppConfig applicationConfiguration) {
this.applicationConfiguration = applicationConfiguration;
}
/**
* Main function for scheduling for the file collection Workflow.
*/
public void scheduleMainDatafileEventTask(Map<String, String> contextMap) {
try {
MdcVariables.setMdcContextMap(contextMap);
logger.trace("Execution of tasks was registered");
applicationConfiguration.loadConfigurationFromFile();
createMainTask(contextMap).subscribe(model -> onSuccess(model, contextMap), thr -> onError(thr, contextMap),
() -> onComplete(contextMap));
} catch (Exception e) {
logger.error("Unexpected exception: ", e);
}
}
Flux<ConsumerDmaapModel> createMainTask(Map<String, String> contextMap) {
return fetchMoreFileReadyMessages() //
.parallel(NUMBER_OF_WORKER_THREADS) // Each FileReadyMessage in a separate thread
.runOn(scheduler) //
.flatMap(fileReadyMessage -> Flux.fromIterable(fileReadyMessage.files())) //
.filter(fileData -> shouldBePublished(fileData, contextMap)) //
.doOnNext(fileData -> currentNumberOfTasks.incrementAndGet()) //
.flatMap(fileData -> fetchFile(fileData, contextMap)) //
.flatMap(model -> publishToDataRouter(model, contextMap)) //
.doOnNext(model -> deleteFile(model.getInternalLocation(), contextMap)) //
.doOnNext(model -> currentNumberOfTasks.decrementAndGet()) //
.sequential();
}
/**
* called in regular intervals to remove out-dated cached information.
*/
public void purgeCachedInformation(Instant now) {
alreadyPublishedFiles.purge(now);
}
protected PublishedChecker createPublishedChecker() {
return new PublishedChecker(applicationConfiguration);
}
protected int getCurrentNumberOfTasks() {
return currentNumberOfTasks.get();
}
protected DMaaPMessageConsumerTask createConsumerTask() {
return new DMaaPMessageConsumerTask(this.applicationConfiguration);
}
protected FileCollector createFileCollector() {
return new FileCollector(applicationConfiguration);
}
protected DataRouterPublisher createDataRouterPublisher() {
return new DataRouterPublisher(applicationConfiguration);
}
private void onComplete(Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
logger.trace("Datafile tasks have been completed");
}
private synchronized void onSuccess(ConsumerDmaapModel model, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
logger.info("Datafile file published {}", model.getInternalLocation());
}
private void onError(Throwable throwable, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
logger.error("Chain of tasks have been aborted due to errors in Datafile workflow {}", throwable.toString());
}
private boolean shouldBePublished(FileData fileData, Map<String, String> contextMap) {
boolean result = false;
Path localFilePath = fileData.getLocalFilePath();
if (alreadyPublishedFiles.put(localFilePath) == null) {
result = !createPublishedChecker().execute(fileData.name(), contextMap);
}
return result;
}
private Mono<ConsumerDmaapModel> fetchFile(FileData fileData, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
return createFileCollector()
.execute(fileData, FILE_TRANSFER_MAX_RETRIES, FILE_TRANSFER_INITIAL_RETRY_TIMEOUT, contextMap)
.onErrorResume(exception -> handleFetchFileFailure(fileData, contextMap));
}
private Mono<ConsumerDmaapModel> handleFetchFileFailure(FileData fileData, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
Path localFilePath = fileData.getLocalFilePath();
logger.error("File fetching failed, fileData {}", fileData);
deleteFile(localFilePath, contextMap);
alreadyPublishedFiles.remove(localFilePath);
currentNumberOfTasks.decrementAndGet();
return Mono.empty();
}
private Mono<ConsumerDmaapModel> publishToDataRouter(ConsumerDmaapModel model, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
return createDataRouterPublisher()
.execute(model, DATA_ROUTER_MAX_RETRIES, DATA_ROUTER_INITIAL_RETRY_TIMEOUT, contextMap)
.onErrorResume(exception -> handlePublishFailure(model, contextMap));
}
private Mono<ConsumerDmaapModel> handlePublishFailure(ConsumerDmaapModel model, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
logger.error("File publishing failed: {}", model);
Path internalFileName = model.getInternalLocation();
deleteFile(internalFileName, contextMap);
alreadyPublishedFiles.remove(internalFileName);
currentNumberOfTasks.decrementAndGet();
return Mono.empty();
}
/**
* Fetch more messages from the message router. This is done in a polling/blocking fashion.
*/
private Flux<FileReadyMessage> fetchMoreFileReadyMessages() {
logger.info("Consuming new file ready messages, current number of tasks: {}", getCurrentNumberOfTasks());
if (getCurrentNumberOfTasks() > MAX_TASKS_FOR_POLLING) {
logger.info("Skipping, current number of tasks: {}", getCurrentNumberOfTasks());
return Flux.empty();
}
Map<String, String> contextMap = MDC.getCopyOfContextMap();
return createConsumerTask() //
.execute() //
.onErrorResume(exception -> handleConsumeMessageFailure(exception, contextMap));
}
private Flux<FileReadyMessage> handleConsumeMessageFailure(Throwable exception, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
logger.error("Polling for file ready message failed, exception: {}, config: {}", exception.toString(),
this.applicationConfiguration.getDmaapConsumerConfiguration());
return Flux.empty();
}
private void deleteFile(Path localFile, Map<String, String> contextMap) {
MdcVariables.setMdcContextMap(contextMap);
logger.trace("Deleting file: {}", localFile);
try {
Files.delete(localFile);
} catch (Exception e) {
logger.trace("Could not delete file: {}", localFile);
}
}
}
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