diff options
Diffstat (limited to 'src/main/java/org/onap/integration/simulators/nfsimulator/vesclient/filesystem/WatcherEventProcessor.java')
-rw-r--r-- | src/main/java/org/onap/integration/simulators/nfsimulator/vesclient/filesystem/WatcherEventProcessor.java | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/src/main/java/org/onap/integration/simulators/nfsimulator/vesclient/filesystem/WatcherEventProcessor.java b/src/main/java/org/onap/integration/simulators/nfsimulator/vesclient/filesystem/WatcherEventProcessor.java new file mode 100644 index 0000000..15c5d7b --- /dev/null +++ b/src/main/java/org/onap/integration/simulators/nfsimulator/vesclient/filesystem/WatcherEventProcessor.java @@ -0,0 +1,111 @@ +/*- + * ============LICENSE_START======================================================= + * Simulator + * ================================================================================ + * Copyright (C) 2019 Nokia. 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.integration.simulators.nfsimulator.vesclient.filesystem; + +import java.io.IOException; +import java.nio.charset.StandardCharsets; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.StandardWatchEventKinds; +import java.nio.file.WatchEvent; +import java.nio.file.WatchEvent.Kind; +import java.time.Instant; +import java.util.Arrays; +import java.util.Optional; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import lombok.extern.slf4j.Slf4j; +import org.bson.BSONException; +import org.bson.json.JsonParseException; +import org.onap.integration.simulators.nfsimulator.vesclient.db.Storage; +import org.onap.integration.simulators.nfsimulator.vesclient.template.Template; +import org.bson.Document; + +@Slf4j +public enum WatcherEventProcessor { + CREATED(StandardWatchEventKinds.ENTRY_CREATE) { + @Override + public void processEvent(Path path, Storage<Template> storage) throws IOException { + String content = getContent(path); + String fileName = path.getFileName().toString(); + Document documentsContent = Document.parse(content); + storage.persist(new Template(fileName, documentsContent, Instant.now().getNano())); + log.info("DB record created for template: " + fileName); + } + }, + MODIFIED(StandardWatchEventKinds.ENTRY_MODIFY) { + @Override + public void processEvent(Path path, Storage<Template> storage) throws IOException { + String fileName = path.getFileName().toString(); + String content = getContent(path); + Document documentsContent = Document.parse(content); + Template template = storage.get(fileName).orElse(new Template(fileName, documentsContent, Instant.now().getNano())); + template.setContent(documentsContent); + storage.persist(template); + log.info("DB record modified for template: " + fileName); + } + }, + DELETED(StandardWatchEventKinds.ENTRY_DELETE) { + @Override + public void processEvent(Path path, Storage<Template> storage) { + String fileName = path.getFileName().toString(); + storage.delete(fileName); + log.info("DB record deleted for template: " + fileName); + } + }; + + private final Kind<Path> pathKind; + + String getContent(Path path) throws IOException { + try (Stream<String> lines = Files.lines(path, StandardCharsets.UTF_8)) { + return lines.collect(Collectors.joining(System.lineSeparator())); + } catch (IOException e) { + log.error("Could not get content due to: " + e.getMessage() + " " + e.getCause(), e); + throw e; + } + } + + WatcherEventProcessor(Kind<Path> pathKind) { + this.pathKind = pathKind; + } + + public abstract void processEvent(Path templateName, Storage<Template> storage) throws IOException; + + static void process(WatchEvent<?> event, Storage<Template> storage, Path templatesDir) { + Optional<WatcherEventProcessor> watcherEventProcessor = getWatcherEventProcessor(event); + watcherEventProcessor.ifPresent(processor -> { + try { + final Path templatePath = templatesDir.resolve((Path) event.context()); + processor.processEvent(templatePath, storage); + } catch (IOException e) { + log.error("Error during processing DB record for template.", e); + } catch (BSONException | JsonParseException e) { + log.error("Invalid JSON format provided for template.", e); + } + }); + } + + private static Optional<WatcherEventProcessor> getWatcherEventProcessor(WatchEvent<?> event) { + return Arrays.stream(values()).filter(value -> value.pathKind.equals(event.kind())).findFirst(); + } + +} |