| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| package org.apache.nifi.properties.configuration; |
| |
| import org.apache.commons.lang3.StringUtils; |
| import org.apache.nifi.properties.BootstrapProperties; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.UncheckedIOException; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.nio.file.Paths; |
| import java.util.Objects; |
| import java.util.Optional; |
| import java.util.Properties; |
| import java.util.Set; |
| |
| /** |
| * Shared Client Provider for reading Client Properties from file referenced in configured Bootstrap Property Key |
| * |
| * @param <T> Client Type |
| */ |
| public abstract class BootstrapPropertiesClientProvider<T> implements ClientProvider<T> { |
| protected final Logger logger = LoggerFactory.getLogger(getClass()); |
| |
| private final BootstrapProperties.BootstrapPropertyKey bootstrapPropertyKey; |
| |
| public BootstrapPropertiesClientProvider(final BootstrapProperties.BootstrapPropertyKey bootstrapPropertyKey) { |
| this.bootstrapPropertyKey = Objects.requireNonNull(bootstrapPropertyKey, "Bootstrap Property Key required"); |
| } |
| |
| /** |
| * Get Client using Client Properties |
| * |
| * @param clientProperties Client Properties can be null |
| * @return Configured Client or empty when Client Properties object is null |
| */ |
| @Override |
| public Optional<T> getClient(final Properties clientProperties) { |
| return isMissingProperties(clientProperties) ? Optional.empty() : Optional.of(getConfiguredClient(clientProperties)); |
| } |
| |
| /** |
| * Get Client Properties from file referenced in Bootstrap Properties |
| * |
| * @param bootstrapProperties Bootstrap Properties |
| * @return Client Properties or empty when not configured |
| */ |
| @Override |
| public Optional<Properties> getClientProperties(final BootstrapProperties bootstrapProperties) { |
| Objects.requireNonNull(bootstrapProperties, "Bootstrap Properties required"); |
| final String clientBootstrapPropertiesPath = bootstrapProperties.getProperty(bootstrapPropertyKey).orElse(null); |
| if (StringUtils.isBlank(clientBootstrapPropertiesPath)) { |
| logger.debug("Client Properties [{}] not configured", bootstrapPropertyKey); |
| return Optional.empty(); |
| } else { |
| final Path propertiesPath = Paths.get(clientBootstrapPropertiesPath); |
| if (Files.exists(propertiesPath)) { |
| try { |
| final Properties clientProperties = new Properties(); |
| try (final InputStream inputStream = Files.newInputStream(propertiesPath)) { |
| clientProperties.load(inputStream); |
| } |
| return Optional.of(clientProperties); |
| } catch (final IOException e) { |
| final String message = String.format("Loading Client Properties Failed [%s]", propertiesPath); |
| throw new UncheckedIOException(message, e); |
| } |
| } else { |
| logger.debug("Client Properties [{}] Path [{}] not found", bootstrapPropertyKey, propertiesPath); |
| return Optional.empty(); |
| } |
| } |
| } |
| |
| /** |
| * Get Configured Client using Client Properties |
| * |
| * @param clientProperties Client Properties |
| * @return Configured Client |
| */ |
| protected abstract T getConfiguredClient(final Properties clientProperties); |
| |
| /** |
| * Get Property Names required for initializing client in order to perform initial validation |
| * |
| * @return Set of required client property names |
| */ |
| protected abstract Set<String> getRequiredPropertyNames(); |
| |
| private boolean isMissingProperties(final Properties clientProperties) { |
| return clientProperties == null || getRequiredPropertyNames().stream().anyMatch(propertyName -> |
| StringUtils.isBlank(clientProperties.getProperty(propertyName)) |
| ); |
| } |
| } |