| /* |
| * 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.processors.kafka.pubsub; |
| |
| import org.apache.kafka.clients.producer.KafkaProducer; |
| import org.apache.kafka.clients.producer.Producer; |
| import org.apache.nifi.logging.ComponentLog; |
| import org.apache.nifi.components.ConfigVerificationResult; |
| |
| import java.io.Closeable; |
| import java.nio.charset.Charset; |
| import java.util.HashMap; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.BlockingQueue; |
| import java.util.concurrent.LinkedBlockingQueue; |
| import java.util.function.Supplier; |
| import java.util.regex.Pattern; |
| |
| public class PublisherPool implements Closeable { |
| private final ComponentLog logger; |
| private final BlockingQueue<PublisherLease> publisherQueue; |
| private final Map<String, Object> kafkaProperties; |
| private final int maxMessageSize; |
| private final long maxAckWaitMillis; |
| private final boolean useTransactions; |
| private final Pattern attributeNameRegex; |
| private final Charset headerCharacterSet; |
| private Supplier<String> transactionalIdSupplier; |
| |
| private volatile boolean closed = false; |
| |
| PublisherPool(final Map<String, Object> kafkaProperties, final ComponentLog logger, final int maxMessageSize, final long maxAckWaitMillis, |
| final boolean useTransactions, final Supplier<String> transactionalIdSupplier, final Pattern attributeNameRegex, final Charset headerCharacterSet) { |
| this.logger = logger; |
| this.publisherQueue = new LinkedBlockingQueue<>(); |
| this.kafkaProperties = kafkaProperties; |
| this.maxMessageSize = maxMessageSize; |
| this.maxAckWaitMillis = maxAckWaitMillis; |
| this.useTransactions = useTransactions; |
| this.attributeNameRegex = attributeNameRegex; |
| this.headerCharacterSet = headerCharacterSet; |
| this.transactionalIdSupplier = transactionalIdSupplier; |
| } |
| |
| public PublisherLease obtainPublisher() { |
| if (isClosed()) { |
| throw new IllegalStateException("Connection Pool is closed"); |
| } |
| |
| PublisherLease lease = publisherQueue.poll(); |
| if (lease != null) { |
| return lease; |
| } |
| |
| lease = createLease(); |
| return lease; |
| } |
| |
| private PublisherLease createLease() { |
| final Map<String, Object> properties = new HashMap<>(kafkaProperties); |
| if (useTransactions) { |
| properties.put("transactional.id", transactionalIdSupplier.get()); |
| } |
| |
| final Producer<byte[], byte[]> producer = new KafkaProducer<>(properties); |
| final PublisherLease lease = new PublisherLease(producer, maxMessageSize, maxAckWaitMillis, logger, useTransactions, attributeNameRegex, headerCharacterSet) { |
| private volatile boolean closed = false; |
| |
| @Override |
| public void close() { |
| if (isPoisoned() && useTransactions && !closed) { |
| try { |
| producer.abortTransaction(); |
| } catch (final Exception e) { |
| logger.error("Failed to abort producer transaction", e); |
| } |
| } |
| |
| if (isPoisoned() || isClosed()) { |
| if (closed) { |
| return; |
| } |
| |
| closed = true; |
| super.close(); |
| } else { |
| publisherQueue.offer(this); |
| } |
| } |
| }; |
| |
| return lease; |
| } |
| |
| public synchronized boolean isClosed() { |
| return closed; |
| } |
| |
| @Override |
| public synchronized void close() { |
| closed = true; |
| |
| PublisherLease lease; |
| while ((lease = publisherQueue.poll()) != null) { |
| lease.close(); |
| } |
| } |
| |
| /** |
| * Returns the number of leases that are currently available |
| * |
| * @return the number of leases currently available |
| */ |
| protected int available() { |
| return publisherQueue.size(); |
| } |
| |
| public List<ConfigVerificationResult> verifyConfiguration(final String topic) { |
| try (final PublisherLease lease = obtainPublisher()) { |
| return lease.verifyConfiguration(topic); |
| } |
| } |
| } |