| /* |
| * 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.samza.coordinator.stream; |
| |
| import java.util.Set; |
| import org.apache.samza.config.Config; |
| import org.apache.samza.coordinator.stream.messages.CoordinatorStreamMessage; |
| import org.apache.samza.metrics.MetricsRegistry; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Class which handles the common functionality for coordinator stream consumer and producer |
| */ |
| public class CoordinatorStreamManager { |
| private static final Logger LOG = LoggerFactory.getLogger(CoordinatorStreamManager.class); |
| |
| private final CoordinatorStreamSystemProducer coordinatorStreamProducer; |
| private final CoordinatorStreamSystemConsumer coordinatorStreamConsumer; |
| |
| /** |
| * Creates a new read-only {@link CoordinatorStreamManager} with a given coordinator stream consumer. |
| * |
| * @param coordinatorStreamConsumer The {@link CoordinatorStreamSystemConsumer} which should be used with the {@link CoordinatorStreamManager} |
| */ |
| public CoordinatorStreamManager(CoordinatorStreamSystemConsumer coordinatorStreamConsumer) { |
| this(null, coordinatorStreamConsumer); |
| } |
| |
| /** |
| * Creates a new write-only {@link CoordinatorStreamManager} with a given coordinator stream producer. |
| * |
| * @param coordinatorStreamProducer The {@link CoordinatorStreamSystemProducer} which should be used with the {@link CoordinatorStreamManager} |
| */ |
| public CoordinatorStreamManager(CoordinatorStreamSystemProducer coordinatorStreamProducer) { |
| this(coordinatorStreamProducer, null); |
| } |
| |
| /** |
| * Creates a new {@link CoordinatorStreamManager} with a given coordinator stream producer and consumer. |
| * |
| * @param coordinatorStreamProducer The {@link CoordinatorStreamSystemProducer} which should be used with the {@link CoordinatorStreamManager} |
| * @param coordinatorStreamConsumer The {@link CoordinatorStreamSystemConsumer} which should be used with the {@link CoordinatorStreamManager} |
| */ |
| public CoordinatorStreamManager(CoordinatorStreamSystemProducer coordinatorStreamProducer, |
| CoordinatorStreamSystemConsumer coordinatorStreamConsumer) { |
| this.coordinatorStreamProducer = coordinatorStreamProducer; |
| this.coordinatorStreamConsumer = coordinatorStreamConsumer; |
| } |
| |
| /** |
| * Creates a new {@link CoordinatorStreamManager} and instantiates the underlying coordinator stream producer and consumer. |
| * |
| * @param coordinatorSystemConfig Configuration used to instantiate the coordinator stream producer and consumer. |
| * @param metricsRegistry Metrics registry |
| */ |
| public CoordinatorStreamManager(Config coordinatorSystemConfig, MetricsRegistry metricsRegistry) { |
| coordinatorStreamConsumer = new CoordinatorStreamSystemConsumer(coordinatorSystemConfig, metricsRegistry); |
| coordinatorStreamProducer = new CoordinatorStreamSystemProducer(coordinatorSystemConfig, metricsRegistry); |
| } |
| |
| /** |
| * Register source with the coordinator stream. |
| * |
| * @param source source to register with the coordinator stream |
| */ |
| public void register(String source) { |
| if (coordinatorStreamConsumer != null) { |
| LOG.info("Registering coordinator system stream consumer from {}.", source); |
| coordinatorStreamConsumer.register(); |
| } |
| if (coordinatorStreamProducer != null) { |
| LOG.info("Registering coordinator system stream producer from {}.", source); |
| coordinatorStreamProducer.register(source); |
| } |
| } |
| |
| /** |
| * Starts the underlying coordinator stream producer and consumer. |
| */ |
| public void start() { |
| if (coordinatorStreamConsumer != null) { |
| LOG.debug("Starting coordinator system stream consumer."); |
| coordinatorStreamConsumer.start(); |
| } |
| if (coordinatorStreamProducer != null) { |
| LOG.debug("Starting coordinator system stream producer."); |
| coordinatorStreamProducer.start(); |
| } |
| } |
| |
| /** |
| * Stops the underlying coordinator stream producer and consumer. |
| */ |
| public void stop() { |
| if (coordinatorStreamConsumer != null) { |
| coordinatorStreamConsumer.stop(); |
| } |
| if (coordinatorStreamProducer != null) { |
| coordinatorStreamProducer.stop(); |
| } |
| } |
| |
| /** |
| * Sends a {@link CoordinatorStreamMessage} using the underlying system producer. |
| * |
| * @param message message which should be sent to producer |
| */ |
| public void send(CoordinatorStreamMessage message) { |
| if (coordinatorStreamProducer == null) { |
| throw new UnsupportedOperationException( |
| String.format("CoordinatorStreamProducer is not initialized in the CoordinatorStreamManager. ")); |
| } |
| coordinatorStreamProducer.send(message); |
| } |
| |
| /** |
| * Bootstrap the coordinator stream consumer. |
| */ |
| public void bootstrap() { |
| if (coordinatorStreamConsumer != null) { |
| LOG.debug("Bootstrapping coordinator system stream consumer."); |
| coordinatorStreamConsumer.bootstrap(); |
| } |
| } |
| |
| /** |
| * Returns a set of messages from the bootstrapped stream for a given source. |
| * |
| * @param source the source of the given messages |
| * @return a set of {@link CoordinatorStreamMessage} if messages exists for the given source, else an empty set |
| */ |
| public Set<CoordinatorStreamMessage> getBootstrappedStream(String source) { |
| if (coordinatorStreamConsumer == null) { |
| throw new UnsupportedOperationException( |
| String.format("CoordinatorStreamConsumer is not initialized in the CoordinatorStreamManager. ")); |
| } |
| return coordinatorStreamConsumer.getBootstrappedStream(source); |
| } |
| |
| /** |
| * Returns the config from the coordinator stream consumer. |
| * |
| * @return Config of the coordinator stream consumer. |
| */ |
| public Config getConfig() { |
| if (coordinatorStreamConsumer == null) { |
| throw new IllegalStateException( |
| String.format("CoordinatorStreamConsumer is not initialized in the CoordinatorStreamManager. ")); |
| } |
| return coordinatorStreamConsumer.getConfig(); |
| } |
| } |