com.spotify.helios.agent.KafkaClientProvider Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of helios-services Show documentation
The newest version!
/*
 * Copyright (c) 2014 Spotify AB.
 *
 * 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 com.spotify.helios.agent;

import com.google.common.base.Function;
import com.google.common.base.Joiner;
import com.google.common.base.Optional;
import com.google.common.collect.ImmutableMap;

import org.apache.kafka.clients.producer.KafkaProducer;
import org.apache.kafka.common.serialization.Serializer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nullable;
import javax.validation.constraints.NotNull;

import java.util.List;

public class KafkaClientProvider {

  private static final Logger log = LoggerFactory.getLogger(KafkaClientProvider.class);

  private static final String KAFKA_HELIOS_CLIENT_ID = "Helios";
  private static final String KAFKA_QUORUM_PARAMETER = "1";

  private final Optional> partialConfigs;

  public KafkaClientProvider(@Nullable final List brokerList) {
    partialConfigs = Optional.fromNullable(brokerList).transform(
        new Function, ImmutableMap>() {
      @Nullable
      @Override
      public ImmutableMap apply(List input) {
        return ImmutableMap.of(
            "bootstrap.servers", Joiner.on(',').join(input),
            "acks", KAFKA_QUORUM_PARAMETER,
            "client.id", KAFKA_HELIOS_CLIENT_ID);
      }
    });
  }

  static KafkaClientProvider getTestingProvider() {
    return new KafkaClientProvider(null);
  }

  public  Optional> getProducer(@NotNull final Serializer ks,
                                                          @NotNull final Serializer vs) {
    try {
      return partialConfigs.transform(
          new Function, KafkaProducer>() {
            @Nullable
            @Override
            public KafkaProducer apply(ImmutableMap input) {
              return new KafkaProducer<>(input, ks, vs);
            }
          });
    } catch (final Exception e) {
      log.warn("error while generating KafkaProducer - {}", e);
      return Optional.absent();
    }
  }
}