com.spotify.helios.agent.KafkaClientProvider.java Source code

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Here is the source code for com.spotify.helios.agent.KafkaClientProvider.java

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/*
 * 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<ImmutableMap<String, Object>> partialConfigs;

    public KafkaClientProvider(@Nullable final List<String> brokerList) {
        partialConfigs = Optional.fromNullable(brokerList)
                .transform(new Function<List<String>, ImmutableMap<String, Object>>() {
                    @Nullable
                    @Override
                    public ImmutableMap<String, Object> apply(List<String> input) {
                        return ImmutableMap.<String, Object>of("bootstrap.servers", Joiner.on(',').join(input),
                                "acks", KAFKA_QUORUM_PARAMETER, "client.id", KAFKA_HELIOS_CLIENT_ID,
                                "metadata.fetch.timeout.ms", 5000);
                    }
                });
    }

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

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