io.svectors.hbase.cdc.config.KafkaConfiguration.java Source code

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Here is the source code for io.svectors.hbase.cdc.config.KafkaConfiguration.java

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/**
 * 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 io.svectors.hbase.cdc.config;

import io.svectors.hbase.cdc.ReplicationException;
import org.apache.hadoop.conf.Configuration;
import org.apache.kafka.clients.producer.Callback;
import java.util.Map;
import java.util.Optional;

import static io.svectors.hbase.cdc.KafkaProps.*;
import static java.util.stream.Collectors.toMap;

/**
 * @author ravi.magham
 */
public class KafkaConfiguration {

    public static final String KAFKA_PREFIX_KEY = "kafka.";
    private final Configuration configuration;
    private final Map<String, Object> kafkaProperties;

    /**
     *
     * @param configuration
     */
    public KafkaConfiguration(final Configuration configuration) {
        this.configuration = configuration;
        this.kafkaProperties = filter(configuration);
    }

    /**
     * Filters the configuration for
     * @param configuration
     * @return
     */
    private Map<String, Object> filter(final Configuration configuration) {
        final Map<String, Object> kafkaProperties = configuration.getValByRegex(KAFKA_PREFIX_KEY).entrySet()
                .stream().collect(toMap(e -> e.getKey().substring(KAFKA_PREFIX_KEY.length()), e -> e.getValue()));
        return kafkaProperties;
    }

    /**
     * Returns the properties for kafka.
     * @return
     */
    public Map<String, Object> getAsMap() {
        return kafkaProperties;
    }

    /**
     * Returns the default callback handler when running in async mode.
     * @return
     */
    public Callback getCallbackHandler() {
        try {
            final String handlerClassName = this.configuration.get(KAFKA_PRODUCER_CALLBACK_HANDLER_PARAM,
                    KAFKA_DEFAULT_CALLBACK_HANDLER);
            final Class<? extends Callback> handlerClass = (Class<? extends Callback>) Class
                    .forName(handlerClassName);
            return handlerClass.newInstance();
        } catch (ClassNotFoundException | InstantiationException | IllegalAccessException e) {
            throw new ReplicationException(e);
        }
    }

    /**
     * returns if we are using the sync or async producer types.
     * @return
     */
    public boolean isAsyncProducer() {
        return KAFKA_ASYNC_PRODUCER_TYPE.equalsIgnoreCase(this.configuration.get(KAFKA_PRODUCER_TYPE_PARAM));
    }

    /**
     * returns the whitelist topics if any mentioned in configuration.
     * @return
     */
    public Optional<String> getWhitelistTopics() {
        Object topicNames = this.configuration.get(KAFKA_WHITE_LIST_TABLES_PARAM);
        if (topicNames == null) {
            return Optional.empty();
        } else {
            return Optional.of(topicNames.toString());
        }
    }
}