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Aiven's GCS Sink Connector for Apache Kafka

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/*
 * Copyright 2020 Aiven Oy
 *
 * Licensed 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.aiven.kafka.connect.gcs;

import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import org.apache.kafka.common.config.ConfigDef;
import org.apache.kafka.connect.connector.Task;
import org.apache.kafka.connect.sink.SinkConnector;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public final class GcsSinkConnector extends SinkConnector {
    private static final Logger LOG = LoggerFactory.getLogger(GcsSinkConnector.class);

    private Map configProps;
    private GcsSinkConfig config; // NOPMD field name same as in a method

    // required by Connect
    public GcsSinkConnector() { // NOPMD
        super();
    }

    @Override
    public String version() {
        return Version.VERSION;
    }

    @Override
    public void start(final Map props) {
        Objects.requireNonNull(props, "props cannot be null");

        this.configProps = Collections.unmodifiableMap(props);
        this.config = new GcsSinkConfig(props);
        LOG.info("Starting connector {}", config.getConnectorName());
    }

    @Override
    public Class taskClass() {
        return GcsSinkTask.class;
    }

    @Override
    public List> taskConfigs(final int maxTasks) {
        final List> configs = new ArrayList<>(maxTasks);
        for (int i = 0; i < maxTasks; i++) {
            final Map config = new HashMap<>(configProps); // NOPMD instantiation in a loop
            configs.add(config);
        }
        return configs;
    }

    @Override
    public void stop() {
        // Nothing to do.
        LOG.info("Stopping connector {}", config.getConnectorName());
    }

    @Override
    public ConfigDef config() {
        return GcsSinkConfig.configDef();
    }
}