/*
 * Copyright (c) 2020 Oracle and/or its affiliates.
 *
 * 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.helidon.messaging.connectors.kafka;

import java.util.Collection;
import java.util.concurrent.CountDownLatch;
import java.util.logging.Logger;

import org.apache.kafka.clients.consumer.ConsumerRebalanceListener;
import org.apache.kafka.common.TopicPartition;

/**
 * Waiting latch for partition assigment, after that is consumer ready to receive.
 */
class PartitionsAssignedLatch extends CountDownLatch implements ConsumerRebalanceListener {

    private static final Logger LOGGER = Logger.getLogger(PartitionsAssignedLatch.class.getName());

    PartitionsAssignedLatch() {
        super(1);
    }

    @Override
    public void onPartitionsRevoked(Collection<TopicPartition> partitions) {
        LOGGER.fine(() -> "Partitions revoked: " + partitions);
        // Do nothing
    }

    @Override
    public void onPartitionsAssigned(Collection<TopicPartition> partitions) {
        LOGGER.fine(() -> "Partitions assigned: " + partitions);
        this.countDown();
    }
}
