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/**
 * Copyright © 2009 HotPads ([email protected])
 *
 * 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.datarouter.conveyor.queue;

import java.time.Duration;
import java.util.List;
import java.util.function.Supplier;

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

import io.datarouter.conveyor.BaseConveyor;
import io.datarouter.conveyor.ConveyorCounters;
import io.datarouter.model.databean.Databean;
import io.datarouter.model.key.primary.PrimaryKey;
import io.datarouter.storage.queue.GroupQueueMessage;
import io.datarouter.storage.setting.Setting;

public abstract class BaseGroupQueueConsumerConveyor<
		PK extends PrimaryKey,
		D extends Databean>
extends BaseConveyor{
	private static final Logger logger = LoggerFactory.getLogger(BaseGroupQueueConsumerConveyor.class);

	private static final Duration PEEK_TIMEOUT = Duration.ofSeconds(5);

	private final GroupQueueConsumer consumer;

	public BaseGroupQueueConsumerConveyor(String name, Setting shouldRunSetting,
			GroupQueueConsumer consumer, Supplier compactExceptionLogging){
		super(name, shouldRunSetting, compactExceptionLogging);
		this.consumer = consumer;
	}

	@Override
	public ProcessBatchResult processBatch(){
		GroupQueueMessage message = consumer.peek(PEEK_TIMEOUT);
		if(message == null){
			logger.info("peeked conveyor={} nullMessage", name);
			return new ProcessBatchResult(false);
		}
		List databeans = message.getDatabeans();
		logger.info("peeked conveyor={} messageCount={}", name, databeans.size());
		processDatabeans(databeans);
		logger.info("wrote conveyor={} messageCount={}", name, databeans.size());
		ConveyorCounters.incPutMultiOpAndDatabeans(this, databeans.size());
		consumer.ack(message.getKey());
		logger.info("acked conveyor={} messageCount={}", name, databeans.size());
		ConveyorCounters.incAck(this);
		return new ProcessBatchResult(true);
	}

	protected abstract void processDatabeans(List databeans);

}