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datarouter-conveyor
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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;

import java.util.function.Supplier;

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

import io.datarouter.storage.setting.Setting;

public abstract class BaseConveyor implements Conveyor{
	private static final Logger logger = LoggerFactory.getLogger(BaseConveyor.class);

	protected final String name;
	private final Setting shouldRunSetting;
	private final Supplier compactExceptionLogging;

	public BaseConveyor(String name, Setting shouldRunSetting, Supplier compactExceptionLogging){
		this.name = name;
		this.shouldRunSetting = shouldRunSetting;
		this.compactExceptionLogging = compactExceptionLogging;
	}

	public abstract ProcessBatchResult processBatch();

	@SuppressWarnings("unused")
	public void interrupted() throws Exception{
	}

	protected static class ProcessBatchResult{
		public final boolean shouldContinueImmediately;

		public ProcessBatchResult(boolean shouldContinueImmediately){
			this.shouldContinueImmediately = shouldContinueImmediately;
		}
	}

	@Override
	public void run(){
		try{
			int iteration = 0;
			long start = System.currentTimeMillis();
			while(shouldRun()){
				iteration++;
				ProcessBatchResult result = processBatch();
				if(!result.shouldContinueImmediately){
					break;
				}
			}
			long duration = System.currentTimeMillis() - start;
			ConveyorCounters.incFinishDrain(this);
			logger.info("drain finished for conveyor={} duration={} iterations={} ", name, duration, iteration);
		}catch(Throwable e){
			if(e instanceof InterruptedException){
				try{
					interrupted();
				}catch(Exception ex){
					logger.error(ex.getMessage(), ex);
				}
			}
			ConveyorCounters.incException(this);
			if(getCompactExceptionLogging()){
				logger.warn("logging exception so ScheduledExecutorService restarts this Runnable {}", e.toString());
			}else{
				logger.warn("swallowing exception so ScheduledExecutorService restarts this Runnable", e);
			}
		}
	}

	@Override
	public String getName(){
		return name;
	}

	@Override
	public boolean shouldRun(){
		return !Thread.currentThread().isInterrupted() && shouldRunSetting.get();
	}

	private boolean getCompactExceptionLogging(){
		try{
			return compactExceptionLogging.get();
		}catch(Exception e){
			logger.warn("invalid value for compactExceptionLogging", e);
			return false;
		}
	}

}