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datarouter-metric

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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.metric.template;

import java.time.Duration;
import java.util.HashSet;
import java.util.Set;
import java.util.function.Function;
import java.util.function.Supplier;

import io.datarouter.instrumentation.metric.collector.MetricTemplateCollector;
import io.datarouter.instrumentation.metric.collector.MetricTemplateDto;
import io.datarouter.util.cache.LoadingCache;
import io.datarouter.util.cache.LoadingCache.LoadingCacheBuilder;

public class DatarouterMetricTemplateCollector implements MetricTemplateCollector{

	private static final long FLUSH_MS = Duration.ofSeconds(5).toMillis();

	private final MetricTemplateBuffer metricTemplateBuffer;
	private final LoadingCache loadingCache;
	private final Supplier saveToBuffer;

	private Set batch;
	private long lastFlushMs;
	private long nextFlushMs;

	public DatarouterMetricTemplateCollector(
			MetricTemplateBuffer metricTemplateBuffer,
			Supplier saveToBuffer){
		this.metricTemplateBuffer = metricTemplateBuffer;
		this.saveToBuffer = saveToBuffer;

		this.loadingCache = new LoadingCacheBuilder()
				.withExpireTtl(Duration.ofHours(1))
				.withLoadingFunction(Function.identity())
				.build();

		this.batch = new HashSet<>();
		this.lastFlushMs = 0;
		this.nextFlushMs = System.currentTimeMillis() + FLUSH_MS;
	}

	public synchronized void flush(long flushingMs){
		if(flushingMs <= lastFlushMs || batch.isEmpty()){
			return;
		}

		lastFlushMs = flushingMs;
		nextFlushMs = flushingMs + FLUSH_MS;

		Set snapshot = batch;
		batch = new HashSet<>();

		if(saveToBuffer.get()){
			metricTemplateBuffer.offerMulti(snapshot);
		}
	}

	@Override
	public void stopAndFlushAll(){
		flush(nextFlushMs);
	}

	@Override
	public void add(MetricTemplateDto pattern){
		if(System.currentTimeMillis() >= nextFlushMs){
			flush(nextFlushMs);
		}

		if(!loadingCache.load(pattern)){
			batch.add(pattern);
		}
	}

}