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/*
 * Copyright (C) 2013, 2014 Brett Wooldridge
 *
 * 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 com.zaxxer.hikari.metrics.prometheus;

import com.zaxxer.hikari.metrics.MetricsTracker;
import io.prometheus.client.Counter;
import io.prometheus.client.Summary;

class PrometheusMetricsTracker extends MetricsTracker {
   private final Counter.Child connectionTimeoutCounter;
   private final Summary.Child elapsedAcquiredSummary;
   private final Summary.Child elapsedBorrowedSummary;

   PrometheusMetricsTracker(String poolName) {
      super();

      Counter counter = Counter.build()
         .name("hikaricp_connection_timeout_count")
         .labelNames("pool")
         .help("Connection timeout count")
         .register();

      this.connectionTimeoutCounter = counter.labels(poolName);

      Summary elapsedAcquiredSummary = Summary.build()
         .name("hikaricp_connection_acquired_nanos")
         .labelNames("pool")
         .help("Connection acquired time")
         .register();
      this.elapsedAcquiredSummary = elapsedAcquiredSummary.labels(poolName);

      Summary elapsedBorrowedSummary = Summary.build()
         .name("hikaricp_connection_usage_millis")
         .labelNames("pool")
         .help("Connection usage")
         .register();
      this.elapsedBorrowedSummary = elapsedBorrowedSummary.labels(poolName);
   }

   @Override
   public void recordConnectionAcquiredNanos(long elapsedAcquiredNanos) {
      elapsedAcquiredSummary.observe(elapsedAcquiredNanos);
   }

   @Override
   public void recordConnectionUsageMillis(long elapsedBorrowedMillis) {
      elapsedBorrowedSummary.observe(elapsedBorrowedMillis);
   }

   @Override
   public void recordConnectionTimeout() {
      connectionTimeoutCounter.inc();
   }
}