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/*
 * Copyright 2019, OpenTelemetry Authors
 *
 * 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.opentelemetry.metrics;

import javax.annotation.concurrent.ThreadSafe;

/**
 * A registry for creating named {@link Meter}s. The name Provider is for consistency with
 * other languages and it is NOT loaded using reflection.
 *
 * @see io.opentelemetry.OpenTelemetry
 * @see io.opentelemetry.metrics.Meter
 * @since 0.1.0
 */
@ThreadSafe
public interface MeterProvider {

  /**
   * Gets or creates a named meter instance.
   *
   * @param instrumentationName The name of the instrumentation library, not the name of the
   *     instrument*ed* library.
   * @return a tracer instance.
   * @since 0.1.0
   */
  Meter get(String instrumentationName);

  /**
   * Gets or creates a named and versioned meter instance.
   *
   * @param instrumentationName The name of the instrumentation library, not the name of the
   *     instrument*ed* library.
   * @param instrumentationVersion The version of the instrumentation library.
   * @return a tracer instance.
   * @since 0.1.0
   */
  Meter get(String instrumentationName, String instrumentationVersion);
}