/*
 * Copyright 2018-2019 the original author or 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
 *
 *      https://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 org.springframework.cloud.gateway.rsocket.metrics;

import java.util.Objects;

import io.micrometer.core.instrument.Meter;
import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Tag;
import io.rsocket.RSocket;
import io.rsocket.plugins.RSocketInterceptor;

public class MicrometerResponderRSocketInterceptor implements RSocketInterceptor {

	private final MeterRegistry meterRegistry;

	private final Tag[] tags;

	/**
	 * Creates a new {@link RSocketInterceptor}.
	 * @param meterRegistry the {@link MeterRegistry} to use to create {@link Meter}s.
	 * @param tags the additional tags to attach to each {@link Meter}
	 * @throws NullPointerException if {@code meterRegistry} is {@code null}
	 */
	public MicrometerResponderRSocketInterceptor(MeterRegistry meterRegistry,
			Tag... tags) {
		this.meterRegistry = Objects.requireNonNull(meterRegistry,
				"meterRegistry must not be null");
		this.tags = tags;
	}

	@Override
	public MicrometerResponderRSocket apply(RSocket delegate) {
		Objects.requireNonNull(delegate, "delegate must not be null");

		return new MicrometerResponderRSocket(delegate, meterRegistry, tags);
	}

}