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The metrics module of dubbo project

There is a newer version: 3.3.4

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.dubbo.metrics.service;

import org.apache.dubbo.common.extension.ExtensionScope;
import org.apache.dubbo.common.extension.SPI;

/**
 * The exporter of {@link MetricsService}
 */
@SPI(value = "default", scope = ExtensionScope.APPLICATION)
public interface MetricsServiceExporter {

    /**
     * Initialize exporter
     */
    void init();

    /**
     * Exports the {@link MetricsService} as a Dubbo service
     *
     * @return {@link MetricsServiceExporter itself}
     */
    MetricsServiceExporter export();

    /**
     * Unexports the {@link MetricsService}
     *
     * @return {@link MetricsServiceExporter itself}
     */
    MetricsServiceExporter unexport();
}