/*
 * 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.flink.queryablestate.network.stats;

/** Simple statistics for monitoring the state server and the client proxy. */
public interface KvStateRequestStats {

    /** Reports an active connection. */
    void reportActiveConnection();

    /** Reports an inactive connection. */
    void reportInactiveConnection();

    /** Reports an incoming request. */
    void reportRequest();

    /**
     * Reports a successfully handled request.
     *
     * @param durationTotalMillis Duration of the request (in milliseconds).
     */
    void reportSuccessfulRequest(long durationTotalMillis);

    /** Reports a failure during a request. */
    void reportFailedRequest();
}
