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Apache Jena Fuseki server Kafka connector
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/*
 * 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.kafka.common.telemetry.internals;

import java.time.Duration;
import org.apache.kafka.common.KafkaException;
import org.apache.kafka.common.Uuid;
import org.apache.kafka.common.errors.InterruptException;
import org.apache.kafka.common.requests.AbstractRequest.Builder;
import org.apache.kafka.common.requests.GetTelemetrySubscriptionsResponse;
import org.apache.kafka.common.requests.PushTelemetryResponse;

import java.util.Optional;

/**
 * The interface used by the `NetworkClient` to send telemetry requests.
 */
public interface ClientTelemetrySender extends AutoCloseable {

    /**
     * Return the next time when the telemetry API should be attempted (i.e., interval time has elapsed).
     * 
     * If another telemetry API is in-flight, then {@code timeoutMs} should be returned as the
     * maximum wait time.
     *
     * @param timeoutMs The timeout for the inflight telemetry API call.
     * @return remaining time in ms till the telemetry API be attempted again.
     */
    long timeToNextUpdate(long timeoutMs);

    /**
     * Return the telemetry request based on client state i.e. determine if
     * {@link org.apache.kafka.common.requests.GetTelemetrySubscriptionsRequest} or
     * {@link org.apache.kafka.common.requests.PushTelemetryRequest} be constructed.
     *
     * @return request for telemetry API call.
     */
    Optional> createRequest();

    /**
     * Handle successful response for get telemetry subscriptions request.
     *
     * @param response subscriptions telemetry API response
     */
    void handleResponse(GetTelemetrySubscriptionsResponse response);

    /**
     * Handle successful response for push telemetry request.
     *
     * @param response push telemetry API response
     */
    void handleResponse(PushTelemetryResponse response);

    /**
     * Handle get telemetry subscriptions request failure.
     *
     * @param kafkaException the fatal exception.
     */
    void handleFailedGetTelemetrySubscriptionsRequest(KafkaException kafkaException);

    /**
     * Handle push telemetry request failure.
     *
     * @param kafkaException the fatal exception.
     */
    void handleFailedPushTelemetryRequest(KafkaException kafkaException);

    /**
     * Determines the client's unique client instance ID used for telemetry. This ID is unique to
     * the specific enclosing client instance and will not change after it is initially generated.
     * The ID is useful for correlating client operations with telemetry sent to the broker and
     * to its eventual monitoring destination(s).
     * 
     * This method waits up to timeout for the subscription to become available in
     * order to complete the request.
     *
     * @param timeout The maximum time to wait for enclosing client instance to determine its
     *                client instance ID. The value must be non-negative. Specifying a timeout
     *                of zero means do not wait for the initial request to complete if it hasn't
     *                already.
     * @throws InterruptException If the thread is interrupted while blocked.
     * @throws KafkaException If an unexpected error occurs while trying to determine the client
     *                        instance ID, though this error does not necessarily imply the
     *                        enclosing client instance is otherwise unusable.
     * @throws IllegalArgumentException If the timeout is negative.
     *
     * @return If present, optional of the client's assigned instance id used for metrics collection.
     */

    Optional clientInstanceId(Duration timeout);

    /**
     * Initiates shutdown of this client. This method is called when the enclosing client instance
     * is being closed. This method should not throw an exception if the client is already closed.
     *
     * @param timeoutMs The maximum time to wait for the client to close.
     */
    void initiateClose(long timeoutMs);
}