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Please note, a newer package azure-messaging-eventhubs for Azure Event Hubs is available at https://search.maven.org/artifact/com.azure/azure-messaging-eventhubs as of February 2020. While this package will continue to receive critical bug fixes, we strongly encourage you to upgrade. Read the migration guide at https://aka.ms/azsdk/java/migrate/eh for more details.

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

package com.microsoft.azure.eventhubs;

/**
 * The handler to invoke after receiving {@link EventData}s from Microsoft Azure EventHubs. Use any implementation of this abstract class to specify
 * user action when using PartitionReceiver's setReceiveHandler().
 *
 * @see PartitionReceiver#setReceiveHandler
 */
public interface PartitionReceiveHandler {

    /**
     * Maximum number of {@link EventData} to supply while invoking {@link #onReceive(Iterable)}
     * Ensure that the value should be less than or equal to the value of {@link ReceiverOptions#getPrefetchCount()}
     *
     * @return value indicating the maximum number of {@link EventData} to supply while invoking {@link #onReceive(Iterable)}
     */
    int getMaxEventCount();

    /**
     * user should implement this method to specify the action to be performed on the received events.
     *
     * @param events the list of fetched events from the corresponding PartitionReceiver.
     * @see PartitionReceiver#receive
     */
    void onReceive(Iterable events);

    /**
     * Implement this method to Listen to errors which lead to Closure of the {@link PartitionReceiveHandler} pump.
     *
     * @param error fatal error encountered while running the {@link PartitionReceiveHandler} pump
     */
    void onError(Throwable error);
}