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Java library for Azure Service Bus. Please note, a newer package com.azure:azure-messaging-servicebus for Azure Service Bus is available as of December 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/sb for more details.

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

package com.microsoft.azure.servicebus;

import java.util.Collection;
import java.util.concurrent.CompletableFuture;

import com.microsoft.azure.servicebus.primitives.ServiceBusException;

/**
 * Represents a message browser that can browse messages from Azure Service Bus.
 */
public interface IMessageBrowser {

    /**
     * reads next the active message without changing the state of the receiver or the message source.
     * The first call to {@link IMessageBrowser#peek()} fetches the first active message for this receiver.
     * Each subsequent call fetches the subsequent message in the entity.
     *
     * @return {@link Message} peeked
     * @throws InterruptedException if the current thread was interrupted while waiting
     * @throws ServiceBusException  if peek failed
     */
    IMessage peek() throws InterruptedException, ServiceBusException;

    /**
     * Reads next the active message without changing the state of the receiver or the message source.
     *
     * @param fromSequenceNumber The sequence number from where to read the message.
     * @return {@link Message} peeked
     * @throws InterruptedException if the current thread was interrupted while waiting
     * @throws ServiceBusException  if peek failed
     */
    IMessage peek(long fromSequenceNumber) throws InterruptedException, ServiceBusException;

    /**
     * Reads next batch of the active messages without changing the state of the receiver or the message source.
     *
     * @param messageCount The number of messages.
     * @return Batch of {@link Message} peeked
     * @throws InterruptedException if the current thread was interrupted while waiting
     * @throws ServiceBusException  if peek failed
     */
    Collection peekBatch(int messageCount) throws InterruptedException, ServiceBusException;

    /**
     * Reads next batch of the active messages without changing the state of the receiver or the message source.
     *
     * @param fromSequenceNumber The sequence number from where to read the message.
     * @param messageCount       The number of messages.
     * @return Batch of {@link Message} peeked
     * @throws InterruptedException if the current thread was interrupted while waiting
     * @throws ServiceBusException  if peek failed
     */
    Collection peekBatch(long fromSequenceNumber, int messageCount) throws InterruptedException, ServiceBusException;

    /**
     * Asynchronously reads the active messages without changing the state of the receiver or the message source.
     *
     * @return {@link Message} peeked
     */
    CompletableFuture peekAsync();

    /**
     * Asynchronously reads next the active message without changing the state of the receiver or the message source.
     *
     * @param fromSequenceNumber The sequence number from where to read the message.
     * @return CompletableFuture that returns {@link Message} peeked.
     */
    CompletableFuture peekAsync(long fromSequenceNumber);

    /**
     * Asynchronously reads the next batch of active messages without changing the state of the receiver or the message source.
     *
     * @param messageCount The number of messages.
     * @return CompletableFuture that returns batch of {@link Message} peeked.
     */
    CompletableFuture> peekBatchAsync(int messageCount);

    /**
     * Asynchronously reads the next batch of active messages without changing the state of the receiver or the message source.
     *
     * @param fromSequenceNumber The sequence number from where to read the message.
     * @param messageCount       The number of messages.
     * @return CompletableFuture that returns batch of {@link Message} peeked.
     */
    CompletableFuture> peekBatchAsync(long fromSequenceNumber, int messageCount);
}