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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. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license information.

package com.microsoft.azure.servicebus;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

final class MessageBrowser implements IMessageBrowser {
    private static final Logger TRACE_LOGGER = LoggerFactory.getLogger(MessageBrowser.class);
    private long lastPeekedSequenceNumber = 0;
    private boolean isReceiveSideBrowser = false;
    private MessageReceiver messageReceiver = null;
    private MessageSender messageSender = null;

    public MessageBrowser(MessageReceiver messageReceiver) {
        this.messageReceiver = messageReceiver;
        this.isReceiveSideBrowser = true;
    }

    public MessageBrowser(MessageSender messageSender) {
        this.messageSender = messageSender;
        this.isReceiveSideBrowser = false;
    }

    @Override
    public IMessage peek() throws InterruptedException, ServiceBusException {
        return Utils.completeFuture(this.peekAsync());
    }

    @Override
    public IMessage peek(long fromSequenceNumber) throws InterruptedException, ServiceBusException {
        return Utils.completeFuture(this.peekAsync(fromSequenceNumber));
    }

    @Override
    public Collection peekBatch(int messageCount) throws InterruptedException, ServiceBusException {
        return Utils.completeFuture(this.peekBatchAsync(messageCount));
    }

    @Override
    public Collection peekBatch(long fromSequenceNumber, int messageCount) throws InterruptedException, ServiceBusException {
        return Utils.completeFuture(this.peekBatchAsync(fromSequenceNumber, messageCount));
    }

    @Override
    public CompletableFuture peekAsync() {
        return this.peekAsync(this.lastPeekedSequenceNumber + 1);
    }

    @Override
    public CompletableFuture peekAsync(long fromSequenceNumber) {
        return this.peekBatchAsync(fromSequenceNumber, 1).thenApplyAsync((c) ->
        {
            IMessage message = null;
            Iterator iterator = c.iterator();
            if (iterator.hasNext()) {
                message = iterator.next();
                iterator.remove();
            }
            return message;
        }, MessagingFactory.INTERNAL_THREAD_POOL);
    }

    @Override
    public CompletableFuture> peekBatchAsync(int messageCount) {
        return this.peekBatchAsync(this.lastPeekedSequenceNumber + 1, messageCount);
    }

    @Override
    public CompletableFuture> peekBatchAsync(long fromSequenceNumber, int messageCount) {
        CompletableFuture> peekFuture;
        if (this.isReceiveSideBrowser) {
            String sessionId = this.messageReceiver.isSessionReceiver() ? this.messageReceiver.getInternalReceiver().getSessionId() : null;
            TRACE_LOGGER.debug("Browsing '{}' messages from entity '{}' in sessionId '{}' from sequence number '{}'", messageCount, this.messageReceiver.getEntityPath(), sessionId, fromSequenceNumber);
            peekFuture = this.messageReceiver.getInternalReceiver().peekMessagesAsync(fromSequenceNumber, messageCount, sessionId);
        } else {
            TRACE_LOGGER.debug("Browsing '{}' messages from entity '{}' from sequence number '{}'", messageCount, this.messageSender.getEntityPath(), fromSequenceNumber);
            peekFuture = this.messageSender.getInternalSender().peekMessagesAsync(fromSequenceNumber, messageCount);
        }

        return peekFuture.thenApplyAsync((peekedMessages) ->
        {
            ArrayList convertedMessages = new ArrayList();
            if (peekedMessages != null) {
                TRACE_LOGGER.debug("Browsing messages from sequence number '{}' returned '{}' messages", fromSequenceNumber, peekedMessages.size());
                long sequenceNumberOfLastMessage = 0;
                for (org.apache.qpid.proton.message.Message message : peekedMessages) {
                    Message convertedMessage = MessageConverter.convertAmqpMessageToBrokeredMessage(message);
                    sequenceNumberOfLastMessage = convertedMessage.getSequenceNumber();
                    convertedMessages.add(convertedMessage);
                }

                if (sequenceNumberOfLastMessage > 0) {
                    this.lastPeekedSequenceNumber = sequenceNumberOfLastMessage;
                }
            } else {
                TRACE_LOGGER.debug("Browsing messages from sequence number '{}' returned no messages", fromSequenceNumber);
            }

            return convertedMessages;
        }, MessagingFactory.INTERNAL_THREAD_POOL);
    }
}