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Client library for working with the NATS messaging system.

There is a newer version: 2.20.5

// Copyright 2020-2023 The NATS Authors
// Licensed 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 io.nats.client.impl;

import io.nats.client.*;
import io.nats.client.api.ConsumerInfo;

import java.io.IOException;
import java.time.Duration;

class NatsIterableConsumer extends NatsMessageConsumer implements IterableConsumer {

    NatsIterableConsumer(SimplifiedSubscriptionMaker subscriptionMaker, ConsumerInfo cachedConsumerInfo, ConsumeOptions opts) throws IOException, JetStreamApiException {
        super(subscriptionMaker, cachedConsumerInfo, opts, null, null);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Message nextMessage(Duration timeout) throws InterruptedException, JetStreamStatusCheckedException {
        try {
            Message msg = sub.nextMessage(timeout);
            if (msg != null && stopped.get() && pmm.noMorePending()) {
                finished.set(true);
            }
            return msg;
        }
        catch (JetStreamStatusException e) {
            throw new JetStreamStatusCheckedException(e);
        }
        catch (IllegalStateException i) {
            // this happens if the consumer is stopped, since it is
            // drained/unsubscribed, so don't pass it on if it's expected
            return null;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public Message nextMessage(long timeoutMillis) throws InterruptedException, JetStreamStatusCheckedException {
        return nextMessage(Duration.ofMillis(timeoutMillis));
    }
}