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Client library for working with the NATS messaging system.

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// 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;

import io.nats.client.api.ConsumerInfo;

import java.io.IOException;

/**
 * The Consumer Context provides a convenient interface around a defined JetStream Consumer
 *  Note: ConsumerContext requires a pull consumer.
 *  For basic usage examples see {@link JetStream JetStream}
 */
public interface ConsumerContext extends BaseConsumerContext {
    /**
     * Gets information about the consumer behind this subscription.
     * @return consumer information
     * @throws IOException covers various communication issues with the NATS
     *         server such as timeout or interruption
     * @throws JetStreamApiException the request had an error related to the data
     */
    ConsumerInfo getConsumerInfo() throws IOException, JetStreamApiException;

    /**
     * Gets information about the consumer behind this subscription.
     * This returns the last read version of Consumer Info, which could technically be out of date.
     * @return consumer information
     */
    ConsumerInfo getCachedConsumerInfo();
}