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Client library for working with the NATS messaging system.
// Copyright 2022 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 java.time.Duration;
/**
* This interface provides push like ability for a pull consumer. Was the pre-cursor to simplified consume.
*/
public interface JetStreamReader {
/**
* Read the next message. Return null if the calls times out.
* Use a timeout of 0 to wait indefinitely. This could still be interrupted if
* the subscription is unsubscribed or the client connection is closed.
* @param timeout the maximum time to wait
* @return the next message for this subscriber or null if there is a timeout
* @throws InterruptedException if one is thrown, in order to propagate it up
* @throws IllegalStateException if the subscription belongs to a dispatcher, or is not active
*/
Message nextMessage(Duration timeout) throws InterruptedException;
/**
* Read the next message. Return null if the calls times out.
* Use a timeout of 0 to wait indefinitely. This could still be interrupted if
* the subscription is unsubscribed or the client connection is closed.
* @param timeoutMillis the maximum time to wait
* @return the next message for this subscriber or null if there is a timeout
* @throws InterruptedException if one is thrown, in order to propagate it up
* @throws IllegalStateException if the subscription belongs to a dispatcher, or is not active
*/
Message nextMessage(long timeoutMillis) throws InterruptedException;
/**
* Stop getting more messages from the server. Some messages may have already arrived and
* are in the buffer, so continue to call nextMessage until a null is returned.
*/
void stop();
}
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