1 /*******************************************************************************
2 * ============LICENSE_START=======================================================
4 * ================================================================================
5 * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
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15 * See the License for the specific language governing permissions and
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17 * ============LICENSE_END=========================================================
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21 *******************************************************************************/
22 package org.onap.dmaap.dmf.mr.metrics.publisher;
24 import java.io.IOException;
27 * This interface will provide fetch mechanism for consumer
28 * @author nilanjana.maity
31 public interface CambriaConsumer extends CambriaClient
34 * Fetch a set of messages. The consumer's timeout and message limit are used if set in the constructor call.
36 * @return a set of messages
39 Iterable<String> fetch () throws IOException;
42 * Fetch a set of messages with an explicit timeout and limit for this call. These values
43 * override any set in the constructor call.
45 * @param timeoutMs The amount of time in milliseconds that the server should keep the connection
46 * open while waiting for message traffic. Use -1 for default timeout (controlled on the server-side).
47 * @param limit A limit on the number of messages returned in a single call. Use -1 for no limit.
48 * @return a set messages
49 * @throws IOException if there's a problem connecting to the server
51 Iterable<String> fetch ( int timeoutMs, int limit ) throws IOException;