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/*******************************************************************************
* ============LICENSE_START=======================================================
* org.onap.dmaap
* ================================================================================
* Copyright © 2017 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*
* ECOMP is a trademark and service mark of AT&T Intellectual Property.
*
*******************************************************************************/
package org.onap.dmaap.dmf.mr.backends;
/**
* A consumer interface. Consumers pull the next message from a given topic.
* @author peter
*/
public interface Consumer
{
/**
* A message interface provide the offset and message
* @author nilanjana.maity
*
*/
public interface Message
{
/**
* returning the offset of that particular message
* @return long
*/
long getOffset ();
/**
* returning the message
* @return message
*/
String getMessage ();
}
/**
* Get this consumer's name
* @return name
*/
String getName ();
/**
* Get creation time in ms
* @return
*/
long getCreateTimeMs ();
/**
* Get last access time in ms
* @return
*/
long getLastAccessMs ();
/**
* Get the next message from this source. This method must not block.
* @return the next message, or null if none are waiting
*/
Message nextMessage ();
/**
* Get the next message from this source. This method must not block.
* @param atOffset start with the next message at or after atOffset. -1 means next from last request
* @return the next message, or null if none are waiting
*/
/**
* Close/clean up this consumer
* @return
*/
boolean close();
/**
* Commit the offset of the last consumed message
*
*/
void commitOffsets();
/**
* Get the offset this consumer is currently at
* @return offset
*/
long getOffset();
void setOffset(long offset);
}
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