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package org.apache.qpid.util.concurrent;
/**
* A SynchRef is an interface which is returned from the synchronous take and drain methods of {@link BatchSynchQueue},
* allowing call-backs to be made against the synchronizing strucutre. It allows the consumer to communicate when it
* wants producers that have their data taken to be unblocked.
*
* <p/><table id="crc"><caption>CRC Card</caption>
* <tr><th> Responsibilities
* <tr><td> Report number of records returned by a taking operation.
* <tr><td> Provide call-back to release producers of taken records.
* </table>
*/
public interface SynchRef
{
/**
* Reports the number of records taken by the take or drain operation.
*
* @return The number of records taken by the take or drain operation.
*/
public int getNumRecords();
/**
* Any producers that have had their data elements taken from the queue but have not been unblocked are
* unblocked when this method is called. The exception to this is producers that have had their data put back
* onto the queue by a consumer. Producers that have had exceptions for their data items registered by consumers
* will be unblocked but will not return from their put call normally, but with an exception instead.
*/
public void unblockProducers();
}
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