Class PriorityStream
- java.lang.Object
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- org.apache.solr.client.solrj.io.stream.TupleStream
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- org.apache.solr.client.solrj.io.stream.PriorityStream
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- All Implemented Interfaces:
Closeable
,Serializable
,AutoCloseable
,Expressible
,org.apache.solr.common.MapSerializable
,org.apache.solr.common.MapWriter
,org.apache.solr.common.NavigableObject
,org.noggit.JSONWriter.Writable
public class PriorityStream extends TupleStream implements Expressible
The priority function wraps two topics that represent high priority and low priority task queues. Each time the priority function is called it will check to see if there are any high priority tasks in the queue. If there are high priority tasks, then the high priority queue will be read until it returns the EOF Tuple.If there are no tasks in the high priority queue, then the lower priority task queue will be opened and read until the EOF Tuple is returned.
The scheduler is designed to be wrapped by the executor function and a daemon function can be used to call the executor iteratively.
- Since:
- 6.4.0
- See Also:
- Serialized Form
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Nested Class Summary
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Nested classes/interfaces inherited from class org.apache.solr.client.solrj.io.stream.TupleStream
TupleStream.IgnoreException
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Constructor Summary
Constructors Constructor Description PriorityStream(StreamExpression expression, StreamFactory factory)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description List<TupleStream>
children()
void
close()
int
getCost()
StreamComparator
getStreamSort()
void
open()
Tuple
read()
void
setStreamContext(StreamContext streamContext)
Explanation
toExplanation(StreamFactory factory)
Returns an explanation about the stream objectStreamExpression
toExpression(StreamFactory factory)
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Methods inherited from class org.apache.solr.client.solrj.io.stream.TupleStream
getShards, getShards, getStreamNodeId, writeMap
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Constructor Detail
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PriorityStream
public PriorityStream(StreamExpression expression, StreamFactory factory) throws IOException
- Throws:
IOException
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Method Detail
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toExpression
public StreamExpression toExpression(StreamFactory factory) throws IOException
- Specified by:
toExpression
in interfaceExpressible
- Throws:
IOException
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toExplanation
public Explanation toExplanation(StreamFactory factory) throws IOException
Description copied from interface:Expressible
Returns an explanation about the stream object- Specified by:
toExplanation
in interfaceExpressible
- Specified by:
toExplanation
in classTupleStream
- Parameters:
factory
- Stream factory for this, contains information about the function name- Returns:
- Explanation about this stream object containing explanations of any child stream objects
- Throws:
IOException
- throw on any error
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setStreamContext
public void setStreamContext(StreamContext streamContext)
- Specified by:
setStreamContext
in classTupleStream
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children
public List<TupleStream> children()
- Specified by:
children
in classTupleStream
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open
public void open() throws IOException
- Specified by:
open
in classTupleStream
- Throws:
IOException
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close
public void close() throws IOException
- Specified by:
close
in interfaceAutoCloseable
- Specified by:
close
in interfaceCloseable
- Specified by:
close
in classTupleStream
- Throws:
IOException
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read
public Tuple read() throws IOException
- Specified by:
read
in classTupleStream
- Throws:
IOException
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getStreamSort
public StreamComparator getStreamSort()
- Specified by:
getStreamSort
in classTupleStream
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getCost
public int getCost()
- Overrides:
getCost
in classTupleStream
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