streams.esper

Class EsperTrimmedStatementSubscriber

java.lang.Object

streams.esper.EsperStatementSubscriber

streams.esper.EsperTrimmedStatementSubscriber

public class EsperTrimmedStatementSubscriber
extends EsperStatementSubscriber

Removes the '`' characters from the keys as being output by Esper. This class hence allows an efficient default implementation and applied this expensive String operation only when explicitly required for a Query.

Since:

0.3.0

Version:

0.3.0

Author:

Thomas Scharrenbach

Field Summary

Fields inherited from class streams.esper.EsperStatementSubscriber

KEY_STREAM

Constructor Summary

Constructors

Constructor and Description
EsperTrimmedStatementSubscriber(List<stream.io.Sink> sinksList, String[] keys) Create a new subscriber with the specified keys writing to the specified Sink.

Method Summary

Methods

Modifier and Type	Method and Description
void	update(Map<String,Serializable> values) For including special characters, Esper requires names of keys to be surrounded by '`'.

Methods inherited from class streams.esper.EsperStatementSubscriber

update, write

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EsperTrimmedStatementSubscriber

public EsperTrimmedStatementSubscriber(List<stream.io.Sink> sinksList,
                               String[] keys)

Create a new subscriber with the specified keys writing to the specified Sink.

Parameters:

sinksList -

keys -

Since:

0.0.1

Method Detail

update

public void update(Map<String,Serializable> values)
            throws Exception

For including special characters, Esper requires names of keys to be surrounded by '`'. For example, the key myDataItem:timestamp would have to be expressed as `myDataItem:timestamp`. Since the streams framework requires no such action, we have to remove these characters before sending the output of the Esper engine to the Streams framework.

Overrides:

update in class EsperStatementSubscriber

Parameters:

values - the values of an Esper event.

Throws:

Exception

Since:

0.3.0