org.pragmaticminds.crunch.sinks

Class PostgreSqlSink

java.lang.Object

org.pragmaticminds.crunch.sinks.PostgreSqlSink

All Implemented Interfaces:

Serializable, AutoCloseable, EventSink<GenericEvent>

public class PostgreSqlSink
extends Object
implements EventSink<GenericEvent>, Serializable, AutoCloseable

A Sink for persisting of GenericEvent List in a Events table on a PostgreSQL database.

Author:

Erwin Wagasow Created by Erwin Wagasow on 11.09.2018

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
PostgreSqlSink(String url, String user, String password) Main constructor, builds up the connection to the PostgreSql database.

Method Summary

Modifier and Type	Method and Description
void	close() Closes the PostgreSQL connection.
List<GenericEvent>	executeQuery(String query) Runs the given query on the database connected and gets results in GenericEvent type as a List.
void	handle(GenericEvent event) Is called by the pipeline whenever a new GenericEvent is received.
void	persist(List<GenericEvent> events) Saves the List of GenericEvents into the connected PostgreSQL database.

Methods inherited from class java.lang.Object

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

Constructor Detail

PostgreSqlSink

public PostgreSqlSink(String url,
                      String user,
                      String password)

Main constructor, builds up the connection to the PostgreSql database.

Parameters:

url - of the database

user - of the database

password - of the user of the database

Method Detail

executeQuery

public List<GenericEvent> executeQuery(String query)

Runs the given query on the database connected and gets results in GenericEvent type as a List.

Parameters:

query - to be executed (Only select methods and similar, no create or insert and so on).

Returns:

a List of GenericEvent results from the executed query.

persist

public void persist(List<GenericEvent> events)

Saves the List of GenericEvents into the connected PostgreSQL database.

Parameters:

events - to be saved into the database.

handle

public void handle(GenericEvent event)

Is called by the pipeline whenever a new GenericEvent is received. This method persists the given GenericEvent value in the PostgreSQL database.

Specified by:

handle in interface EventSink<GenericEvent>

Parameters:

event - GenericEvent that is generated by the pipeline.

close

public void close()

Closes the PostgreSQL connection.

Specified by:

close in interface AutoCloseable