com.informix.smartTrigger

Class IfxSmartTrigger

java.lang.Object

java.lang.Thread

com.informix.smartTrigger.IfxSmartTrigger

All Implemented Interfaces:

IfmxThreadedSmartTrigger, java.lang.AutoCloseable, java.lang.Runnable

public class IfxSmartTrigger
extends java.lang.Thread
implements IfmxThreadedSmartTrigger

Defines a Smart Trigger interface with the Informix server Using Informix Smart Trigger API (Informix server 12.10.xC9 or higher) this class encapsulates the setup for registering one or more smart triggers on the server Each smart trigger defined will have a callback method that returns data streamed from the Informix server when the specified conditions are met. For details on restrictions for the queries used to define the smart trigger conditions consult the Informix server documentation.

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Thread

java.lang.Thread.State, java.lang.Thread.UncaughtExceptionHandler

Field Summary

Fields inherited from class java.lang.Thread

MAX_PRIORITY, MIN_PRIORITY, NORM_PRIORITY

Constructor Summary

Constructors

Constructor and Description
IfxSmartTrigger(javax.sql.DataSource source) Creates a smart trigger object with a connection made by the provided datasource
IfxSmartTrigger(java.lang.String connectionUrl) Creates a smart trigger object with a connection made by the provided URL
IfxSmartTrigger(java.lang.String connectionUrl, java.util.Properties prop) Creates a smart trigger object with a connection made by the provided URL

Method Summary

Methods

Modifier and Type	Method and Description
void	addTrigger(java.lang.String tableName, java.lang.String tableOwnerName, java.lang.String databaseName, java.lang.String sqlQuery, IfmxSmartTriggerCallback... callback) Sets a watch on a particular table using a query using the default label
void	addTrigger(java.lang.String tableName, java.lang.String tableOwnerName, java.lang.String databaseName, java.lang.String sqlQuery, java.lang.String label, IfmxSmartTriggerCallback... callback) Sets a watch on a particular table using a query using the default label
IfmxThreadedSmartTrigger	buffer(int bufferSize) Sets the buffer size for the data that will be held here in the client This should be set to a size that will collect the number of records you can get at a time as well as the 2 times the size of the JSON document that will be returned.
void	close() Attempts to shutdown the internal connection that is watching for events If another thread is actively watching for events, this close is queued until an event is triggered (an event can be an operation that the user is watching for or a timeout event from the server).
IfmxThreadedSmartTrigger	commitTime(long time) Advanced option to restart your smart trigger from a commit time that was reported from a prior Smart Trigger session
java.util.List<java.lang.String>	getLabels() Returns a list of labels currently registered as triggers in this object
IfmxThreadedSmartTrigger	label(java.lang.String labelName) Set a default label for all triggers created by this object
IfmxThreadedSmartTrigger	maxRecordsPerRequest(int size) Sets how many records can be returned in a single event call This sets the maximum number of records returned if more than one record is sitting in the queue.
IfmxThreadedSmartTrigger	operationsCacheSize(int size) Sets the number of events/operations that the server will cache The number set here will be how many events the server will cache waiting on the client to retrieve them.
java.lang.String	readTriggerEvent() Reads a single smart trigger event from the server
void	registerTriggers() Registers all triggers that have been added/removed This must be called before any calls to readTriggerEvent() as this method make the server side calls to enable us to read the triggered events
void	removeTrigger(java.lang.String label) Removes one or more triggers based on the label provided If you have already started the smart trigger, removing triggers will be queued until a timeout or a trigger is executed.
void	removeTrigger(java.lang.String tableName, java.lang.String tableOwnerName, java.lang.String databaseName) Stops a trigger on a particular table/owner/database If you have already started the smart trigger, removing triggers will be queued until a timeout or a trigger is executed.
void	run()
IfmxThreadedSmartTrigger	timeout(int timeout) Sets the timeout for waiting for events from the server If no event is triggered after this timeout, a timeout event is fired, allowing the class to check if the user has made any changes to it's watch list or requested the connection to the server to be closed.
IfmxThreadedSmartTrigger	transactionID(long id) Advanced option to restart your smart trigger from a transaction id that was reported from a prior Smart Trigger session
void	watch() Starts watching for smart triggers You must call this (or run() if you are executing this as a thread) to actually start watching for smart triggers This method will block forever, until the thread is interrupted or another thread calls the close() method.

Methods inherited from class java.lang.Thread

activeCount, checkAccess, clone, countStackFrames, currentThread, destroy, dumpStack, enumerate, getAllStackTraces, getContextClassLoader, getDefaultUncaughtExceptionHandler, getId, getName, getPriority, getStackTrace, getState, getThreadGroup, getUncaughtExceptionHandler, holdsLock, interrupt, interrupted, isAlive, isDaemon, isInterrupted, join, join, join, resume, setContextClassLoader, setDaemon, setDefaultUncaughtExceptionHandler, setName, setPriority, setUncaughtExceptionHandler, sleep, sleep, start, stop, stop, suspend, toString, yield

Methods inherited from class java.lang.Object

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

Constructor Detail

IfxSmartTrigger

public IfxSmartTrigger(javax.sql.DataSource source)
                throws java.sql.SQLException

Creates a smart trigger object with a connection made by the provided datasource

Parameters:

source - A datasource object to make a connection with

Throws:

java.sql.SQLException

IfxSmartTrigger

public IfxSmartTrigger(java.lang.String connectionUrl)
                throws java.sql.SQLException

Creates a smart trigger object with a connection made by the provided URL

Parameters:

connectionUrl - String URL which can be used to make a connection

Throws:

java.sql.SQLException

IfxSmartTrigger

public IfxSmartTrigger(java.lang.String connectionUrl,
               java.util.Properties prop)
                throws java.sql.SQLException

Creates a smart trigger object with a connection made by the provided URL

Parameters:

connectionUrl - String URL which can be used to make a connection

prop - Connection properties you want passed into the connection that is created

Throws:

java.sql.SQLException

Method Detail

run

public void run()

Specified by:

run in interface java.lang.Runnable

Overrides:

run in class java.lang.Thread

label

public IfmxThreadedSmartTrigger label(java.lang.String labelName)

Set a default label for all triggers created by this object

Specified by:

label in interface IfmxThreadedSmartTrigger

Parameters:

labelName - A default label name

Returns:

this object

timeout

public IfmxThreadedSmartTrigger timeout(int timeout)

Sets the timeout for waiting for events from the server If no event is triggered after this timeout, a timeout event is fired, allowing the class to check if the user has made any changes to it's watch list or requested the connection to the server to be closed. The default timeout value is 60 seconds

Specified by:

timeout in interface IfmxThreadedSmartTrigger

Parameters:

timeout - The timeout used for waiting for events

Returns:

this object

buffer

public IfmxThreadedSmartTrigger buffer(int bufferSize)

Sets the buffer size for the data that will be held here in the client This should be set to a size that will collect the number of records you can get at a time as well as the 2 times the size of the JSON document that will be returned. Plus an addition 1024 bytes for metadata For Example: Given you expect 10 rows back that the JSON representation will be at most 150 bytes Your buffer should be AT LEAST 150 * 2 * 10 + 1024 bytes. By default the buffer size is 64 * 1024 + 1024 which means you can get 64 rows of a 512 byte JSON documents at a time.

Specified by:

buffer in interface IfmxThreadedSmartTrigger

Parameters:

bufferSize - Size in bytes for the buffer for this class

Returns:

this object

operationsCacheSize

public IfmxThreadedSmartTrigger operationsCacheSize(int size)

Sets the number of events/operations that the server will cache The number set here will be how many events the server will cache waiting on the client to retrieve them. Any addition events over this cache size will be lost if the client does not retrieve them quickly enough

Specified by:

operationsCacheSize in interface IfmxThreadedSmartTrigger

Parameters:

size - size of server side operations cache

Returns:

this object

maxRecordsPerRequest

public IfmxThreadedSmartTrigger maxRecordsPerRequest(int size)

Sets how many records can be returned in a single event call This sets the maximum number of records returned if more than one record is sitting in the queue. If you set to 0, then you get back all that are available.

Specified by:

maxRecordsPerRequest in interface IfmxThreadedSmartTrigger

Parameters:

size - records in a single request

Returns:

this object

commitTime

public IfmxThreadedSmartTrigger commitTime(long time)

Advanced option to restart your smart trigger from a commit time that was reported from a prior Smart Trigger session

Specified by:

commitTime in interface IfmxThreadedSmartTrigger

Parameters:

time - time value from a prior operations JSON document returned from a smart trigger object

Returns:

this object

transactionID

public IfmxThreadedSmartTrigger transactionID(long id)

Advanced option to restart your smart trigger from a transaction id that was reported from a prior Smart Trigger session

Specified by:

transactionID in interface IfmxThreadedSmartTrigger

Parameters:

id - transaction id

Returns:

this object

close

public void close()
           throws java.sql.SQLException

Attempts to shutdown the internal connection that is watching for events If another thread is actively watching for events, this close is queued until an event is triggered (an event can be an operation that the user is watching for or a timeout event from the server). If another thread is not watching for events (is not currently in the watch() method) this method will attempt to close the underlying SQL connection

Specified by:

close in interface IfmxThreadedSmartTrigger

Specified by:

close in interface java.lang.AutoCloseable

Throws:

java.sql.SQLException

addTrigger

public void addTrigger(java.lang.String tableName,
              java.lang.String tableOwnerName,
              java.lang.String databaseName,
              java.lang.String sqlQuery,
              IfmxSmartTriggerCallback... callback)
                throws java.sql.SQLException

Sets a watch on a particular table using a query using the default label

Sets up a watch to a given table/owner/database using a simple SQL query. See the corresponding Informix documentation on which SQL Queries are valid.

You can pass in callback objects here or register callbacks later against a label using registerCallback(...) The user who is connected to the database from this class must have read permission on the table you are attempting to watch as well as sysadmin databse access. For details see the Informix server documentation. If you have already started the smart trigger, adding additional triggers will be queued until a timeout or a trigger is executed.

Specified by:

addTrigger in interface IfmxThreadedSmartTrigger

Parameters:

tableName - name of the table to watch

tableOwnerName - owner of the table

databaseName - database the table resides in

sqlQuery - the SQL query that will validate if a change should trigger a message

callback - a list of zero or more callback objects that will be executed when a trigger is fired.

Throws:

java.sql.SQLException

addTrigger

public void addTrigger(java.lang.String tableName,
              java.lang.String tableOwnerName,
              java.lang.String databaseName,
              java.lang.String sqlQuery,
              java.lang.String label,
              IfmxSmartTriggerCallback... callback)
                throws java.sql.SQLException

Sets a watch on a particular table using a query using the default label

Sets up a watch to a given table/owner/database using a simple SQL query. See the corresponding Informix documentation on which SQL Queries are valid.

You can pass in callback objects here or register callbacks later against a label using registerCallback(...) The user who is connected to the database from this class must have read permission on the table you are attempting to watch as well as sysadmin databse access. For details see the Informix server documentation. If you have already started the smart trigger, adding additional triggers will be queued until a timeout or a trigger is executed.

Specified by:

addTrigger in interface IfmxThreadedSmartTrigger

Parameters:

tableName - name of the table to watch

tableOwnerName - owner of the table

databaseName - database the table resides in

sqlQuery - the SQL query that will validate if a change should trigger a message

label - the label you want to use to identify/correlate one or more triggers

callback - a list of zero or more callback objects that will be executed when a trigger is fired.

Throws:

java.sql.SQLException

removeTrigger

public void removeTrigger(java.lang.String tableName,
                 java.lang.String tableOwnerName,
                 java.lang.String databaseName)
                   throws java.sql.SQLException

Stops a trigger on a particular table/owner/database If you have already started the smart trigger, removing triggers will be queued until a timeout or a trigger is executed.

Specified by:

removeTrigger in interface IfmxThreadedSmartTrigger

Parameters:

tableName - table to stop watching

tableOwnerName - owner of the table

databaseName - database where the table resides

Throws:

java.sql.SQLException

removeTrigger

public void removeTrigger(java.lang.String label)
                   throws java.sql.SQLException

Removes one or more triggers based on the label provided If you have already started the smart trigger, removing triggers will be queued until a timeout or a trigger is executed.

Specified by:

removeTrigger in interface IfmxThreadedSmartTrigger

Parameters:

label - label to remove

Throws:

java.sql.SQLException

registerTriggers

public void registerTriggers()
                      throws java.sql.SQLException

Registers all triggers that have been added/removed This must be called before any calls to readTriggerEvent() as this method make the server side calls to enable us to read the triggered events

Throws:

java.sql.SQLException

getLabels

public java.util.List<java.lang.String> getLabels()

Returns a list of labels currently registered as triggers in this object

Specified by:

getLabels in interface IfmxThreadedSmartTrigger

Returns:

list list of labels

watch

public void watch()
           throws java.sql.SQLException

Starts watching for smart triggers You must call this (or run() if you are executing this as a thread) to actually start watching for smart triggers This method will block forever, until the thread is interrupted or another thread calls the close() method. Note if you set your timeout() to zero, this will block until interrupted only. It will never close on it's own. It's recommended to always have some timeout so the loop here has a chance to take any actions, including adding/removing triggers or closing down. As smart triggers are caught from the server, this call will route them to the appropriate callback object you specified when you set up the smart trigger. Missed records or timeouts are automatically sent to all callback objects

Specified by:

watch in interface IfmxThreadedSmartTrigger

Throws:

java.sql.SQLException

readTriggerEvent

public java.lang.String readTriggerEvent()
                                  throws java.sql.SQLException

Reads a single smart trigger event from the server

Returns:

String json of the event

Throws:

java.sql.SQLException