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org.apache.oozie.coord
Class CoordELFunctions

java.lang.Object
  org.apache.oozie.coord.CoordELFunctions

public class CoordELFunctions
extends Object

This class implements the EL function related to coordinator

Field Summary

static String	CONFIGURATION
static String	DIR_SEPARATOR
static String	INSTANCE_SEPARATOR

Constructor Summary

CoordELFunctions()

Method Summary

static void	configureEvaluator(ELEvaluator evaluator, SyncCoordDataset ds, SyncCoordAction coordAction) Configure an evaluator with data set and application specific information.
static String	coord_actualTime_echo()
static String	coord_conf(String property) Return a job configuration property for the coordinator.
static String	coord_days_echo(String n)
static String	coord_endOfDay_echo(String n)
static String	coord_endOfMonth_echo(String n)
static String	coord_hours_echo(String n)
static String	coord_minutes_echo(String n)
static String	coord_months_echo(String n)
static String	coord_user() Return the user that submitted the coordinator job.
static String	evalAndWrap(ELEvaluator eval, String expr) Helper method to wrap around with "${..}".
static String	ph1_coord_actionId_echo()
static String	ph1_coord_actualTime_echo_wrap()
static String	ph1_coord_current_echo(String n)
static String	ph1_coord_dataIn_echo(String n)
static String	ph1_coord_dataOut_echo(String n)
static String	ph1_coord_dateOffset_echo(String n, String offset, String unit)
static int	ph1_coord_days(int val) Used in defining the frequency in 'day' unit.
static String	ph1_coord_daysInMonth_echo(String n)
static int	ph1_coord_endOfDays(int val) Used in defining the frequency in 'day' unit and specify the "end of day" property.
static int	ph1_coord_endOfMonths(int val) Used in defining the frequency in 'month' unit and specify the "end of month" property.
static String	ph1_coord_formatTime_echo(String dateTime, String format)
static String	ph1_coord_future_echo(String n, String instance)
static int	ph1_coord_hours(int val) Used in defining the frequency in 'hour' unit.
static String	ph1_coord_hoursInDay_echo(String n)
static String	ph1_coord_latest_echo(String n)
static int	ph1_coord_minutes(int val) Used in defining the frequency in 'minute' unit.
static int	ph1_coord_months(int val) Used in defining the frequency in 'month' unit.
static String	ph1_coord_name_echo()
static String	ph1_coord_nominalTime_echo_fixed()
static String	ph1_coord_nominalTime_echo_wrap()
static String	ph1_coord_nominalTime_echo()
static String	ph1_coord_tzOffset_echo()
static String	ph2_coord_actionId() Return Action Id.
static String	ph2_coord_actualTime() Return Action Start time.
static String	ph2_coord_current_echo(String n)
static String	ph2_coord_current(int n) Determine the date-time in Oozie processing timezone of n-th dataset instance.
static String	ph2_coord_dateOffset(String strBaseDate, int offset, String unit) Returns the a date string while given a base date in 'strBaseDate', offset and unit (e.g.
static int	ph2_coord_daysInMonth(int n) Calculate number of days in one month for n-th dataset instance.
static String	ph2_coord_formatTime(String dateTimeStr, String format) Convert from standard date-time formatting to a desired format.
static String	ph2_coord_future_echo(String n, String instance)
static int	ph2_coord_hoursInDay(int n) Determine how many hours is on the date of n-th dataset instance.
static String	ph2_coord_latest_echo(String n)
static String	ph2_coord_name() Return Job Name.
static String	ph2_coord_nominalTime() Return nominal time or Action Creation Time.
static int	ph2_coord_tzOffset() Calculate the difference of timezone offset in minutes between dataset and coordinator job.
static String	ph3_coord_actionId()
static String	ph3_coord_actualTime()
static String	ph3_coord_dataIn(String dataInName) Used to specify a list of URI's that are used as input dir to the workflow job.
static String	ph3_coord_dataOut(String dataOutName) Used to specify a list of URI's that are output dir of the workflow job.
static String	ph3_coord_dateOffset(String strBaseDate, int offset, String unit)
static int	ph3_coord_daysInMonth(int n)
static String	ph3_coord_formatTime(String dateTimeStr, String format)
static String	ph3_coord_future(int n, int instance) Determine the date-time in Oozie processing timezone of n-th future available dataset instance from nominal Time but not beyond the instance specified as 'instance.
static int	ph3_coord_hoursInDay(int n)
static String	ph3_coord_latest(int n) Determine the date-time in Oozie processing timezone of n-th latest available dataset instance.
static String	ph3_coord_name()
static String	ph3_coord_nominalTime()
static int	ph3_coord_tzOffset()

Methods inherited from class java.lang.Object

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

Field Detail

CONFIGURATION

public static final String CONFIGURATION

See Also:

Constant Field Values

INSTANCE_SEPARATOR

public static final String INSTANCE_SEPARATOR

See Also:

Constant Field Values

DIR_SEPARATOR

public static final String DIR_SEPARATOR

See Also:

Constant Field Values

Constructor Detail

CoordELFunctions

public CoordELFunctions()

Method Detail

ph1_coord_days

public static int ph1_coord_days(int val)

Used in defining the frequency in 'day' unit.

domain: val > 0 and should be integer.

Parameters:

val - frequency in number of days.

Returns:

number of days and also set the frequency timeunit to "day"

ph1_coord_months

public static int ph1_coord_months(int val)

Used in defining the frequency in 'month' unit.

domain: val > 0 and should be integer.

Parameters:

val - frequency in number of months.

Returns:

number of months and also set the frequency timeunit to "month"

ph1_coord_hours

public static int ph1_coord_hours(int val)

Used in defining the frequency in 'hour' unit.

parameter value domain: val > 0 and should be integer.

Parameters:

val - frequency in number of hours.

Returns:

number of minutes and also set the frequency timeunit to "minute"

ph1_coord_minutes

public static int ph1_coord_minutes(int val)

Used in defining the frequency in 'minute' unit.

domain: val > 0 and should be integer.

Parameters:

val - frequency in number of minutes.

Returns:

number of minutes and also set the frequency timeunit to "minute"

ph1_coord_endOfDays

public static int ph1_coord_endOfDays(int val)

Used in defining the frequency in 'day' unit and specify the "end of day" property.

Every instance will start at 00:00 hour of each day.

domain: val > 0 and should be integer.

Parameters:

val - frequency in number of days.

Returns:

number of days and also set the frequency timeunit to "day" and end_of_duration flag to "day"

ph1_coord_endOfMonths

public static int ph1_coord_endOfMonths(int val)

Used in defining the frequency in 'month' unit and specify the "end of month" property.

Every instance will start at first day of each month at 00:00 hour.

domain: val > 0 and should be integer.

Parameters:

val: - frequency in number of months.

Returns:

number of months and also set the frequency timeunit to "month" and end_of_duration flag to "month"

ph2_coord_tzOffset

public static int ph2_coord_tzOffset()

Calculate the difference of timezone offset in minutes between dataset and coordinator job.

Depends on:

1. Timezone of both dataset and job

2. Action creation Time

Returns:

difference in minutes (DataSet TZ Offset - Application TZ offset)

ph3_coord_tzOffset

public static int ph3_coord_tzOffset()

ph2_coord_dateOffset

public static String ph2_coord_dateOffset(String strBaseDate,
                                          int offset,
                                          String unit)
                                   throws Exception

Returns the a date string while given a base date in 'strBaseDate', offset and unit (e.g. DAY, MONTH, HOUR, MINUTE, MONTH).

Parameters:

strBaseDate - -- base date

offset - -- any number

unit - -- DAY, MONTH, HOUR, MINUTE, MONTH

Returns:

date string

Throws:

Exception

ph3_coord_dateOffset

public static String ph3_coord_dateOffset(String strBaseDate,
                                          int offset,
                                          String unit)
                                   throws Exception

Throws:

Exception

ph3_coord_future

public static String ph3_coord_future(int n,
                                      int instance)
                               throws Exception

Determine the date-time in Oozie processing timezone of n-th future available dataset instance from nominal Time but not beyond the instance specified as 'instance.

It depends on:

1. Data set frequency

2. Data set Time unit (day, month, minute)

3. Data set Time zone/DST

4. End Day/Month flag

5. Data set initial instance

6. Action Creation Time

7. Existence of dataset's directory

Parameters:

n - :instance count

domain: n >= 0, n is integer

instance: - How many future instance it should check? value should be >=0

Returns:

date-time in Oozie processing timezone of the n-th instance

Throws:

Exception

ph2_coord_nominalTime

public static String ph2_coord_nominalTime()
                                    throws Exception

Return nominal time or Action Creation Time.

Returns:

coordinator action creation or materialization date time

Throws:

Exception - if unable to format the Date object to String

ph3_coord_nominalTime

public static String ph3_coord_nominalTime()
                                    throws Exception

Throws:

Exception

ph2_coord_formatTime

public static String ph2_coord_formatTime(String dateTimeStr,
                                          String format)
                                   throws Exception

Convert from standard date-time formatting to a desired format.

Parameters:

dateTimeStr - - A timestamp in standard (ISO8601) format.

format - - A string representing the desired format.

Returns:

coordinator action creation or materialization date time

Throws:

Exception - if unable to format the Date object to String

ph3_coord_formatTime

public static String ph3_coord_formatTime(String dateTimeStr,
                                          String format)
                                   throws Exception

Throws:

Exception

ph2_coord_actionId

public static String ph2_coord_actionId()
                                 throws Exception

Return Action Id.

Returns:

coordinator action Id

Throws:

Exception

ph3_coord_actionId

public static String ph3_coord_actionId()
                                 throws Exception

Throws:

Exception

ph2_coord_name

public static String ph2_coord_name()
                             throws Exception

Return Job Name.

Returns:

coordinator name

Throws:

Exception

ph3_coord_name

public static String ph3_coord_name()
                             throws Exception

Throws:

Exception

ph2_coord_actualTime

public static String ph2_coord_actualTime()
                                   throws Exception

Return Action Start time.

Returns:

coordinator action start time

Throws:

Exception - if unable to format the Date object to String

ph3_coord_actualTime

public static String ph3_coord_actualTime()
                                   throws Exception

Throws:

Exception

ph3_coord_dataIn

public static String ph3_coord_dataIn(String dataInName)

Used to specify a list of URI's that are used as input dir to the workflow job.

Look for two evaluator-level variables

A) .datain. B) .datain..unresolved

A defines the current list of URI.

B defines whether there are any unresolved EL-function (i.e latest)

If there are something unresolved, this function will echo back the original function

otherwise it sends the uris.

Parameters:

dataInName - : Datain name

Returns:

the list of URI's separated by INSTANCE_SEPARATOR

if there are unresolved EL function (i.e. latest) , echo back

the function without resolving the function.

ph3_coord_dataOut

public static String ph3_coord_dataOut(String dataOutName)

Used to specify a list of URI's that are output dir of the workflow job.

Look for one evaluator-level variable

dataout.

It defines the current list of URI.

otherwise it sends the uris.

Parameters:

dataOutName - : Dataout name

Returns:

the list of URI's separated by INSTANCE_SEPARATOR

ph2_coord_current

public static String ph2_coord_current(int n)
                                throws Exception

Determine the date-time in Oozie processing timezone of n-th dataset instance.

It depends on:

1. Data set frequency

2. Data set Time unit (day, month, minute)

3. Data set Time zone/DST

4. End Day/Month flag

5. Data set initial instance

6. Action Creation Time

Parameters:

n - instance count domain: n is integer

Returns:

date-time in Oozie processing timezone of the n-th instance returns 'null' means n-th instance is earlier than Initial-Instance of DS

Throws:

Exception

ph2_coord_hoursInDay

public static int ph2_coord_hoursInDay(int n)
                                throws Exception

Determine how many hours is on the date of n-th dataset instance.

It depends on:

1. Data set frequency

2. Data set Time unit (day, month, minute)

3. Data set Time zone/DST

4. End Day/Month flag

5. Data set initial instance

6. Action Creation Time

Parameters:

n - instance count

domain: n is integer

Returns:

number of hours on that day

returns -1 means n-th instance is earlier than Initial-Instance of DS

Throws:

Exception

ph3_coord_hoursInDay

public static int ph3_coord_hoursInDay(int n)
                                throws Exception

Throws:

Exception

ph2_coord_daysInMonth

public static int ph2_coord_daysInMonth(int n)
                                 throws Exception

Calculate number of days in one month for n-th dataset instance.

It depends on:

1. Data set frequency .

2. Data set Time unit (day, month, minute)

3. Data set Time zone/DST

4. End Day/Month flag

5. Data set initial instance

6. Action Creation Time

Parameters:

n - instance count. domain: n is integer

Returns:

number of days in that month

returns -1 means n-th instance is earlier than Initial-Instance of DS

Throws:

Exception

ph3_coord_daysInMonth

public static int ph3_coord_daysInMonth(int n)
                                 throws Exception

Throws:

Exception

ph3_coord_latest

public static String ph3_coord_latest(int n)
                               throws Exception

Determine the date-time in Oozie processing timezone of n-th latest available dataset instance.

It depends on:

1. Data set frequency

2. Data set Time unit (day, month, minute)

3. Data set Time zone/DST

4. End Day/Month flag

5. Data set initial instance

6. Action Creation Time

7. Existence of dataset's directory

Parameters:

n - :instance count

domain: n > 0, n is integer

Returns:

date-time in Oozie processing timezone of the n-th instance

returns 'null' means n-th instance is earlier than Initial-Instance of DS

Throws:

Exception

configureEvaluator

public static void configureEvaluator(ELEvaluator evaluator,
                                      SyncCoordDataset ds,
                                      SyncCoordAction coordAction)

Configure an evaluator with data set and application specific information.

Helper method of associating dataset and application object

Parameters:

evaluator - : to set variables

ds - : Data Set object

coordAction - : Application instance

evalAndWrap

public static String evalAndWrap(ELEvaluator eval,
                                 String expr)
                          throws Exception

Helper method to wrap around with "${..}".

Parameters:

eval - :EL evaluator

expr - : expression to evaluate

Returns:

Resolved expression or echo back the same expression

Throws:

Exception

ph1_coord_current_echo

public static String ph1_coord_current_echo(String n)

ph2_coord_current_echo

public static String ph2_coord_current_echo(String n)

ph1_coord_dateOffset_echo

public static String ph1_coord_dateOffset_echo(String n,
                                               String offset,
                                               String unit)

ph1_coord_formatTime_echo

public static String ph1_coord_formatTime_echo(String dateTime,
                                               String format)

ph1_coord_latest_echo

public static String ph1_coord_latest_echo(String n)

ph2_coord_latest_echo

public static String ph2_coord_latest_echo(String n)

ph1_coord_future_echo

public static String ph1_coord_future_echo(String n,
                                           String instance)

ph2_coord_future_echo

public static String ph2_coord_future_echo(String n,
                                           String instance)

ph1_coord_dataIn_echo

public static String ph1_coord_dataIn_echo(String n)

ph1_coord_dataOut_echo

public static String ph1_coord_dataOut_echo(String n)

ph1_coord_nominalTime_echo

public static String ph1_coord_nominalTime_echo()

ph1_coord_nominalTime_echo_wrap

public static String ph1_coord_nominalTime_echo_wrap()

ph1_coord_nominalTime_echo_fixed

public static String ph1_coord_nominalTime_echo_fixed()

ph1_coord_actualTime_echo_wrap

public static String ph1_coord_actualTime_echo_wrap()

ph1_coord_actionId_echo

public static String ph1_coord_actionId_echo()

ph1_coord_name_echo

public static String ph1_coord_name_echo()

coord_minutes_echo

public static String coord_minutes_echo(String n)

coord_hours_echo

public static String coord_hours_echo(String n)

coord_days_echo

public static String coord_days_echo(String n)

coord_endOfDay_echo

public static String coord_endOfDay_echo(String n)

coord_months_echo

public static String coord_months_echo(String n)

coord_endOfMonth_echo

public static String coord_endOfMonth_echo(String n)

coord_actualTime_echo

public static String coord_actualTime_echo()

ph1_coord_hoursInDay_echo

public static String ph1_coord_hoursInDay_echo(String n)

ph1_coord_daysInMonth_echo

public static String ph1_coord_daysInMonth_echo(String n)

ph1_coord_tzOffset_echo

public static String ph1_coord_tzOffset_echo()

coord_conf

public static String coord_conf(String property)

Return a job configuration property for the coordinator.

Parameters:

property - property name.

Returns:

the value of the property, null if the property is undefined.

coord_user

public static String coord_user()

Return the user that submitted the coordinator job.

Returns:

the user that submitted the coordinator job.