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Description of the JobSchedulerExistsFile Job - check whether a file exists

Checks for the existence of a file, a directory or for specific files inside of a directory. 

The polling in above graphic is provided by a file order source setting in the job chain.

Example Job to Create a Result Set.

This job is creating a result set. A  A result set contain the names of all files which are selected as specified by the filter criteria. The content of the result set is returned as a parameter, but can be written to a file, too.
Parameters, which are useful for creating a result-set, are:

An example for a job-xml file:

  <job order='no' >
     <params>
       <param name="[[#file|file]]" value="." />
       <param name="[[#file_spec|file_spec]]" value="" />
       <param name="[[#gracious|gracious]]" value="false" />
       <param name="[[#max_file_age|max_file_age]]" value="0" />
       <param name="[[#min_file_age|min_file_age]]" value="0" />
       <param name="[[#max_file_size|max_file_size]]" value="-1" />
       <param name="[[#min_file_size|min_file_size]]" value="-1" />
       <param name="[[#skip_first_files|skip_first_files]]" value="0" />
       <param name="[[#skip_last_files|skip_last_files]]" value="0" />
       <param name="[[#count_files|count_files]]" value="false" />
       <param name="[[#create_order|create_order]]" value="false" />
       <param name="[[#create_orders_for_all_files|create_orders_for_all_files]]file" value="false" />
       <param name="[[#order_jobchain_name|order_jobchain_name]]" value="" />
       <param name="[[#next_state|nextnext_state]]" value="" />
       <param name="[[#on_empty_result_set|on_empty_result_set]]" value="empty" />
       <param name="[[#expected_size_of_result_set|expected_size_of_result_set]]" value="0" />
       <param name="[[#raise_error_if_result_set_is|raise_error_if_result_set_is]]" value="0" />
       <param name="[[#result_list_file|result_list_file]]" value="empty" />
     </params>
     <script language="java" java_class="sos.scheduler.file.JobSchedulerExistsFile" />
  </job>
 

This job can be used standalone, as a single job, or as an order driven job in a jobchain as a jobchain node. Parameters are respectively accepted as job- or as order-parameters.
A job can process multiple parameters that are analysed analyzed when the job starts. Parameters are defined in the configuration of the job or of the order. Parameters can also be submitted by API methods, as well. Parameters are optional or mandatory and may contain default values.
This job is creating a result set. A result set contain the names of all files which are selected as specified by the filter criteria. The content of the result set is returned as a parameter, but can be written to a file, too. Parameters, which are useful for creating a result-set, are

This job can create file-orders. It can be specified that a file-order is created for the first file of the result set only or for all files of the result set.

Parameter used by JobSchedulerExistsFile

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Parameter Definitions

Parameters Used by JobSchedulerExistsFile

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file file

Parameter file: File or Folder to watch for

...

File or Folder to watch for
Checked file or directory
Supports masks for substitution in the file name and directory name with format strings that are enclosed by {*} and {*} [and] . The following format strings are supported:

 [date: date format ]  
 
 '''date format''' must be a valid Java data format string, e.g. '''yyyyMMddHHmmss''' , '''yyyy-MM-dd.HHmmss''' etc. 
 

An example:

 <param name="file" value="sample/hello[date:yyyyMMdd].txt" />  
 

On 2050-12-31 the parameter file contains the value "sample/hello20501231.txt" .
This parameter supports substitution of job parameter names with their value if the job parameter name is enclosed by %  and  % .
An example: <param name="file" valuh1. value"%scheduler_file_path%" />
During the job runtime the parameter file contains the value of the job parameter scheduler_file_path . Using Directory Monitoring with File Orders the job parameter scheduler_file_path contains automatically the path of the file that triggered the order.
Data-Type : SOSOptionString
The default value for this parameter is ..
This parameter is mandatory.

...

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file_spec file_spec

Parameter file_spec

...

: Regular Expression for filename filtering

...

Regular Expression for filename filtering
Regular Expression for file filtering. The behaviour is CASE_INSENSITIVE.
Only effective if the parameter file is a directory.
Some remarks on regular expression, as used in JobScheduler. :

• A regular expression is not a wildcard . To get an impression of the differences one have a look on the meaning of the wildcard .txt, which will select all filenames with the filename-extension ".txt". A regular expression to match, e.g. works the same way, this "wildcard" must look like "^.\.txt$". That looks a little bit strange but it is much more flexible and powerfull on filtering filenames than the concept of wildcards, if one want to filter more complex names or pattern.
• The general syntax of an regular expression , also referred to as regex or regexp, is described here . It is different to other RegExp definitions, e.g. as for Perl.

Data-Type : SOSOptionRegExp

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gracious gracious

Parameter

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gracious

...

: Specify error message tolerance

...

Specify error message tolerance
Enables or disables error messages that are caused by an empty result-set, which is the result of an operation, executed by the job. Therefore this parameter can control the sequence of nodes or states in a job-chain.
Valid values:

 '''false, 0, off, no, n, nein, none''' , '''true, 1, on, yes, y, ja, j''' and '''all''' . 
 

The following rules apply when the result - set is empty:

For example, the setting "graciousallgracious=all" will suppress all errors regarding an empty result-set and will terminate a Job (standalone and inside a jobchain) as it would be without errors.
Data-Type : SOSOptionGracious
The default value for this parameter is false.

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max_file_age max_file_age

...

Parameter max_file_

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age:

...

Maximum age of a file

...

maximum age of a file
Specifies the maximum age of a file. If a file is older, then it is deemed not to exist, it will be not included in the result - list.
Data-Type : SOSOptionTime
The default value for this parameter is 0.

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min_file_age min_file_age

...

Parameter min_file_

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age:

...

Minimum age of a file

...

_minimum age of a file

_Specifies the minimum age of a files. If the file(s) is newer then it is classified as non-existing, it will be not included in the result - list.
Data-Type : SOSOptionTime
The default value for this parameter is 0.

...

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max_file_size max_file_size

...

Parameter max_file_

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size:

...

Maximum size of a file

...

_maximum size of a file

_Specifies the maximum size of a file in bytes: should the size of one of the files exceed this value, then it is classified as non-existing.
valid values for file size are

...

Data-Type : SOSOptionFileSize
The default value for this parameter is -1.

...

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min_file_size min_file_size

...

Parameter min_file_

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size:

...

Minimum size of one or multiple files

...

minimum size of one or multiple files
Specifies the minimum size of one or multiple files in bytes: should the size of one of the files fall below this value, then it is not included in the result list of the operation.
valid values for file size are

...

Data-Type : SOSOptionFileSize
The default value for this parameter is -1.

...

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skip_first_files

...

skip_first_files

Parameter skip_first_

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files:

...

Number of files to remove from the top of the result-set

...

number of files to remove from the top of the result-set
The number of files are removed from the beginning of the set resulting by min_file_size , min_file_age etc. These files are excluded from further operations.
The result set is sorted according to the used filter parameters:

...

Only either skip_first_files or skip_last_files is allowed to be set at the same time.
Data-Type : SOSOptionInteger
The default value for this parameter is 0.

...

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skip_last_files skip_last_files

...

Parameter skip_last_

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files:

...

Number of files to remove from the bottom of the result-set

...

_number Number of files to remove from the bottom of the result-set

_The number of files are removed from the end of the set resulting by min_file_size, min_file_age etc. These files are excluded from further operations.

The result set is sorted according to the used constraining parameters used: +

• min_file_age, max_file_age: in ascending order by date of last modification, the newest file first.

...

• min_file_size, max_file_size: in ascending order by file size, the smallest file first.

+ if If parameters for file age as well as file size are given the set is sorted by file age.

Only either skip_first_files or skip_last_files is allowed to be set at one time.
Data-Type : SOSOptionInteger
The default value for this parameter is 0.

...

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count_files count_files

Parameter count_files

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: Return the size of resultset

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Return the size of resultset
If this parameter is set true " true " the number of matches is returned in the order parameter " scheduler_SOSFileOperations_file_count ".
Valid values: true, 1, on, yes, y, ja, j and false, 0, off, no, n, nein
This parameter is valid and available for order driven jobs only. JobChains, for example, are order driven jobs. In standalone jobs this parameter will be ignored without further notice.
Data-Type : SOSOptionBoolean
The default value for this parameter is false.

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create_order

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create_order

Parameter create_order: Activate file-order creation

...

Activate file-order creation
With this parameter it is possible to specify, that for all filenames in the resultlist or for the first file only (see create_orders_for_all_files ) a file-order has to be created and launched.
Valid values: true, 1, on, yes, y, ja, j and false, 0, off, no, n, nein
Data-Type : SOSOptionBoolean
The default value for this parameter is false.
Use together with parameter:
create_orders_for_all_files - Create a file-order for every file in the result-listorder_jobchain_name - next_state -

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create_orders_for_all_files create_orders_for_all_files

...

Parameter create_orders_for_all_

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files: Create a file-order for every file in the result-list

...

Create a file-order for every file in the result-list
Valid values: true, 1, on, yes, y, ja, j and false, 0, off, no, n, nein
Data-Type : SOSOptionBoolean
The default value for this parameter is false.
Use together with parameter:
create_order - Activate file-order creationorder_jobchain_name - next_state -

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create_orders_for_new_files

Parameter <span id"order_jobchain_name">order_jobchain_name<span>: The name of the jobchain which belongs to the order

The name of the jobchain which belongs to the order
The name of the jobchain which has to be launched by the order is the value of this parameter.
One must take into account, that the name of the jobchain must contain a subfolder structure if the jobchain is not in the folder "live". An example: the jobchain "Test" is located in "live/sample/FileOperations/". The value which has to be specfied is then "/sample/FileOperations/Test".
Data-Type : SOSOptionString
Use together with parameter:
create_order - Activate file-order creationnext_state -

Parameter <span ih1. "next_state">next_state<span>: The first node to execute in a jobchain

The first node to execute in a jobchain
The name of the node of a jobchain, with which the execution of the chain must be started, is the value of this parameter.
Data-Type : SOSOptionJobChainNode
Use together with parameter:
create_order - Activate file-order creationorder_jobchain_name -

Parameter <span id"on_empty_result_set">on_empty_result_set<span>: Set next node on empty result set

Set next node on empty result set
The next Node (Step, Job) to execute in a JobChain can be set with this parameter. The value of the parameter is a (valid) node-name of the current JobChain. In case of an empty result-set, e.g. due to non existent files, the current job will end without an errors and the JobChain will continue with the name of the node which is given as the value of this parameter.
Data-Type : SOSOptionJobChainNode
The default value for this parameter is empty.

Parameter <span ih1. "expected_size_of_result_set">expected_size_of_result_set<span>: number of expected hits in result-list

number of expected hits in result-list

Data-Type : SOSOptionInteger
The default value for this parameter is 0.
Use together with parameter:
raise_error_if_result_set_is - raise error on expected size of result-set

Parameter <span id"raise_error_if_result_set_is">raise_error_if_result_set_is<span>: raise error on expected size of result-set

raise error on expected size of result-set
With this parameter it is possible to raise an error if the quantity of hits of the result-list is according to the value of this parameter.
An example:
Assuming, that the parameter "raise_error_if_result_set_ih1. ne" is defined and the parameter "expected_size_of_result_set1" is specified as well. If the number of hits is not equal to "1" an error will raised.

Data-Type : SOSOptionRelOp
The default value for this parameter is 0.
Use together with parameter:
expected_size_of_result_set - number of expected hits in result-list

Parameter <span ih1. "result_list_file">result_list_file<span>: Name of the result-list file

Name of the result-list file
If the value of this parameter specifies a valid filename the result-list will be written to this file.
Data-Type : SOSOptionFileName
The default value for this parameter is empty.

Return parameter JobSchedulerExistsFile

create_orders_for_new_files

Parameter create_orders_for_new_files: Create a file-order for every new file in the result-list

...

Create a file-order for every new file in the result-list

If this parameter is set to "true", for each new file which is in the result set, a file-order is created and started.

This parameter is in effect only if the create_orders parameter is not set or has the value "true".

example 1: create a file-order

    create_orders_for_new_files=true

Valid values: true, 1, on, yes, y, ja, j and false, 0, off, no, n, nein.

DataType: SOSOptionBoolean

Default: false

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param_name_file_path param_name_file_path

Parameter param_name_file_path: The name of the parameter containing the name of the file to be transferred

...

The name of the parameter containing the name of the file to be transferred

This parameter sets the name of the parameter that contains the name of the transferred file. The default value is scheduler_file_path. The name should be changed from the default if it is not desired to create file_orders that have to handle a file sink.

DataType: SOSOptionString

Default: ---

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order_jobchain_name order_jobchain_name

Parameter order_jobchain_name: The name of the jobchain which belongs to the order

...

The name of the jobchain which belongs to the order
The name of the job chain which has to be launched by the order is the value of this parameter.
One must take into account, that the name of the jobchain must contain a subfolder structure if the jobchain is not in the folder "live". An example: the jobchain "Test" is located in "live/sample/FileOperations/". The value which has to be specfied is then "/sample/FileOperations/Test".
Data-Type : SOSOptionString
Use together with parameters:

• create_order - Activate file-order creation
• next_state -

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next_state next_state

Parameter next_state: The first node to execute in a jobchain

...

The first node to execute in a jobchain
The name of the node of a jobchain, with which the execution of the chain must be started, is the value of this parameter.
Data-Type : SOSOptionJobChainNode
Use together with parameters:

• create_order - Activate file-order creation
• order_jobchain_name -

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merge_order_parameter merge_order_parameter

Parameter merge_order_parameter: Merge actual order parameter into new created order  

...

merge actual order parameter into new created order  
 

This parameter specifies that the order, which has to be created, will be extended by the parameters of the actual order.

DataType: SOSOptionBoolean
Default: false 

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on_empty_result_set on_empty_result_set

Parameter on_empty_result_set: Set next node on empty result set

...

Set next node on empty result set
The next Node (Step, Job) to execute in a JobChain can be set with this parameter. The value of the parameter is a (valid) node-name of the current JobChain. In case of an empty result-set, e.g. due to non existent files, the current job will end without an errors and the JobChain will continue with the name of the node which is given as the value of this parameter.
Data-Type : SOSOptionJobChainNode
The default value for this parameter is empty.

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expected_size_of_result_set expected_size_of_result_set

Parameter expected_size_of_result_set: Number of expected hits in result list

...

Number of expected hits in result-list

Data-Type : SOSOptionInteger
The default value for this parameter is 0.
Use together with parameter:

• raise_error_if_result_set_is - raise error on expected size of result-set

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raise_error_if_result_set_is raise_error_if_result_set_is

Parameter raise_error_if_result_set_is: Raise error on expected size of result set

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Raise error on expected size of result-set
With this parameter it is possible to raise an error if the quantity of hits of the result list is according to the value of this parameter.
An example:
Assuming, that the parameter "raise_error_if_result_set_is=ne" is defined and the parameter "expected_size_of_result_set=1" is specified as well. If the number of hits is not equal to "1" an error will raised.

Data-Type : SOSOptionRelOp
The default value for this parameter is 0.
Use together with parameter:

• expected_size_of_result_set - number of expected hits in result-list

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result_list_file result_list_file

Parameter result_list_file: Name of the result list file

...

Name of the result-list file
If the value of this parameter specifies a valid filename the result-list will be written to this file.
Data-Type : SOSOptionFileName
The default value for this parameter is empty.

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check_steady_state_of_files check_steady_state_of_files

Parameter check_steady_state_of_files: Check the completeness of a file (steady state)

...

Check the completeness of a file (steady state) 

In some file transfer scenarios the receiver of a file has no knowledge about the time when the sender creates the file. In case of a (very) large file it can be the situation that the receiver tries to read the file but the sender has not finished writing it. If the receiver get the file at the moment the sender is still writing, as a result he will get a corrupted, incomplete file.

Setting this parameter to "true" the receiver will check the file for completeness before he starts the transfer.

At the end, this is not a very secure approach, because the receiver is checking the date of last modification and the size of the file. If both not changing between a time intervall, which is defined by the parameters ..., the file is guessed to be complete. If the sender is terminated without writing the complete file, or the network is down, or the speed of processing the file is going slow, the receiver will get a corrupted file.

A better approach for avoiding corrupt files is to use the atomic method: writing a file and after completion of writing rename the file. For more details about this method see parameter atomic_suffix or atomic_prefix.

If more than one file is to be transferred, the transactional approach is the first choice. See parameter transactional.

DataType: SOSOptionBoolean

Default: false

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steady_state_count steady_state_count

Parameter steady_state_count: Maximum Number of Checkpoints

...

Maximum Number of Checkpoints 

The value of this option specifies the number of retries for to check the steady state of a file.

DataType: SOSOptionInteger

Default: 30

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check_steady_state_interval check_steady_state_interval

Parameter check_steady_state_interval: Temporal distance between checkpoints

...

Temporal distance between checkpoints 

The value of this option defines the temporal distance in seconds between two checkpoints.

DataType: SOSOptionTime

Alias: Steady_State_Interval

Default: 1

Return Parameters from JobSchedulerExistsFile

The order parameters The order parameter described below are returned by the job to the JobScheduler. JobSchedulerExistsFile

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...

...

...

...

...

...

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scheduler_sosfileoperations_file_count

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Return the size of the result set after a file operation

...

false

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0

...

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scheduler_file_path scheduler_file_path

...

Parameter scheduler_file_

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path:

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File to process for a file-order

...

file to process for a file-order
Using Directory Monitoring with File Orders the job parameter scheduler_file_path contains automatically the path of the file that triggered the order.
Data-Type : SOSOptionFileName
The default value for this parameter is empty.

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scheduler_file_parent

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pathanme of the file to process for a file-order

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scheduler_file_

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parent

Parameter scheduler_file_

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parent:

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Pathname of the file to process for a file-order

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Name Pathname of the file to process for a file-order

Data-Type : SOSOptionFileName
The default value for this parameter is empty.

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scheduler_file_name scheduler_

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file_name

Parameter scheduler_file_name: Name of the file to process for a file-order

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Name of the file to process for a file-orderThe result of the operation as a list of items

Data-Type : SOSOptionstringSOSOptionFileName
The default value for this parameter is empty. Use together with parameter:

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scheduler_sosfileoperations_

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resultset scheduler_sosfileoperations_

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resultset

Parameter

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scheduler_sosfileoperations_

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resultset: The

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result

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of the operation as a list of items

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The amount of hits in the result set of the operation as a list of items

Data-Type : SOSOptionsIntegerSOSOptionstring
The default value for this parameter is empty.
Use together with parameter:

• scheduler_sosfileoperations_

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• Resultsetsize
• scheduler_sosfileoperations_file_count

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scheduler_sosfileoperations_

...

resultsetsize scheduler_sosfileoperations_

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resultsetsize

Parameter scheduler_sosfileoperations_resultsetsize: The amount of hits in the result set of the operation

...

The amount of hits in the result set of the Return the size of the result set after a file operation

Data-Type : SOSOptionIntegerSOSOptionsInteger
The default value for this parameter is 0 empty.
Use together with parameter:

• scheduler_sosfileoperations_ResultSet
• scheduler_sosfileoperations_

...

• FileCount

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scheduler_sosfileoperations_file_

...

count scheduler_sosfileoperations_file_count

...

Parameter scheduler_sosfileoperations_file_

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count: Return the size of the result set after a file operation

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Return the size of the result set after a file operation

Data-Type : SOSOptionInteger
The default value for this parameter is 0.
Use together with parameter:

• scheduler_sosfileoperations_Resultsetsize

...

• scheduler_sosfileoperations_ResultSet

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