Difference between revisions of "Job Module"
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All functions in this module are assigned to the <code><nowiki>http://basex.org/modules/jobs</nowiki></code> namespace, which is statically bound to the {{Code|jobs}} prefix. Errors will be bound to the same prefix. | All functions in this module are assigned to the <code><nowiki>http://basex.org/modules/jobs</nowiki></code> namespace, which is statically bound to the {{Code|jobs}} prefix. Errors will be bound to the same prefix. | ||
− | =Functions= | + | =Services= |
+ | |||
+ | Jobs can additionally be registered as persistent services. An additional {{Code|service}} option has been added to the options list of {{Function|Jobs|jobs:eval}} and {{Function|Jobs|jobs:invoke}}: | ||
+ | |||
+ | <pre class="brush:xquery"> | ||
+ | (: register job, which will be run every day at 1 am :) | ||
+ | jobs:eval('db:drop("tmp")', (), map { 'id':'cleanup', 'start':'01:00:00', 'interval':'P1D', 'service': true() }), | ||
+ | |||
+ | (: list registered services :) | ||
+ | jobs:services(), | ||
+ | (: result: <job base-uri="..." id="cleanup" interval="P1D" start="01:00:00">db:drop("tmp")</job> :) | ||
+ | |||
+ | (: unregister job :) | ||
+ | jobs:stop('cleanup', map { 'service': true() }) | ||
+ | </pre> | ||
+ | |||
+ | '''Some more notes:''' | ||
+ | |||
+ | * All registered jobs will be scheduled for evaluation when the BaseX server or BaseX HTTP server is started. | ||
+ | * If a job service is outdated (e.g. because a supplied end time has been exceeded), it will be removed from the jobs file at startup time. | ||
+ | * Job services can be updated: If a new job is registered, and if there is already a job with the same id, the old entry will be replaced. | ||
+ | * The job definitions are stored in a {{Code|jobs.xml}} file in the database directory. It can also be edited manually. | ||
+ | |||
+ | =Basic Functions= | ||
==jobs:current== | ==jobs:current== | ||
Line 26: | Line 49: | ||
|- | |- | ||
| '''Summary''' | | '''Summary''' | ||
− | |Returns the ids of all jobs that are currently registered. The list includes scheduled, queued, running | + | |Returns the ids of all jobs that are currently registered. The list includes scheduled, queued, running, stopped, and finished jobs with cached results. |
|- | |- | ||
| '''Examples''' | | '''Examples''' | ||
− | | | + | | <code>jobs:list()</code> returns the same job id as {{Function|Jobs|jobs:current}} if no other job is registered. |
− | |||
− | |||
|} | |} | ||
==jobs:list-details== | ==jobs:list-details== | ||
+ | |||
+ | {{Mark|Updated with Version 9.1:}} registration time added | ||
{| width='100%' | {| width='100%' | ||
Line 42: | Line 65: | ||
|- | |- | ||
| '''Summary''' | | '''Summary''' | ||
− | |Returns information on all jobs that are currently registered. The list includes scheduled, queued, running jobs, and cached jobs. A string representation of the job will be returned | + | |Returns information on all jobs that are currently registered, or on a job with the specified {{Code|$id}} (or an empty sequence if this job is not found). The list includes scheduled, queued, running jobs, and cached jobs. A string representation of the job, or its URI, will be returned as value. The returned elements have additional attributes: |
* <code>id</code>: job id | * <code>id</code>: job id | ||
* <code>type</code>: type of the job (command, query, REST, RESTXQ, etc.) | * <code>type</code>: type of the job (command, query, REST, RESTXQ, etc.) | ||
− | * <code>state</code>: current state of the job | + | * <code>state</code>: current state of the job: <code>scheduled</code>, <code>queued</code>, <code>running</code>, <code>cached</code> |
− | * <code>user</code>: | + | * <code>user</code>: user who started the job |
− | * <code>duration</code>: evaluation time ( | + | * <code>duration</code>: evaluation time (included if a job is running or if the result was cached) |
− | * <code>start</code>: | + | * <code>start</code>: next start of job (included if a job will be executed repeatedly) |
+ | * <code>time</code>: time when job was registered | ||
|- | |- | ||
| '''Examples''' | | '''Examples''' | ||
− | | | + | | <code>jobs:list-details()</code> returns information on the currently running job and possibly others: |
− | |||
<pre class="brush:xml"> | <pre class="brush:xml"> | ||
<job id="job1" type="XQuery" state="running" user="admin" duration="PT0.001S"> | <job id="job1" type="XQuery" state="running" user="admin" duration="PT0.001S"> | ||
Line 73: | Line 96: | ||
|} | |} | ||
− | ==jobs: | + | ==jobs:services== |
{| width='100%' | {| width='100%' | ||
|- | |- | ||
| width='120' | '''Signatures''' | | width='120' | '''Signatures''' | ||
− | |{{Func|jobs: | + | |{{Func|jobs:services||element(job)*}} |
|- | |- | ||
| '''Summary''' | | '''Summary''' | ||
− | | | + | |Returns a list of all jobs that have been persistently registered as [[#Services|Services]]. |
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | | | ||
− | |||
− | |||
|- | |- | ||
| '''Errors''' | | '''Errors''' | ||
− | |{{Error| | + | |{{Error|services|#Errors}} Registered services cannot be parsed.<br/> |
|} | |} | ||
− | = | + | =Execution= |
Asynchronous query execution is recommendable if a client does not, or cannot, wait until a request is fully processed. This is e. g. the case with web browsers, which will usually cancel a request after a specific timeout. In such cases, you can use asynchronous execution to trigger another server-side process, which will start the time-consuming process, and fetch the result later on as soon as it is available. | Asynchronous query execution is recommendable if a client does not, or cannot, wait until a request is fully processed. This is e. g. the case with web browsers, which will usually cancel a request after a specific timeout. In such cases, you can use asynchronous execution to trigger another server-side process, which will start the time-consuming process, and fetch the result later on as soon as it is available. | ||
==jobs:eval== | ==jobs:eval== | ||
− | |||
− | |||
{| width='100%' | {| width='100%' | ||
|- | |- | ||
| width='120' | '''Signatures''' | | width='120' | '''Signatures''' | ||
− | |{{Func|jobs:eval|$query as xs:string|xs:string}}<br />{{Func|jobs:eval|$query as xs:string, $bindings as map(*)?|xs:string}}<br />{{Func|jobs:eval|$query as xs:string, $bindings as map(*)?, $options as map( | + | |{{Func|jobs:eval|$query as xs:string|xs:string}}<br />{{Func|jobs:eval|$query as xs:string, $bindings as map(*)?|xs:string}}<br />{{Func|jobs:eval|$query as xs:string, $bindings as map(*)?, $options as map(*)?|xs:string}}<br /> |
|- | |- | ||
| '''Summary''' | | '''Summary''' | ||
− | |Schedules the evaluation of the supplied {{Code|$query}} and returns a query id. The query will be queued, and the result will optionally be cached. Queries can be updating. Variables and context items can be declared via {{Code|$bindings}} (see [[XQuery Module#xquery:eval|xquery:eval]] for more details). The {{Code|$options}} | + | |Schedules the evaluation of the supplied {{Code|$query}} and returns a query id. The query will be queued, and the result will optionally be cached. Queries can be updating. Variables and context items can be declared via {{Code|$bindings}} (see [[XQuery Module#xquery:eval|xquery:eval]] for more details). The following {{Code|$options}} can be supplied: |
* {{Code|cache}}: indicates if the query result will be cached or ignored (default: <code>false</code>): | * {{Code|cache}}: indicates if the query result will be cached or ignored (default: <code>false</code>): | ||
** The result will be cached in main-memory until it is fetched via [[#jobs:result|jobs:result]], or until {{Option|CACHETIMEOUT}} is exceeded. | ** The result will be cached in main-memory until it is fetched via [[#jobs:result|jobs:result]], or until {{Option|CACHETIMEOUT}} is exceeded. | ||
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* {{Code|start}}: a dayTimeDuration, time or dateTime can be specified to delay the execution of the query: | * {{Code|start}}: a dayTimeDuration, time or dateTime can be specified to delay the execution of the query: | ||
** If a dayTimeDuration is specified, the query will be queued after the specified duration has passed. Examples for valid values are: <code>P1D</code> (1 day), <code>PT5M</code> (5 minutes), <code>PT0.1S</code> (100 ms). An error will be raised if a negative value is specified. | ** If a dayTimeDuration is specified, the query will be queued after the specified duration has passed. Examples for valid values are: <code>P1D</code> (1 day), <code>PT5M</code> (5 minutes), <code>PT0.1S</code> (100 ms). An error will be raised if a negative value is specified. | ||
− | ** If a time is specified, the query will be executed at this time of the day. Examples for valid times are: <code>02:00:00</code> (2am), <code>12:00: | + | ** If a time is specified, the query will be executed at this time of the day. Examples for valid times are: <code>02:00:00</code> (2am local time), <code>12:00:00Z</code> (noon, UTC). If the time lies in the past, the query will be executed the next day. |
** If a dateTime is specified, the query will be executed at this date. Examples for valid values are: <code>2018-12-31T23:59:59</code> (New Year's Eve 2018, close to midnight). An error will be raised if the specified time lies in the past. | ** If a dateTime is specified, the query will be executed at this date. Examples for valid values are: <code>2018-12-31T23:59:59</code> (New Year's Eve 2018, close to midnight). An error will be raised if the specified time lies in the past. | ||
* {{Code|interval}}: a dayTimeDuration string can be specified to execute the query periodically. An error is raised if the specified interval is less than one second (<code>PT1S</code>). If the next scheduled call is due, and if a query with the same id is still running, it will be skipped. | * {{Code|interval}}: a dayTimeDuration string can be specified to execute the query periodically. An error is raised if the specified interval is less than one second (<code>PT1S</code>). If the next scheduled call is due, and if a query with the same id is still running, it will be skipped. | ||
Line 124: | Line 134: | ||
* {{Code|base-uri}}: sets the [https://www.w3.org/TR/xquery-31/#dt-static-base-uri base-uri property] for the query. This URI will be used when resolving relative URIs, such as with {{Code|fn:doc}}. | * {{Code|base-uri}}: sets the [https://www.w3.org/TR/xquery-31/#dt-static-base-uri base-uri property] for the query. This URI will be used when resolving relative URIs, such as with {{Code|fn:doc}}. | ||
* {{Code|id}}: sets a custom job id. The id must not start with the standard <code>job</code> prefix, and it can only be assigned if no job with the same name exists. | * {{Code|id}}: sets a custom job id. The id must not start with the standard <code>job</code> prefix, and it can only be assigned if no job with the same name exists. | ||
+ | * {{Code|service}}: additionally registers the job as [[#Services|service]]. | ||
|- | |- | ||
| '''Errors''' | | '''Errors''' | ||
− | |{{Error|overflow|#Errors}} Query execution is rejected, because too many jobs are queued or being executed. {{Option|CACHETIMEOUT}} can be decreased if the default setting is too restrictive.<br/>{{Error|range|#Errors}} A specified time or duration is out of range.<br/>{{Error|id|#Errors}} The specified id is invalid or has already been assigned. | + | |{{Error|overflow|#Errors}} Query execution is rejected, because too many jobs are queued or being executed. {{Option|CACHETIMEOUT}} can be decreased if the default setting is too restrictive.<br/>{{Error|range|#Errors}} A specified time or duration is out of range.<br/>{{Error|id|#Errors}} The specified id is invalid or has already been assigned.<br/>{{Error|options|#Errors}} The specified options are conflicting. |
|- | |- | ||
| '''Examples''' | | '''Examples''' | ||
Line 151: | Line 162: | ||
<pre class="brush:xquery"> | <pre class="brush:xquery"> | ||
jobs:eval("prof:sleep(1500)", (), map { 'interval': 'PT1S', 'end': 'PT10S' }) | jobs:eval("prof:sleep(1500)", (), map { 'interval': 'PT1S', 'end': 'PT10S' }) | ||
+ | </pre> | ||
+ | * The following expression, if stored as a file, calls and evaluates itself every 5 seconds: | ||
+ | <pre class="brush:xquery"> | ||
+ | jobs:eval( | ||
+ | file:read-text(static-base-uri()), | ||
+ | map { }, | ||
+ | map { 'start': 'PT5S' } | ||
+ | ) | ||
+ | </pre> | ||
+ | |} | ||
+ | |||
+ | ==jobs:invoke== | ||
+ | |||
+ | {| width='100%' | ||
+ | |- | ||
+ | | width='120' | '''Signatures''' | ||
+ | |{{Func|jobs:invoke|$uri as xs:string|xs:string}}<br />{{Func|jobs:invoke|$uri as xs:string, $bindings as map(*)?|xs:string}}<br />{{Func|jobs:invoke|$uri as xs:string, $bindings as map(*)?, $options as map(*)?|xs:string}}<br /> | ||
+ | |- | ||
+ | | '''Summary''' | ||
+ | |Schedules the evaluation of the XQuery expression located at {{Code|$uri}} and returns a query id. For further details, see [[#jobs:eval|jobs:eval]]. | ||
+ | |- | ||
+ | | '''Errors''' | ||
+ | |{{Error|overflow|#Errors}} Query execution is rejected, because too many jobs are queued or being executed. {{Option|CACHETIMEOUT}} can be decreased if the default setting is too restrictive.<br/>{{Error|range|#Errors}} A specified time or duration is out of range.<br/>{{Error|id|#Errors}} The specified id is invalid or has already been assigned.<br/>{{Error|options|#Errors}} The specified options are conflicting. | ||
+ | |- | ||
+ | | '''Examples''' | ||
+ | | Run XQuery expression that may perform some cleanups: | ||
+ | <pre class='brush:xquery'> | ||
+ | jobs:invoke("cleanup.xq", (), ()) | ||
</pre> | </pre> | ||
|} | |} | ||
Line 184: | Line 223: | ||
jobs:result($query) | jobs:result($query) | ||
) | ) | ||
− | |||
</pre> | </pre> | ||
+ | Please note that queries of this kind can cause deadlocks. For example, if both the original query and the query to be executed asynchronously perform updates on the same database, the second query would only be run after the first one has been executed, and the first query will wait forever. This is why you should avoid this pattern in practice and resort to [[XQuery Module#xquery:fork-join|xquery:fork-join]] if you want to do things in parallel. | ||
+ | |} | ||
+ | |||
+ | ==jobs:stop== | ||
+ | |||
+ | {| width='100%' | ||
+ | |- | ||
+ | | width='120' | '''Signatures''' | ||
+ | |{{Func|jobs:stop|$id as xs:string|empty-sequence()}} | ||
+ | |- | ||
+ | | '''Summary''' | ||
+ | |Triggers the cancelation of a job with the specified {{Code|$id}}, drops the cached result of a query, or cancels a scheduled job. Unknown ids are ignored. All jobs are gracefully stopped; it is up to the process to decide when it is safe to shut down. The following {{Code|$options}} can be supplied: | ||
+ | * {{Code|service}}: additionally removes the job from the [[#Services|job services]] list. | ||
+ | |- | ||
+ | | '''Examples''' | ||
+ | | <code>jobs:list()[. != jobs:current()] ! jobs:stop(.)</code> stops and discards all jobs except for the current one. | ||
+ | |} | ||
+ | |||
+ | ==jobs:wait== | ||
+ | |||
+ | {| width='100%' | ||
+ | |- | ||
+ | | width='120' | '''Signatures''' | ||
+ | |{{Func|jobs:wait|$id as xs:string|empty-sequence()}} | ||
+ | |- | ||
+ | | '''Summary''' | ||
+ | |Waits for the completion of a job with the specified {{Code|$id}}: | ||
+ | * The function will terminate immediately if the job id is unknown. This is the case if a future job has not been queued yet, or if the id has already been discarded after job evaluation. | ||
+ | * If the function is called with the id of a queued job, or repeatedly executed job, it may stall and never terminate. | ||
+ | |- | ||
+ | | '''Errors''' | ||
+ | |{{Error|self|#Errors}} The current job is addressed.<br/> | ||
|} | |} | ||
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|Description | |Description | ||
|- | |- | ||
− | |{{Code| | + | |{{Code|options}} |
− | | The | + | | The specified options are conflicting. |
|- | |- | ||
− | |{{Code| | + | |{{Code|id}} |
− | | | + | | The specified id is invalid or has already been assigned. |
|- | |- | ||
|{{Code|overflow}} | |{{Code|overflow}} | ||
Line 206: | Line 276: | ||
| A specified time or duration is out of range. | | A specified time or duration is out of range. | ||
|- | |- | ||
− | |{{Code| | + | |{{Code|running}} |
− | | | + | | A query is still running. |
|- | |- | ||
|{{Code|self}} | |{{Code|self}} | ||
| The current job cannot be addressed. | | The current job cannot be addressed. | ||
+ | |- | ||
+ | |{{Code|service}} | ||
+ | | Registered services cannot be parsed, added or removed. | ||
+ | |- | ||
+ | |{{Code|unknown}} | ||
+ | | The supplied query id is unknown or not available anymore. | ||
|} | |} | ||
=Changelog= | =Changelog= | ||
+ | |||
+ | ;Version 9.1 | ||
+ | |||
+ | * Updated: {{Function|Jobs|jobs:list-details}}: registration time added. | ||
+ | |||
+ | ;Version 9.0 | ||
+ | |||
+ | * Added: {{Function|Jobs|jobs:invoke}}, [[#Services|Services]] | ||
;Version 8.6 | ;Version 8.6 |
Revision as of 18:11, 31 October 2018
This XQuery Module provides functions for organizing scheduled, queued, running and cached jobs. Jobs can be commands, queries, client or HTTP requests.
Contents
Conventions
All functions in this module are assigned to the http://basex.org/modules/jobs
namespace, which is statically bound to the jobs
prefix. Errors will be bound to the same prefix.
Services
Jobs can additionally be registered as persistent services. An additional service
option has been added to the options list of jobs:eval
and jobs:invoke
:
(: register job, which will be run every day at 1 am :) jobs:eval('db:drop("tmp")', (), map { 'id':'cleanup', 'start':'01:00:00', 'interval':'P1D', 'service': true() }), (: list registered services :) jobs:services(), (: result: <job base-uri="..." id="cleanup" interval="P1D" start="01:00:00">db:drop("tmp")</job> :) (: unregister job :) jobs:stop('cleanup', map { 'service': true() })
Some more notes:
- All registered jobs will be scheduled for evaluation when the BaseX server or BaseX HTTP server is started.
- If a job service is outdated (e.g. because a supplied end time has been exceeded), it will be removed from the jobs file at startup time.
- Job services can be updated: If a new job is registered, and if there is already a job with the same id, the old entry will be replaced.
- The job definitions are stored in a
jobs.xml
file in the database directory. It can also be edited manually.
Basic Functions
jobs:current
Signatures | jobs:current() as xs:string
|
Summary | Returns the id of the current job. |
jobs:list
Signatures | jobs:list() as xs:string*
|
Summary | Returns the ids of all jobs that are currently registered. The list includes scheduled, queued, running, stopped, and finished jobs with cached results. |
Examples | jobs:list() returns the same job id as jobs:current if no other job is registered.
|
jobs:list-details
Template:Mark registration time added
Signatures | jobs:list-details() as element(job)* jobs:list-details($id as xs:string) as element(job)*
|
Summary | Returns information on all jobs that are currently registered, or on a job with the specified $id (or an empty sequence if this job is not found). The list includes scheduled, queued, running jobs, and cached jobs. A string representation of the job, or its URI, will be returned as value. The returned elements have additional attributes:
|
Examples | jobs:list-details() returns information on the currently running job and possibly others:
<job id="job1" type="XQuery" state="running" user="admin" duration="PT0.001S"> XQUERY jobs:list-details() </job> |
jobs:finished
Signatures | jobs:finished($id as xs:string) as xs:boolean
|
Summary | Indicates if the evaluation of an already running job with the specified $id has finished. As the ids of finished jobs will usually be discarded, unless caching is enabled, the function will also return true for unknown jobs.
|
jobs:services
Signatures | jobs:services() as element(job)*
|
Summary | Returns a list of all jobs that have been persistently registered as Services. |
Errors | services : Registered services cannot be parsed. |
Execution
Asynchronous query execution is recommendable if a client does not, or cannot, wait until a request is fully processed. This is e. g. the case with web browsers, which will usually cancel a request after a specific timeout. In such cases, you can use asynchronous execution to trigger another server-side process, which will start the time-consuming process, and fetch the result later on as soon as it is available.
jobs:eval
Signatures | jobs:eval($query as xs:string) as xs:string jobs:eval($query as xs:string, $bindings as map(*)?) as xs:string jobs:eval($query as xs:string, $bindings as map(*)?, $options as map(*)?) as xs:string |
Summary | Schedules the evaluation of the supplied $query and returns a query id. The query will be queued, and the result will optionally be cached. Queries can be updating. Variables and context items can be declared via $bindings (see xquery:eval for more details). The following $options can be supplied:
|
Errors | overflow : Query execution is rejected, because too many jobs are queued or being executed. CACHETIMEOUT can be decreased if the default setting is too restrictive.range : A specified time or duration is out of range.id : The specified id is invalid or has already been assigned.options : The specified options are conflicting.
|
Examples |
jobs:eval("1+3", (), map { 'cache': true() })
jobs:eval("import module namespace mail='mail'; mail:send('Happy birthday!')", (), map { 'start': '2018-09-01T06:00:00' })}}
declare %rest:POST("{$query}") %rest:path('/start-scheduling') function local:start($query) { jobs:eval($query, (), map { 'start': '02:00:00', 'interval': 'P1D' }) }; declare %rest:path('/stop-scheduling/{$id}') function local:stop($id) { jobs:stop($id) };
jobs:eval("prof:sleep(1500)", (), map { 'interval': 'PT1S', 'end': 'PT10S' })
jobs:eval( file:read-text(static-base-uri()), map { }, map { 'start': 'PT5S' } ) |
jobs:invoke
Signatures | jobs:invoke($uri as xs:string) as xs:string jobs:invoke($uri as xs:string, $bindings as map(*)?) as xs:string jobs:invoke($uri as xs:string, $bindings as map(*)?, $options as map(*)?) as xs:string |
Summary | Schedules the evaluation of the XQuery expression located at $uri and returns a query id. For further details, see jobs:eval.
|
Errors | overflow : Query execution is rejected, because too many jobs are queued or being executed. CACHETIMEOUT can be decreased if the default setting is too restrictive.range : A specified time or duration is out of range.id : The specified id is invalid or has already been assigned.options : The specified options are conflicting.
|
Examples | Run XQuery expression that may perform some cleanups:
jobs:invoke("cleanup.xq", (), ()) |
jobs:result
Signatures | jobs:result($id as xs:string) as item()*
|
Summary | Returns the cached result of a job with the specified job $id :
|
Errors | running : the job is still running.unknown : the supplied id is unknown: The id is unknown, or the result has already been retrieved. |
Examples |
declare %rest:path('/result/{$id}') function local:result($id) { jobs:result($id) };
let $query := jobs:eval('(1 to 10000000)[. = 1]', map{}, map{ 'cache': true() }) return ( jobs:wait($query), jobs:result($query) ) Please note that queries of this kind can cause deadlocks. For example, if both the original query and the query to be executed asynchronously perform updates on the same database, the second query would only be run after the first one has been executed, and the first query will wait forever. This is why you should avoid this pattern in practice and resort to xquery:fork-join if you want to do things in parallel. |
jobs:stop
Signatures | jobs:stop($id as xs:string) as empty-sequence()
|
Summary | Triggers the cancelation of a job with the specified $id , drops the cached result of a query, or cancels a scheduled job. Unknown ids are ignored. All jobs are gracefully stopped; it is up to the process to decide when it is safe to shut down. The following $options can be supplied:
|
Examples | jobs:list()[. != jobs:current()] ! jobs:stop(.) stops and discards all jobs except for the current one.
|
jobs:wait
Signatures | jobs:wait($id as xs:string) as empty-sequence()
|
Summary | Waits for the completion of a job with the specified $id :
|
Errors | self : The current job is addressed. |
Errors
Code | Description |
---|---|
options
|
The specified options are conflicting. |
id
|
The specified id is invalid or has already been assigned. |
overflow
|
Too many queries or query results are queued. |
range
|
A specified time or duration is out of range. |
running
|
A query is still running. |
self
|
The current job cannot be addressed. |
service
|
Registered services cannot be parsed, added or removed. |
unknown
|
The supplied query id is unknown or not available anymore. |
Changelog
- Version 9.1
- Updated:
jobs:list-details
: registration time added.
- Version 9.0
- Added:
jobs:invoke
, Services
- Version 8.6
- Updated: jobs:eval:
id
option added.
The module was introduced with Version 8.5.