[[java-rest-high-x-pack-ml-get-calendars]]
=== Get Calendars API
Retrieves one or more calendar objects.
It accepts a `GetCalendarsRequest` and responds
with a `GetCalendarsResponse` object.

[[java-rest-high-x-pack-ml-get-calendars-request]]
==== Get Calendars Request

By default a `GetCalendarsRequest` with no calendar Id set will return all
calendars. Using the literal `_all` also returns all calendars.

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/MlClientDocumentationIT.java[x-pack-ml-get-calendars-request]
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<1> Constructing a new request for all calendars


==== Optional Arguments
The following arguments are optional:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/MlClientDocumentationIT.java[x-pack-ml-get-calendars-id]
--------------------------------------------------
<1> Construct a request for the single calendar `holidays`


["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/MlClientDocumentationIT.java[x-pack-ml-get-calendars-page]
--------------------------------------------------
<1> The page parameters `from` and `size`. `from` specifies the number of calendars to skip.
`size` specifies the maximum number of calendars to get. Defaults to `0` and `100` respectively.

[[java-rest-high-x-pack-ml-get-calendars-execution]]
==== Execution
The request can be executed through the `MachineLearningClient` contained
in the `RestHighLevelClient` object, accessed via the `machineLearningClient()` method.

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/MlClientDocumentationIT.java[x-pack-ml-get-calendars-execution]
--------------------------------------------------

[[java-rest-high-x-pack-ml-get-calendars-execution-async]]
==== Asynchronous Execution

The request can also be executed asynchronously:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/MlClientDocumentationIT.java[x-pack-ml-get-calendars-execute-async]
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<1> The `GetCalendarsRequest` to execute and the `ActionListener` to use when
the execution completes

The asynchronous method does not block and returns immediately. Once it is
completed the `ActionListener` is called back with the `onResponse` method
if the execution is successful or the `onFailure` method if the execution
failed.

A typical listener for `GetCalendarsResponse` looks like:

["source","java",subs="attributes,callouts,macros"]
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include-tagged::{doc-tests}/MlClientDocumentationIT.java[x-pack-ml-get-calendars-listener]
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<1> `onResponse` is called back when the action is completed successfully
<2> `onFailure` is called back when some unexpected error occurs

[[java-rest-high-x-pack-ml-get-calendars-response]]
==== Get calendars Response

The returned `GetCalendarsResponse` contains the requested calendars:

["source","java",subs="attributes,callouts,macros"]
--------------------------------------------------
include-tagged::{doc-tests}/MlClientDocumentationIT.java[x-pack-ml-get-calendars-response]
--------------------------------------------------
<1> The count of calendars that were matched
<2> The calendars retrieved