openstack/deb-murano
Code Issues Proposed changes

Merge "Improve Murano PL docs"

Browse Source
This commit is contained in:
Jenkins 2015-07-24 09:26:58 +00:00 committed by Gerrit Code Review
commit 7945e23d35
1 changed files with 88 additions and 59 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

147
doc/source/draft/appdev-guide/murano_pl/class_templ.rst
View File

@ -321,65 +321,94 @@ strings as all their keys.
The following block constructs are available:
+-----------------------------+---------------------------------------------------------------------------------------+
| Assignment | Explanation |
+=============================+=======================================================================================+
| | Return: value | | returns value from a method |
+-----------------------------+---------------------------------------------------------------------------------------+
| | If: predicate() | | ``predicate()`` is a YAQL expression that must be evaluated to ``True`` or ``False``|
| | Then: | |
| | - code | | The ``Else`` section is optional |
| | - block | | One-line code blocks can be written as scalars rather than an array. |
| | Else: | |
| | - code | |
| | - block | |
+-----------------------------+---------------------------------------------------------------------------------------+
| | While: predicate() | | ``predicate()`` must be evaluated to ``True`` or ``False`` |
| | Do: | |
| | - code | |
| | - block | |
+-----------------------------+---------------------------------------------------------------------------------------+
| | For: variableName | | ``collection`` must be a YAQL expression returning iterable collection or |
| | In: collection | evaluatable array as in assignment instructions, for example, ``[1, 2, $x]`` |
| | Do: | |
| | - code | | Inside a code block loop, a variable is accessible as ``$variableName`` |
| | - block | |
+-----------------------------+---------------------------------------------------------------------------------------+
| | Repeat: | | Repeats the code block specified number of times |
| | Do: | |
| | - code | |
| | - block | |
+-----------------------------+---------------------------------------------------------------------------------------+
| | Break: | | Breaks from loop |
+-----------------------------+---------------------------------------------------------------------------------------+
| | Match: | | Matches the result of ``$valueExpression()`` against a set of possible values |
| | case1: | (cases). The code block of first matched case is executed. |
| | - code | |
| | - block | | If no case matched and the default key is present |
| | case2: | than the ``Default`` code block get executed. |
| | - code | | The case values are constant values (not expressions). |
| | - block | |
| | Value: $valueExpression() | |
| | Default: | |
| | - code | |
| | - block | |
+-----------------------------+---------------------------------------------------------------------------------------+
| | Switch: | | All code blocks that have their predicate evaluated to ``True`` are executed, |
| | $predicate1() : | but the order of predicate evaluation is not fixed. |
| | - code | |
| | - block | |
| | $predicate2() : | |
| | - code | |
| | - block | |
| | Default: | | The ``Default`` key is optional. |
| | - code | |
| | - block | | If no predicate evaluated to ``True``, the ``Default`` code block get executed. |
+-----------------------------+---------------------------------------------------------------------------------------+
| | Parallel: | | Executes all instructions in code block in a separate green threads in parallel. |
| | - code | |
| | - block | |
| | Limit: 5 | | The limit is optional and means the maximum number of concurrent green threads. |
+-----------------------------+---------------------------------------------------------------------------------------+
+---------------------------+---------------------------------------------------------------------------------------+
| Assignment | Explanation |
+===========================+=======================================================================================+
| | Return: value | | Returns value from a method |
+---------------------------+---------------------------------------------------------------------------------------+
| | If: predicate() | | ``predicate()`` is a YAQL expression that must be evaluated to ``True`` or ``False``|
| | Then: | |
| | - code | | The ``Else`` section is optional |
| | - block | | One-line code blocks can be written as scalars rather than an array. |
| | Else: | |
| | - code | |
| | - block | |
+---------------------------+---------------------------------------------------------------------------------------+
| | While: predicate() | | ``predicate()`` must be evaluated to ``True`` or ``False`` |
| | Do: | |
| | - code | |
| | - block | |
+---------------------------+---------------------------------------------------------------------------------------+
| | For: variableName | | ``collection`` must be a YAQL expression returning iterable collection or |
| | In: collection | evaluatable array as in assignment instructions, for example, ``[1, 2, $x]`` |
| | Do: | |
| | - code | | Inside a code block loop, a variable is accessible as ``$variableName`` |
| | - block | |
+---------------------------+---------------------------------------------------------------------------------------+
| | Repeat: | | Repeats the code block specified number of times |
| | Do: | |
| | - code | |
| | - block | |
+---------------------------+---------------------------------------------------------------------------------------+
| | Break: | | Breaks from loop |
+---------------------------+---------------------------------------------------------------------------------------+
| | Match: | | Matches the result of ``$valExpression()`` against a set of possible values |
| | case1: | (cases). The code block of first matched case is executed. |
| | - code | |
| | - block | | If no case matched and the default key is present |
| | case2: | than the ``Default`` code block get executed. |
| | - code | | The case values are constant values (not expressions). |
| | - block | |
| | Value: $valExpression() | |
| | Default: | |
| | - code | |
| | - block | |
+---------------------------+---------------------------------------------------------------------------------------+
| | Switch: | | All code blocks that have their predicate evaluated to ``True`` are executed, |
| | $predicate1(): | but the order of predicate evaluation is not fixed. |
| | - code | |
| | - block | |
| | $predicate2(): | |
| | - code | |
| | - block | |
| | Default: | | The ``Default`` key is optional. |
| | - code | |
| | - block | | If no predicate evaluated to ``True``, the ``Default`` code block get executed. |
+---------------------------+---------------------------------------------------------------------------------------+
| | Parallel: | | Executes all instructions in code block in a separate green threads in parallel. |
| | - code | |
| | - block | |
| | Limit: 5 | | The limit is optional and means the maximum number of concurrent green threads. |
+---------------------------+---------------------------------------------------------------------------------------+
| | Try: | | Try and Catch are keywords that represent the handling of exceptions due to data |
| | - code | or coding errors during program execution. A ``Try`` block is the block of code in |
| | - block | which exceptions occur. A ``Catch`` block is the block of code, that is executed if |
| | Catch: | an exception occurred. |
| | With: keyError | | Exceptions are not declared in Murano PL. It means that exceptions of any types can |
| | As: e | be handled and generated. Generating of exception can be done with construct: |
| | Do: | ``Throw: keyError``. |
| | - code | |
| | - block | |
| | Else: | | The ``Else`` is optional block. ``Else`` block is executed if no exception occurred.|
| | - code | |
| | - block | |
| | Finally: | | The ``Finally`` also is optional. It's a place to put any code that will |
| | - code | be executed, whether the try-block raised an exception or not. |
| | - block | |
+---------------------------+---------------------------------------------------------------------------------------+
Notice, that if you have more then one block construct in your workflow, you
need to insert dashes before each construct. For example::
Body:
- If: predicate1()
Then:
- code
- block
- While: predicate2()
Do:
- code
- block
Object model
------------