43 lines
1.5 KiB
PHP
43 lines
1.5 KiB
PHP
<?php
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// {{{ICINGA_LICENSE_HEADER}}}
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// {{{ICINGA_LICENSE_HEADER}}}
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namespace Icinga\Protocol\Statusdat\View;
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/**
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* Interface for statusdat classes that provide a specific view on the dataset
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*
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* Views define special get and exists operations for fields that are not directly available
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* in a resultset, but exist under another name or can be accessed by loading an additional object
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* during runtime.
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*
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* @see Icinga\Backend\DataView\ObjectRemappingView For an implementation of mapping field names
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* to storage specific names, e.g. service_state being status.current_state in status.dat views.
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*
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* @see Icinga\Backend\MonitoringObjectList For the typical usage of this class. It is not wrapped
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* around the monitoring object, so we don't use __get() or __set() and always have to give the
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* item we'd like to access.
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*/
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interface AccessorStrategy
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{
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/**
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* Returns a field for the item, or throws an Exception if the field doesn't exist
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*
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* @param $item The item to access
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* @param $field The field of the item that should be accessed
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* @return string The content of the field
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*
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* @throws \InvalidArgumentException when the field does not exist
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*/
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public function get(&$item, $field);
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/**
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* Returns true if the field exists on the specific item, otherwise false
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*
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* @param $item The item to access
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* @param $field The field to check on the $item
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* @return bool True when the field exists, otherwise false
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*/
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public function exists(&$item, $field);
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}
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