Managed Object - HistoryCollector

Extended by
EventHistoryCollector, TaskHistoryCollector

Managed Object Description

This managed object type enables clients to retrieve historical data and receive updates when the server appends new data to a collection. This is a base type for item-specific types related to event or task history. Historical data is inherently append-only, although a server administrator may periodically purge old data.

Typically, a client creates a history collector by using a filter on a potentially large set, such as all the events in a datacenter. The collector provides access to the items that match the filter, which could also be a relatively large set.

The items in a collector are always ordered by date and time of creation. Item properties normally include this time stamp.

The client may set the "viewable latest page" for the collector, which is the contiguous subset of the items that are of immediate interest. These items are available as the "latestPage" property, which the client may retrieve and monitor by using the PropertyCollector managed object.

Clients can change the page size of the "latestPage" by using setLatestPageSize().

The client may use the following features of the history collector.

Properties

Name Type Description
filterxsd:anyType The filter used to create this collector.

The type of the returned filter is determined by the managed object for which the collector is created.


Methods

Methods defined in this Managed Object
DestroyCollector, ResetCollector, RewindCollector, SetCollectorPageSize

DestroyCollector

Destroys this collector.
Required Privileges
None

Parameters

NameTypeDescription
_thisManagedObjectReference A reference to the HistoryCollector used to make the method call.

Return Value

Type Description
None

Faults

Type Description
RuntimeFaultThrown if any type of runtime fault is thrown that is not covered by the other faults; for example, a communication error.

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ResetCollector

Moves the "scrollable view" to the item immediately preceding the "viewable latest page". If you use "readPrev", ReadPreviousTasks or ReadPreviousEvents, all items are retrieved from the newest item to the oldest item.
Required Privileges
None

Parameters

NameTypeDescription
_thisManagedObjectReference A reference to the HistoryCollector used to make the method call.

Return Value

Type Description
None

Faults

Type Description
RuntimeFaultThrown if any type of runtime fault is thrown that is not covered by the other faults; for example, a communication error.

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RewindCollector

Moves the "scrollable view" to the oldest item. If you use ReadNextTasks or ReadNextEvents, all items are retrieved from the oldest item to the newest item. This is the default setting when the collector is created.
Required Privileges
None

Parameters

NameTypeDescription
_thisManagedObjectReference A reference to the HistoryCollector used to make the method call.

Return Value

Type Description
None

Faults

Type Description
RuntimeFaultThrown if any type of runtime fault is thrown that is not covered by the other faults; for example, a communication error.

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SetCollectorPageSize

Sets the "viewable latest page" size to contain at most the number of items specified by the maxCount parameter).

Required Privileges
None

Parameters

NameTypeDescription
_thisManagedObjectReference A reference to the HistoryCollector used to make the method call.
maxCountxsd:int The maximum number of items in the page.

Return Value

Type Description
None

Faults

Type Description
InvalidArgumentThrown if maxCount is out of range.
RuntimeFaultThrown if any type of runtime fault is thrown that is not covered by the other faults; for example, a communication error.

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