Configuring a locking strategy in the ObjectGrid descriptor XML file

You can define an optimistic, a pessimistic, or no locking strategy on each BackingMap in the WebSphere® eXtreme Scale configuration. [.net programming language only] For the backing maps that you are accessing from WebSphere eXtreme Scale Client for .NET, you must define a pessimistic locking strategy.

Before you begin

Decide which locking strategy you want to use. For more information, see Locking strategies.

Deprecated: Multi-partition transaction operations are deprecated.

About this task

You can configure each BackingMap instance to use one of the following locking strategies:

Optimistic locking mode (default)
Pessimistic locking mode (required for .NET applications)
None

Procedure

Configure a pessimistic locking strategy

With the lockStrategy attribute in the ObjectGrid descriptor XML file:

<?xml version="1.0" encoding="UTF-8"?>
<objectGridConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://ibm.com/ws/objectgrid/config ../objectGrid.xsd"
    xmlns="http://ibm.com/ws/objectgrid/config">

    <objectGrids>
        <objectGrid name="test">
            <backingMap name="pessimisticMap"
                lockStrategy="PESSIMISTIC"/>
        </objectGrid>
    </objectGrids>
</objectGridConfig>

Configure an optimistic locking strategy

With the lockStrategy attribute in the ObjectGrid descriptor XML file:

<?xml version="1.0" encoding="UTF-8"?>
<objectGridConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://ibm.com/ws/objectgrid/config ../objectGrid.xsd"
    xmlns="http://ibm.com/ws/objectgrid/config">
    <objectGrids>
        <objectGrid name="test">
            <backingMap name="optimisticMap"
                lockStrategy="OPTIMISTIC"/>
        </objectGrid>
    </objectGrids>
</objectGridConfig>

Configure a no locking strategy

With the lockStrategy attribute in the ObjectGrid descriptor XML file:

Note: BackingMaps that are configured to use a no locking strategy cannot participate in a multi-partition transaction.

Deprecated: Multi-partition transaction operations are deprecated.

<?xml version="1.0" encoding="UTF-8"?>
<objectGridConfig xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://ibm.com/ws/objectgrid/config ../objectGrid.xsd"
    xmlns="http://ibm.com/ws/objectgrid/config">

    <objectGrids>
        <objectGrid name="test">
            <backingMap name="noLockingMap"
                lockStrategy="NONE"/>
        </objectGrid>
    </objectGrids>
</objectGridConfig>