tibasSpace_CompareAndPutEx()
Compares the values in a specified tuple with existing data. If the old value is unmodified, replaces the existing tuple with the specified value. Allows you to set lock and lock wait attributes for the tuple.
Declaration
tibas_status tibasSpace_CompareAndPutEx( tibasSpace space, tibasTuple* value, tibasTuple oldValue, tibasTuple newValue, tibasPutOptions options)
Parameters
| Parameter | Description |
|---|---|
| space | The TIBCO ActiveSpaces entity on which the function is invoked. |
| value | Returns the value of the tuple that is located |
| oldValue | Specifies the value to look for. If you code NULL for this argument, an empty tuple is replaced. |
| newValue | Specifies the new value. |
| options | Provide a tibasPutOptions structure that specifies the options for the put. |
Remarks
Use the tibasSpace_CompareAndPutEx() function to compare the value in a specified tuple with the value in the data store, and if the value is unmodified, replace the existing tuple with the specified value.
tibasSpace_CompareAndPutEx() also allows you to specify additional options for the operation, by passing a tibasPutOptions structure in the options parameter. The tibasPutOptions structure is defined as follows:
struct _tibasPutOptions {
tibas_long entryTTL;
tibas_long lockWait;
tibas_boolean lock;
tibas_boolean unlock;
tibas_boolean forget;
};
The put options are defined as follows:
- entryTTL
- Allows you to define the entry TTL for the tuple that is being put.
- lockWait
- Specifies a lock wait time, in milliseconds.
- lock
- Put the data and lock the tuple.
- unlock
- Unlock the tuple. Only the thread or process that locked the tuple can unlock it.
Lock and unlock are mutually exclusive. If you use one of these, code NULL for the other.
- forget
- Specify this option if you want the system to forget the return. This is useful if you do not need the tuple.