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Example of a Bucket VTA

Example of a Bucket VTA

Overview of Bucket VTA Example

In this example each subscriber has a bucket account; that is, an account that is periodically measured and refilled depending on the usage of the account.

In this example, there are two bucket sizes:

Behaving bucket size—2 GB
Misbehaving bucket size—1 GB

The rate at which the buckets are refilled depends on usage. If the subscriber is staying within the behaving rate, the bucket account is refilled at the rate of 2 GB per week. If the subscriber is exceeding the behaving rate, the bucket account is refilled at the rate of 1 GB per week:

Behaving refill rate—3550 bps, or 2 GBs per 7 days
Misbehaving refill rate —1775 bps, or 1 GB per 7 days

Events for Bucket VTA

The bucket VTA example has the following events:

Event Handlers for Bucket VTA

The bucket VTA includes the following event handlers.

GetBucket Event Handler

The GetBucket event handler retrieves the balance of the bucket account when the subscriber logs in.

RefillBucketWithBehavingRate Event Handler

The RefillBucketWithBehavingRate event handler refills the bucket with the behaving rate and starts the behaving service if the bucket account has a positive balance.

UpdateBehavingUsage Event Handler

The UpdateBehavingUsage event handler updates the bucket account with the usage from the behaving service.

ToMisbehaving Event Handler

The ToMisbehaving event handler changes the subscriber to misbehaving mode when the bucket has zero or negative balance.

Database Engine Processor for Bucket VTA

The bucket VTA contains a database engine processor that is configured as follows.

Account Update Scripts

The database engine processor contains two account update scripts:

DebitBehavingUsage—Debits the usage of the behaving service from the bucket account and resets the balance of the bucket account based on the new balance.
RefillBucketWithBehavingRate—Refills the bucket account with the behaving rate.