Chapter 5. Working with Counters

Procedure

1. Create a CLI connection to Data Grid.

2. Run the create counter command with the appropriate arguments.

   1. Create my-weak-counter.

      create counter --concurrency-level=1 --initial-value=5 --storage=PERSISTENT --type=weak my-weak-counter

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   2. Create my-strong-counter.

      create counter --initial-value=3 --storage=PERSISTENT --type=strong my-strong-counter

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3. List available counters.

   ls counters

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4. Verify counter configurations.

   1. Describe my-weak-counter.

      describe counters/my-weak-counter

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      {
          "weak-counter":{
              "initial-value":5,
              "storage":"PERSISTENT",
              "concurrency-level":1
          }
      }

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   2. Describe my-strong-counter.

      describe counters/my-strong-counter

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      {
          "strong-counter":{
              "initial-value":3,
              "storage":"PERSISTENT",
              "upper-bound":5
          }
      }

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Procedure

1. Select a counter.

   counter my-weak-counter

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2. List the current count.

   [//containers/default/counters/my-weak-counter]> ls
   5

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3. Increment the counter value by 2.

   [//containers/default/counters/my-weak-counter]> add --delta=2

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4. Decrement the counter value by -4.

   [//containers/default/counters/my-weak-counter]> add --delta=-4

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