Add support for "waiters" #623
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mtdowling
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Waiters are a client-side abstraction used to poll a resource until a desired state is reached, or until it is determined that the resource will never enter into the desired state. Waiters have been available in AWS SDKs since around 2012, and are now part of Smithy as an additional specification. Note that this PR relies on smithy-jmespath.
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This commit makes a few changes to waiters: 1. I removed and, or, and not. I couldn't think of a real use case for these as I was documenting them, so I am erring on the side of simplicity. 2. I removed the emptyArray comparator. This need more work to properly validate and specify it, and it can actually be acheived using a booleanEquals comparator by checking if a returned length of a value in JMESPath is equal to 0. No need for an extra comparator. 3. I added a new matcher named `inputOutput` that has two top level keys: input and output. This allows both input and output data to be queried *together* for successful operations, solving a longstanding use case we've had for things like making sure the number of autoscaling groups on input matches the number returned on output. 4. Given that and, or, and not was removed, there's no purpose for a standalone "input" matcher, particularly since there's now an "inputOutput" matcher.
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kstich
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smithy-waiters/src/main/java/software/amazon/smithy/waiters/AcceptorState.java
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smithy-waiters/src/main/java/software/amazon/smithy/waiters/ModelRuntimeTypeGenerator.java
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smithy-waiters/src/main/java/software/amazon/smithy/waiters/ModelRuntimeTypeGenerator.java
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smithy-waiters/src/main/java/software/amazon/smithy/waiters/ModelRuntimeTypeGenerator.java
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smithy-waiters/src/main/java/software/amazon/smithy/waiters/PathComparator.java
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kstich
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Nov 6, 2020
smithy-waiters/src/main/java/software/amazon/smithy/waiters/PathComparator.java
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kstich
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Waiters are a client-side abstraction used to poll a resource until a desired state is reached, or until it is determined that the resource will never enter into the desired state.
Waiters have been available in AWS SDKs since around 2012, and are now part of Smithy as an additional specification. Note that this PR relies on smithy-jmespath.