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Policy Execution Order
Architecture
Persist a Response Cache Map in the Gateway Resource.
Each key-value pair in the Response Cache Map will be:
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{ |
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policy_instance_id: Google Guava Cache, |
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... |
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} |
Each Google Guava Cache will have has the key-value pairs:
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{ |
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[ Hash Hex of params specified by policy ]: Cached HTTP Response |
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} |
Each Cached HTTP Response will hold contains the following information:
Original HTTP Response Object for preserving the flow of handling HTTP responses in the Gateway Resource.
byte[]of the response content to preserve the stream that cannot be rewound.
Expired caches cannot be accessed and new entries
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overwrite any existing ones.
policy versionto determine if the policy has been updated since the last save. An update to the policy will direct the flow to acquire a new HTTP response and overwrite the existing
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The persisted HTTP response will leverage the existing Gateway Resource flows so that response policies and compressions can be applied the cached HTTP response it as if it were a regular HTTP response that is acquired from a normal HTTP request (without a caching policy).
Provide a maintenance routine to clear out invalidated caches every 12 hours.
one.
Limitations
We do limit the response cache to have a response less than the MAX_CACHE_BYTES which is a feature flag default to a value of 90000000 bytes which is equivalent to 85.83 MB (edited)
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Parameter Name | Description | Default Value |
|---|---|---|
Label | Required. The name for the API policy. | HTTP Respone Cache |
When this policy should be applied | An expression-enabled field that determines the condition to be fulfilled for the API policy to execute. For example, if the value in this field is | N/A |
Cache Interval | The time period of the current cache before it is refreshed. | 1 |
Time Unit | The time unit for the Cache Interval value. | Hour |
Use HTTP Request Headers to Create Cache Keys | Enables the use of specific headers to identify a cache. | Unselected |
Use HTTP Request Query Parameter to Create Cache Keys | Enables the use of query parameters to identify a cache. | Unselected |
Status | Specifies whether the API policy is enabled or disabled. | Enabled |
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