51 lines
1.2 KiB
Plaintext
51 lines
1.2 KiB
Plaintext
:title
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INIT
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:sig
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INIT(Request& context)
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:see
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>1_COMPONENT
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>1_ONCE
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>1_RENDER
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>1_WS
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>3_C++ Preprocessor
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>unit_call
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:content
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Defines a worker-load hook for the current `.uce` unit.
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When a worker loads the unit's compiled shared object into memory, the runtime checks whether the unit exposes `INIT(Request& context)`. If it does, the hook runs once for that load before the unit begins serving later requests from that in-memory copy.
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Because UCE usually loads units on demand during a request, `INIT()` still receives a valid `Request& context`. Use it for worker-local initialization, not for request-local state that should reset each request.
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## Typical Uses
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- warm caches or parse static lookup data into globals
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- initialize worker-local helper state for expensive component trees
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- perform one-time registration work for that unit's in-memory copy
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## Example
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```cpp
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std::map<String, String> cached_labels;
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INIT(Request& context)
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{
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if(cached_labels.empty())
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cached_labels["ready"] = "Ready";
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}
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COMPONENT(Request& context)
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{
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<>
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<p><?= cached_labels["ready"] ?></p>
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</>
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}
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```
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## Related Concepts
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- PHP: opcode-cache preload or one-time bootstrap work per worker process
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- JavaScript / Node.js: module-load initialization or lazy singleton setup
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