signalk-parquet
Version:
Vessel data Parquet file archive with automated value and geospatial triggers. History API compliant with cloud backups and queries.
73 lines • 2.1 kB
TypeScript
/**
* Centralized cache configuration defaults
* These values can be adjusted based on system resources and usage patterns
*/
/**
* Cache Time-To-Live (TTL) values in milliseconds
*/
export declare const CACHE_TTL: {
/**
* Schema cache TTL - schemas are relatively static
* Increase if schema changes are rare, decrease if schema changes frequently
* @default 30 minutes
*/
readonly SCHEMA: number;
/**
* File list cache TTL - used for context discovery
* Increase for better performance, decrease for more real-time file discovery
* @default 2 minutes
*/
readonly FILE_LIST: number;
/**
* Path and context cache TTL - used for query optimization
* Increase for better cache hit rate, decrease for more up-to-date results
* @default 1 minute
*/
readonly PATH_CONTEXT: number;
/**
* Directory scanner cache TTL - used during consolidation
* Increase for better performance on large file systems
* @default 5 minutes
*/
readonly DIRECTORY_SCAN: number;
};
/**
* Cache size limits
*/
export declare const CACHE_SIZE: {
/**
* Maximum number of path/context cache entries
* Each entry is relatively small (~100 bytes)
* @default 100 entries
*/
readonly PATH_CONTEXT_MAX: 100;
/**
* Maximum number of data buffer entries (LRU cache)
* Each entry can be several KB depending on data volume
* @default 1000 entries
*/
readonly DATA_BUFFER_MAX: 1000;
};
/**
* Concurrency limits
*/
export declare const CONCURRENCY: {
/**
* Maximum concurrent DuckDB queries in History API
* Increase for better throughput on powerful systems
* Decrease to prevent resource exhaustion
* @default 10 concurrent queries
*/
readonly MAX_QUERIES: 10;
};
/**
* Default query parameters
*/
export declare const QUERY_DEFAULTS: {
/**
* Default time resolution for queries (milliseconds)
* @default 60000 (1 minute)
*/
readonly RESOLUTION_MS: 60000;
};
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