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useMetrics

The useMetrics primitive is used to get a reference to a Metrics object from within a Provider component context.

useMetrics(id?: MaybeAccessor<undefined | string>): Accessor<Metrics | undefined>
TypeDescription
id?MaybeAccessor<undefined | string>

An optional Id for accessing a Metrics object that was named with an Id in the Provider.

returnsAccessor<Metrics | undefined>

A reference to the Metrics object (or undefined if not within a Provider context, or if the requested Metrics object does not exist).

A Provider component is used to wrap part of an application in a context. It can contain a default Metrics object (or a set of Metrics objects named by Id) that can be easily accessed without having to be passed down as props through every component.

The useMetrics primitive lets you either get a reference to the default Metrics object (when called without a parameter), or one of the Metrics objects that are named by Id (when called with an Id parameter).

Example

This example creates the TinyBase objects needed by the Solid primitive or component and calls it from within a reactive root.

import {createRoot} from 'solid-js';
import {
  createCheckpoints,
  createIndexes,
  createMetrics,
  createQueries,
  createRelationships,
  createStore,
} from 'tinybase';
import {useMetrics} from 'tinybase/ui-solid';

createRoot((dispose) => {
  const store = createStore()
    .setTables({
      pets: {
        fido: {species: 'dog', color: 'brown', next: 'felix'},
        felix: {species: 'cat', color: 'black'},
      },
      species: {dog: {price: 5}, cat: {price: 4}},
    })
    .setValues({open: true});
  const metrics = createMetrics(store).setMetricDefinition(
    'highestPrice',
    'species',
    'max',
    'price',
  );
  const indexes = createIndexes(store).setIndexDefinition(
    'bySpecies',
    'pets',
    'species',
  );
  const relationships = createRelationships(store)
    .setRelationshipDefinition('petSpecies', 'pets', 'species', 'species')
    .setRelationshipDefinition('nextPet', 'pets', 'pets', 'next');
  const queries = createQueries(store).setQueryDefinition(
    'petColors',
    'pets',
    ({select, where, param}) => {
      select('color');
      where((getCell) => getCell('species') == param('species'));
    },
    {species: 'dog'},
  );
  const checkpoints = createCheckpoints(store);
  store.setCell('pets', 'fido', 'color', 'walnut');
  checkpoints.setCheckpoint('updated color');
  metrics.getMetric('highestPrice');
  indexes.getSliceIds('bySpecies');
  relationships.getRemoteRowId('petSpecies', 'fido');
  queries.getResultRowIds('petColors');
  useMetrics();
  dispose();
});

Since

v8.3.0