{
  "code": null,
  "collection": "architecture",
  "href": "https://banes-lab.com/ontology#architecture-fallback-pattern",
  "id": "fallback-pattern",
  "kind": "pattern",
  "layer": {
    "href": "https://banes-lab.com/ontology/schema#layer-correctness-core",
    "json": "https://banes-lab.com/json/records/layer/correctness-core",
    "label": "Correctness Core",
    "markdown": "https://banes-lab.com/records/layer/correctness-core.md",
    "ref": "layer:correctness-core"
  },
  "name": "Fallback Pattern",
  "ref": "architecture:fallback-pattern",
  "relations": [
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-alternate-behavior",
          "json": "https://banes-lab.com/json/records/lexicon/alternate-behavior",
          "label": "Alternate Behavior",
          "markdown": "https://banes-lab.com/records/lexicon/alternate-behavior.md",
          "ref": "lexicon:alternate-behavior"
        }
      ],
      "relation": "requires"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-graceful-degradation",
          "json": "https://banes-lab.com/json/records/architecture/graceful-degradation",
          "label": "Graceful Degradation",
          "markdown": "https://banes-lab.com/records/architecture/graceful-degradation.md",
          "ref": "architecture:graceful-degradation"
        }
      ],
      "relation": "reinforces"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-partial-availability",
          "json": "https://banes-lab.com/json/records/lexicon/partial-availability",
          "label": "Partial Availability",
          "markdown": "https://banes-lab.com/records/lexicon/partial-availability.md",
          "ref": "lexicon:partial-availability"
        }
      ],
      "relation": "enables"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-single-behavior-path",
          "json": "https://banes-lab.com/json/records/lexicon/single-behavior-path",
          "label": "Single Behavior Path",
          "markdown": "https://banes-lab.com/records/lexicon/single-behavior-path.md",
          "ref": "lexicon:single-behavior-path"
        }
      ],
      "relation": "conflicts-with"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-stale-reduced-results",
          "json": "https://banes-lab.com/json/records/lexicon/stale-reduced-results",
          "label": "Stale/Reduced Results",
          "markdown": "https://banes-lab.com/records/lexicon/stale-reduced-results.md",
          "ref": "lexicon:stale-reduced-results"
        }
      ],
      "relation": "tensions-with"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#tension-fallback-pattern-stale-reduced-results",
          "json": "https://banes-lab.com/json/records/tension/fallback-pattern-stale-reduced-results",
          "label": "Fallback Pattern / Stale/Reduced Results",
          "markdown": "https://banes-lab.com/records/tension/fallback-pattern-stale-reduced-results.md",
          "ref": "tension:fallback-pattern-stale-reduced-results"
        }
      ],
      "relation": "tensions"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-single-behavior-path",
          "json": "https://banes-lab.com/json/records/lexicon/single-behavior-path",
          "label": "Single Behavior Path",
          "markdown": "https://banes-lab.com/records/lexicon/single-behavior-path.md",
          "ref": "lexicon:single-behavior-path"
        }
      ],
      "relation": "violated-by"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology/schema#vocabulary-severity-contextual",
          "json": "https://banes-lab.com/json/records/vocabulary/severity-contextual",
          "label": "contextual",
          "markdown": "https://banes-lab.com/records/vocabulary/severity-contextual.md",
          "ref": "vocabulary:severity-contextual"
        }
      ],
      "relation": "severity"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-category-error-handling-resilience",
          "json": "https://banes-lab.com/json/records/architecture-category/error-handling-resilience",
          "label": "Error Handling / Resilience",
          "markdown": "https://banes-lab.com/records/architecture-category/error-handling-resilience.md",
          "ref": "architecture-category:error-handling-resilience"
        }
      ],
      "relation": "category"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/ontology#architecture-fail-safe",
          "json": "https://banes-lab.com/json/records/architecture/fail-safe",
          "label": "Fail Safe",
          "markdown": "https://banes-lab.com/records/architecture/fail-safe.md",
          "ref": "architecture:fail-safe"
        }
      ],
      "relation": "refactors"
    },
    {
      "links": [
        {
          "href": "https://banes-lab.com/software-architecture/principles#a-tension-has-a-mechanism",
          "json": "https://banes-lab.com/json/software-architecture/principles/a-tension-has-a-mechanism",
          "label": "A tension has a mechanism",
          "markdown": "https://banes-lab.com/software-architecture/principles/a-tension-has-a-mechanism.md",
          "ref": "chapter:/software-architecture/principles#a-tension-has-a-mechanism"
        },
        {
          "href": "https://banes-lab.com/ontology#architecture-category-error-handling-resilience",
          "json": "https://banes-lab.com/json/ontology/principles/architecture-category-error-handling-resilience",
          "label": "Error Handling / Resilience",
          "markdown": "https://banes-lab.com/ontology/principles/architecture-category-error-handling-resilience.md",
          "ref": "chapter:/ontology#architecture-category-error-handling-resilience"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-category-error-handling-resilience",
          "json": "https://banes-lab.com/json/ontology/lexicon/lexicon-category-error-handling-resilience",
          "label": "Error Handling / Resilience",
          "markdown": "https://banes-lab.com/ontology/lexicon/lexicon-category-error-handling-resilience.md",
          "ref": "chapter:/ontology/lexicon#lexicon-category-error-handling-resilience"
        },
        {
          "href": "https://banes-lab.com/ontology/lexicon#lexicon-category-quality-attributes",
          "json": "https://banes-lab.com/json/ontology/lexicon/lexicon-category-quality-attributes",
          "label": "Quality Attributes",
          "markdown": "https://banes-lab.com/ontology/lexicon/lexicon-category-quality-attributes.md",
          "ref": "chapter:/ontology/lexicon#lexicon-category-quality-attributes"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-vocabulary-severity",
          "json": "https://banes-lab.com/json/ontology/schema/the-vocabulary-severity",
          "label": "Severity levels",
          "markdown": "https://banes-lab.com/ontology/schema/the-vocabulary-severity.md",
          "ref": "chapter:/ontology/schema#the-vocabulary-severity"
        },
        {
          "href": "https://banes-lab.com/ontology/schema#the-resolutions",
          "json": "https://banes-lab.com/json/ontology/schema/the-resolutions",
          "label": "The resolutions",
          "markdown": "https://banes-lab.com/ontology/schema/the-resolutions.md",
          "ref": "chapter:/ontology/schema#the-resolutions"
        }
      ],
      "relation": "linked-from"
    }
  ],
  "summary": "A design pattern that routes a failed call to an alternate provider or response declared in advance.",
  "siblings": {
    "next": {
      "href": "https://banes-lab.com/ontology#architecture-retry-pattern",
      "json": "https://banes-lab.com/json/records/architecture/retry-pattern",
      "label": "Retry Pattern",
      "markdown": "https://banes-lab.com/records/architecture/retry-pattern.md",
      "ref": "architecture:retry-pattern"
    },
    "previous": {
      "href": "https://banes-lab.com/ontology#architecture-error-boundaries",
      "json": "https://banes-lab.com/json/records/architecture/error-boundaries",
      "label": "Error Boundaries",
      "markdown": "https://banes-lab.com/records/architecture/error-boundaries.md",
      "ref": "architecture:error-boundaries"
    }
  },
  "up": {
    "href": null,
    "json": "https://banes-lab.com/json/api/records/architecture",
    "label": "Architecture principles",
    "markdown": "https://banes-lab.com/api/records/architecture.md",
    "ref": "api:records/architecture"
  },
  "aliases": [],
  "exemplar": {
    "after": "const foo = await primaryFooStore.find(id).catch(() => replicaFooStore.find(id));\nif (!foo) throw new FooUnavailableError(id);",
    "before": "const foo = await primaryFooStore.find(id);",
    "lang": "ts",
    "medium": "code"
  },
  "formedBy": null,
  "scope": [
    "service",
    "dependency call"
  ],
  "severity": "contextual"
}