Autoupdate service interface
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FinnStutzenstein
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These are 5 examples for ModelRequests on a given dataset with the expected
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results. There are 6 models:
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- A, B, C, D: some models with a common `title` attribute and an attribute per
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model (a, b, c, d).
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- G1, G2: Some models with generic relations.
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Relations:
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- A <-1---1-> B (B_id <-> A_id)
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- A <-1---n-> C (C_ids <-> A_id)
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- B <-n---m-> C (C_ids <-> B_ids)
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- B <-1---n-> B selfreference modeling a tree (B_children_ids <-> B_parent_id)
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- B <-n---m-> D with structured keys on D's side. The numbers are not related to
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any ids. (D_ids <-> B_<number>_ids)
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- G1 <-n---m-> A,C (content_object_ids <-> G1_ids)
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- G2 <-1---1-> A,B (content_object_id <-> G2_id)
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Notes about the value `null`: If a field is not present, its value is implicit
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`null`. Fields with `null` as value are included in the ModelResponse but not
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the dataset. This means, that there might be references without a reverse part in
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the dataset, but this is fine, as the missing part is implicitly `null`. If a
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field is deleted in the dataset, there is an update with `null` as the value of
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the field.
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Dataset: {
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A: [{
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id: 1,
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a: "a1",
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title: "a1",
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B_id: 1,
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C_ids: [],
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G1_ids: [1, 2],
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}, {
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id: 2,
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a: "a2",
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title: "a2",
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C_ids: [1, 2],
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G1_ids: [],
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}],
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B: [{
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id: 1,
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b: "b1",
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title: "b1";
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A_id: 1,
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C_ids: [1],
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G2_id: 1,
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B_children_ids: [2],
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D_ids: [1],
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}, {
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id: 2,
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b: "b2",
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title: "b2",
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C_ids: [1, 2],
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B_parent_id: 1,
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B_children_ids: [],
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D_ids: [1, 2],
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}],
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C: [{
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id: 1,
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c: "c1",
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title: "c1",
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A_id: 2,
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B_ids: [1, 2],
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G1_ids: [2, 3],
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}, {
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id: 2,
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c: "c2",
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title: "c2",
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A_id: 2,
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B_ids: [2],
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G1_ids: [2, 3],
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}],
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D: [{
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id: 1,
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d: "d1",
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B_1_ids: [1, 2],
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B_2_ids: [1],
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B_3_ids: [],
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}, {
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id: 2,
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d: "d2",
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B_1_ids: [],
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B_4_ids: [2],
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}],
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G1: [{
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id: 1,
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g1: "g1.1",
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content_object_ids: ["A/1"],
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}, {
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id: 2,
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g1: "g1.2",
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content_object_ids: ["A/1", "C/1", "C/2"],
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}, {
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id: 3,
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g1: "g1.3",
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content_object_ids: ["C/1", "C/2"],
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}],
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G2: [{
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id: 1,
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g2: "g2.1",
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content_object_id: "B/1",
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}]
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}
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I: Basic
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Note:
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- The basic structure
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- The empty model B/1 in the response
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- The provided references, e.g. A/2/C_ids in the response
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ModelRequest: {
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collection: "A",
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ids: [1, 2],
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fields: {
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a: null,
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C_ids: {
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collection: "C",
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fields: {
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c: null,
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G1_ids: {
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collection: "G1",
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fields: {
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g1: null,
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}
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}
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}
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},
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B_id: {
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collection: "B",
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fields: {},
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},
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G1_ids: {
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collection: "G1"
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fields: {
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g1: null,
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}
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}
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}
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}
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ModelData: {
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A: {
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1: {
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a: "a1",
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C_ids: [],
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B_id: 1,
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},
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2: {
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a: "a2",
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C_ids: [1, 2],
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}
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},
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B: {
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1: {}
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}
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C: {
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1: {
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c: "c1",
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G1_ids: [2, 3],
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},
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2: {
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c: "c2",
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G1_ids: [2, 3],
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}
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},
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G1: {
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1: {
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g1: "g1.1",
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},
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2: {
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g1: "g1.2",
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},
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3: {
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g1: "g1.3",
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}
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}
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}
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II: Partial merged fields, generic lookup
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Note:
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- different fields for B/1 and B/2 in the response
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- different fields for C/1 and C/2 in the response
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- The generic lookup from G2/1 to B/1
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ModelRequest: {
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collection: "G2"
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ids: [1],
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fields: {
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content_object_id: {
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fields: {
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B_children_ids: {
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collection: "B",
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fields: {
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C_ids: {
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collection: "C",
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fields: {
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c: null,
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}
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},
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B_parent_id: null,
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}
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},
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C_ids: {
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collection: "C",
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fields: {
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c: null,
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title: null,
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}
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},
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G2_id: null
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}
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}
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}
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}
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ModelData: {
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B: {
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1: {
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B_children: [2],
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C_ids: [1],
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G1_id: 1,
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},
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2: {
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C_ids: [1, 2],
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B_parent_id: 1,
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}
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G2: {
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1: {
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content_object_id: "B/1",
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}
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},
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C: {
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1: {
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c: "c1",
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title: "c1",
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},
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2: {
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c: "c2",
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}
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}
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}
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III: non-existent ids, fields, fqids, references, generic relations and felder ohne referenz
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Note:
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- id 4 of G1 does not exist
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- some fields does not exist
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- some fields with indicated references does not exist (fine, until there is
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no data. If there is data, this will cause an parsing-error at runtime)
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- All these cases are fine
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ModelRequest: {
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collection: "G1",
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ids: [2, 4], # 4 does not exists
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fields: {
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content_object_ids: {
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fields: {
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a: null,
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b: null,
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not_existent: {
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key: null,
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},
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title: null,
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G1_ids: null,
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A_id: null,
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}
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}
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}
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}
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ModelData: {
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G1: {
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2: {
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content_object_ids: ["A/1", "C/1", "C/2"],
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}
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},
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A: {
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1: {
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a: "a1",
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title: "a1",
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G1_ids: [1, 2],
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}
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},
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C: {
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1: {
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title: "c1",
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A_id: 2,
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G1_ids: [2, 3],
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},
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2: {
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title: "c2",
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A_id: 2,
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G1_ids: [2, 3],
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}
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}
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}
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IV: structured fields without references
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Note:
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- `B_` is handled as a prefix
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ModelRequest: {
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collection: "D",
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ids: [1, 2],
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fields: {
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d: null,
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B_: null,
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}
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}
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ModelData: {
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D: {
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1: {
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d: "d1",
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B_1_ids: [1, 2],
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B_2_ids: [1],
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B_3_ids: [],
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},
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2: {
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d: "d2",
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B_1_ids: [],
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B_4_ids: [2],
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}
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}
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}
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V: structed references
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Note:
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- `B_` and `B_4_ids` are handled as prefixes (`B_4_ids` has only one match)
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- All references are followed
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- The different fields for B/1 and B/2 in the response
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ModelRequest: {
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collection: "D",
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ids: [1, 2],
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fields: {
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B_: {
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collection: "B",
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fields: {
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b: null,
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}
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},
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B_4_ids: {
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collection: "B",
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fields: {
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title: null,
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}
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}
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}
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}
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ModelData: {
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D: {
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1: {
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d: "d1",
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B_1_ids: [1, 2],
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B_2_ids: [1],
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B_3_ids: [],
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},
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2: {
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d: "d2",
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B_1_ids: [],
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B_4_ids: [2],
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}
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},
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B: {
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1: {
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b: "b1",
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},
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2: {
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b: "b2",
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title: "b2",
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}
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}
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}
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@ -0,0 +1,102 @@
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/**
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* This is a chatch-all exception for some invalid parameters
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*/
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Exception InvalidFormat(msg: string);
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/**
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* This exception is thrown, when parsing model data. E.g. there is an indicated
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* relation to a key, but the data are no foreign ids/fqids. The exception may
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* happen, if the stream is used at runtime, because this cannot be detected
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* when the caller makes the request.
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*/
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Exception ParsingError(msg: string);
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/**
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* This methods subscribes to the given request. The response is a stream
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* (language dependent) updating all models according to the ModelRequest if new
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* data is available. On subscription, initial data must be pushed to the caller
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* as soon as possible. The stream can be closed by closing the stream (e.g. the
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* underlying network connection).
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*
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* @throws InvalidFormat
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* @throws ParsingError
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*/
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subscribe(request: ModelRequest): stream<ModelData>;
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/**
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* This is the main interface for requesting models in a structured, nested way.
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* The initial request targets some models as the root models of one collection
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* with all the same fields. This build a tree of dependencies, because the
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* value of some fields may be a GenericModelDescriptor again.
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*
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* For a description of `fields` and `collection`, see GenericModelDescriptor
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* and ModelDescriptor.
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*
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* `ids`: This is a list of ids for a collection, that should be provided. All
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* models, that the user can see, must be included in the response. The model
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* fields are handled according to `GenericModelDescriptor`.
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*/
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Interface ModelRequest {
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ids: ID[];
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collection: Collection;
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fields: {
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[field: Field]: GenericModelDecriptor | null;
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}
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}
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/**
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* For an overview, see `ModelRequest`.
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*
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* `fields`:
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* All fields are handled as prefixes being aware of strutured fields. If a
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* field is given, all fields with the given field as a prefix are included.
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* E.g. if the field is `my_field`, the fields `my_field`, `my_field_3` and
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* `my_fields` are included.
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*
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* Regardless of the value of a field, the restricted values are given in the
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* response (multiple for structured fields). If the restricted value is null,
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* the field must be included here.
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*
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* Note that the fields may be empty in the request or empty after restriction.
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* The client gets an empty model, but *gets* a model. Only if the model does
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* not exist or the user cannot see the model, there will be no model in the
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* response.
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*
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* If the value is not null, it is indicated, that there is a reference to
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* follow. There are two types of values:
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* - GenericModelDescriptor: The reference is a generic one. This means, that
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* the actual value from the model is a fqid or an array of fqids.
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* - ModelDescriptor: A collection is given, so it can be expected, that the
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* actual model value is an id or an array of ids.
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*/
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Interface GenericModelDecriptor {
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fields: {
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[field: Field]: GenericModelDecriptor | null;
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}
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}
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/**
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* For an overview, see `ModelRequest`.
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*
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* `collection`:
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* This is the collection, the ids are associated to. The ids are provided with
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* two different ways:
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* - In a ModelRequest, the ids are given.
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* - If this interface is used in a field indication a relation, the id(s) are
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* given by the actual model data.
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*/
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Interface ModelDescriptor extends GenericModelDescriptor {
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collection: Collection;
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}
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/**
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* This structure holds all data given by the called service structured by
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* fqids. Each fqid contains the (partial, restricted) data for the fqid.
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*/
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Interface ModelData {
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[collection: Collection]: {
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[id: Id]: {
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[field: Field]: Value;
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};
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};
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}
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@ -19,7 +19,7 @@ Example:
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* @throws ObjectNotFound
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do_it(data: MyRequest): void publishes MyEvent;
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interface MyRequest {
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Interface MyRequest {
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id: Id;
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text: string;
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some_other_value: number;
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