Examples of ch.agent.crnickl.api.UpdatableSchema

ch.agent.crnickl.api.UpdatableSchema
An UpdatableSchema is a schema which can be modified. A schema can only be modified if it is not in use or if the modification has no consequence on existing use. For example a series can always be added but can only be deleted if no chronicle using the schema has actually created the series.
Updatable schemas are not only used in client applications like schema editors but also by CrNiCKL internally. Any schema can be defined as an extension to another schema. Schemas are kept in permanent storage without resolving these extensions. Before a schema is made available for use, CrNiCKL resolves the extensions. Extensions are visible to clients only in edit mode.
A hypothetical example will help to illustrate how schemas are constructed. The example uses 3 schemas: a, b, and c. Schema a defines two series, s1 and s2, and one attribute, a1. Schema b extends schema a; it removes series s2, and adds series s3. Schema c extends schema b; it adds attribute a2 and redefines attribute a1 (for example with a different default value). Given this design, a chronicle with effective schema c, will have two series, s1 and s3, and two attributes, a1 and a2. It will not be aware of the existence of schemas a and b. @author Jean-Paul Vetterli @version 1.1.0

    }
  }
  
  public void test_delete_chronicle_attribute_with_actual_values() {
    try {
      UpdatableSchema schema = db.getUpdatableSchemas("schema1a").iterator().next();


      // use the attribute
      UpdatableChronicle chro = db.getChronicle("bt.schema1achro", true).edit();
      assertEquals("t1v1", chro.getAttribute("prop1", true).get().toString());
      Attribute<?> a = chro.getAttribute("prop1", true);
      a.scan("t1v2");
      assertEquals("t1v2", a.get().toString());
      chro.setAttribute(a);
      chro.applyUpdates();
      assertEquals("t1v2", chro.getAttribute("prop1", true).get().toString());
      schema.deleteAttribute(1);
      schema.applyUpdates();
      expectException();
    } catch (Exception e) {
      assertException(e, null, D.D30146);
    }
  }

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      assertEquals("t1v3", a.get().toString());
      chro.setAttribute(a);
      chro.applyUpdates();
      assertEquals("t1v3", chro.getAttribute("prop1", true).get().toString());
      // remove the attribute from the base schema of schema3 (should fail)
      UpdatableSchema schema1 = db.getUpdatableSchemas("schema1a").iterator().next();
      schema1.deleteAttribute(1);
      schema1.applyUpdates();
      expectException();
    } catch (Exception e) {
      assertException(e, null, D.D30146);
    }
  }

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  public void test_erase_attribute_in_use() {
    try {
      // erase attribute 
      Chronicle chro = db.getChronicle("bt.schema3chro", true);
      assertEquals("t1v3", chro.getAttribute("prop1", true).get().toString());
      UpdatableSchema schema3 = db.getUpdatableSchemas("schema3").iterator().next();
      schema3.addAttribute(1);
      schema3.eraseAttribute(1);
      schema3.applyUpdates();
      assertEquals(null, schema3.getAttributeDefinition("prop1", false));
      expectException();
    } catch (Exception e) {
      assertException(e, D.D30105, D.D30146);
    }
  }

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      a.reset();
      chro.setAttribute(a);
      chro.applyUpdates();
      assertEquals("t1v2", chro.getAttribute("prop1", true).get().toString());
      
      UpdatableSchema schema3 = db.getUpdatableSchemas("schema3").iterator().next();
      schema3.addAttribute(1);
      schema3.eraseAttribute(1);
      schema3.applyUpdates();
      assertEquals(null, schema3.getAttributeDefinition("prop1", false));
      // value still here because it's the default value, which is not in the chronicle
      assertEquals("t1v2", chro.getAttribute("prop1", true).get().toString());
    } catch (Exception e) {
      fail(e.getMessage());
    }

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    }
  }
  
  public void test_delete_schema_in_use() {
    try {
      UpdatableSchema schema1 = db.getSchemas("schema1a").iterator().next().edit();
      schema1.destroy();
      schema1.applyUpdates();
      expectException();
    } catch (Exception e) {
      assertException(e, D.D30140);
    }
  }

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      a.scan("t1v1");
      chro.setAttribute(a);
      chro.applyUpdates();
      assertEquals("t1v1", chro.getAttribute("prop1", true).get().toString());
      // now change the default
      UpdatableSchema uschema1 = schema1.edit();
      uschema1.setAttributeDefault(1, "t1v2");
      uschema1.applyUpdates();
      // expect that the attribute value has changed because t1v1 above was not set, being the default 
      Chronicle c = db.getChronicle("bt.schema1achro2", true);
      assertEquals("t1v1", c.getAttribute("prop1", true).get().toString());
    } catch (Exception e) {
      fail(e.getMessage());

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    // create "Ticker" property
    UpdatableProperty<String> p = db.createProperty("Ticker", vt, true);
    p.applyUpdates();
      
    // create "Stocks" schema, with a "Ticker" property and a "price" series
    UpdatableSchema schema = db.createSchema("Stocks", null);
    schema.addAttribute(2);
    schema.setAttributeProperty(2, p);
    schema.addSeries(1);
    schema.setSeriesName(1, "price");
    schema.setSeriesType(1, "numeric");
    schema.setSeriesTimeDomain(1, Day.DOMAIN);
    schema.applyUpdates();
      
    db.commit();
  }

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  private static final String SERIES = "bt.t040.test";


  @Override
  protected void firstSetUp() throws Exception {
    db = getContext().getDatabase();
    UpdatableSchema s = db.createSchema("t040", null);
    s.addSeries(1);
    s.setSeriesName(1, "test");
    s.setSeriesType(1, "numeric");
    s.setSeriesTimeDomain(1, Day.DOMAIN);
    s.applyUpdates();
    String split[] = db.getNamingPolicy().split("bt.t040");
    UpdatableChronicle c = db.getTopChronicle().edit().createChronicle(split[1], false, "test entity", null, s.resolve());
    c.applyUpdates();
    db.commit();
  }

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  }


  private void listSchemas(String pattern) throws Exception {
    Collection<UpdatableSchema> schemas = db.getUpdatableSchemas(pattern);
    for (UpdatableSchema schema : schemas) {
      UpdatableSchema base = schema.getBase();
      if (base == null)
        System.out.println(schema.getName());
      else
        System.out.println(schema.getName() + "--->" + schema.getBase().getName());
    }

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    }
  }
  
  public void test_create_schema_failure_series_name_used_twice () {
    try {
      UpdatableSchema schema = db.createSchema("schema1", null);
      schema.addSeries(1);
      schema.setSeriesName(1, "x25");
      schema.addSeries(2);
      // name already used
      schema.setSeriesName(2, "x25");
      expectException();
    } catch (Exception e) {
      assertException(e, D.D30153);
    }
  }

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ch.agent.crnickl.junit.T040_SeriesTest

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