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 willDelete(UpdatableSchema schema, SeriesDefinition ss) throws T2DBException {
    Set<UpdatableSchema> schemas = findDependentSchemas(schema);
    // remove those schemas where the series was "erased"
    Iterator<UpdatableSchema> it = schemas.iterator();
    while(it.hasNext()) {
      UpdatableSchema s = it.next();
      if (s.getSeriesDefinition(ss.getNumber(), false) == null)
        it.remove();
    }
    
    Collection<Surrogate> entities = database.findChronicles(ss, schemas);
    if (entities.size() > 0)

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  @Override
  public UpdatableSchema createSchema(String name, String nameOfBase) throws T2DBException {
    if (getSchemas(name).size() > 0)
      throw T2DBMsg.exception(D.D30108, name);
    UpdatableSchema base = null;
    if (nameOfBase != null && nameOfBase.length() > 0) {
      Collection<UpdatableSchema> list = getUpdatableSchemas(nameOfBase);
      if (list.size() != 1)
        throw T2DBMsg.exception(D.D30109, name, nameOfBase);
      base = list.iterator().next();

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   * additional series, and additional series attributes.
   */
  @Override
  public void willUpdate(UpdatableSchema s) throws T2DBException {
    UpdatableSchemaImpl schema = (UpdatableSchemaImpl) s;
    UpdatableSchema base = schema.getBase();
    UpdatableSchema previousBase = schema.getPreviousBase();
    boolean baseEdited = false;
    if (base != null)
      baseEdited = !base.equals(previousBase);
    else if (previousBase != null)
      baseEdited = true;

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   * Invoke only when base and edited base differ.
   */
  private void willUpdateBase(UpdatableSchema s) throws T2DBException {
    UpdatableSchemaImpl schema = (UpdatableSchemaImpl) s;
    String baseSchemaName = schema.getBase() == null ? null : schema.getBase().getName();
    UpdatableSchema currentUES = new UpdatableSchemaImpl(schema.getName(), 
        schema.getPreviousBase(), schema.getAttributeDefinitions(), schema.getSeriesDefinitions(), 
        schema.getSurrogate());
    UpdatableSchema editedUES = new UpdatableSchemaImpl(schema.getName(), 
        schema.getBase(), schema.getAttributeDefinitions(), schema.getSeriesDefinitions(), 
        schema.getSurrogate());
    Schema current = database.resolve(currentUES);
    Schema edited = database.resolve(editedUES);
    if (current.getAttributeDefinitions().size() > edited.getAttributeDefinitions().size())

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    Set<UpdatableSchema> schemas = findDependentSchemas(schema);
    // remove those schemas where the attribute was "erased"
    Iterator<UpdatableSchema> it = schemas.iterator();
    while(it.hasNext()) {
      UpdatableSchema s = it.next();
      if (s.getAttributeDefinition(def.getNumber(), false) == null)
        it.remove();
    }
    
    Collection<Surrogate> entities = database.findChronicles(def.getProperty(), schemas);
    if (entities.size() > 0)

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    String name = schema.getName();
    Set<UpdatableSchema> result = new HashSet<UpdatableSchema>();
    result.add(schema);
    Set<String> cycleDetector = new LinkedHashSet<String>();
    for (UpdatableSchema s : schemas) {
      UpdatableSchema base = s.getBase();
      cycleDetector.clear();
      cycleDetector.add(s.getName());
      while (base != null) {
        if (base.getName().equals(name)) {
          if (!cycleDetector.add(base.getName()))
            throw T2DBMsg.exception(D.D30147, schema.getName(), cycleDetector.toString());
          result.add(s);
          break;
        } else
          base = base.getBase();
      }
    }
    return result;
  }

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  @Override
  public UpdatableSchema createSchema(String name, String nameOfBase) throws T2DBException {
    if (getSchemas(name).size() > 0)
      throw T2DBMsg.exception(D.D30108, name);
    UpdatableSchema base = null;
    if (nameOfBase != null && nameOfBase.length() > 0) {
      Collection<UpdatableSchema> list = getUpdatableSchemas(nameOfBase);
      if (list.size() != 1)
        throw T2DBMsg.exception(D.D30109, name, nameOfBase);
      base = list.iterator().next();

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    return getReadMethodsForSchema().getSchemaSurrogateList(this, pattern);
  }


  @Override
  public UpdatableSchema getUpdatableSchema(Surrogate surrogate) throws T2DBException {
    UpdatableSchema schema = getReadMethodsForSchema().getSchema(surrogate);
    if (schema == null)
      throw T2DBMsg.exception(E.E30109, surrogate.toString());
    return schema;
  }

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    }
  }
  
  public void test028_create_schema() {
    try {
      UpdatableSchema schema = db.createSchema("foo schema", null);
      schema.addAttribute(2);
      schema.setAttributeProperty(2, db.getProperty("foo property", true));
      schema.setAttributeDefault(2, "bar");
      schema.addSeries(1);
      schema.setSeriesName(1, "fooser");
      schema.setSeriesType(1, "numeric");
      schema.setSeriesTimeDomain(1, Day.DOMAIN);
      schema.applyUpdates();
      assertEquals("foo property", db.getSchemas("foo schema").iterator().next().
          getAttributeDefinition(2, true).getName());
    } catch (Exception e) {
      fail(e.getMessage());
    }

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  private static final String SERIES2 = CHRONICLE + ".seriestest.test";


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

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Related Classes of ch.agent.crnickl.api.UpdatableSchema

ch.agent.crnickl.impl.DatabaseBackendImpl

ch.agent.crnickl.impl.SchemaUpdatePolicyImpl

ch.agent.crnickl.impl.UpdatableSchemaImpl

ch.agent.crnickl.jdbc.JDBCDatabase

ch.agent.crnickl.jdbc.ReadMethodsForSchema

ch.agent.crnickl.jdbc.WriteMethodsForSchema

ch.agent.crnickl.junit.T015_SchemaChronicleSeriesValueTest

ch.agent.crnickl.junit.T017_SchemaTest

ch.agent.crnickl.junit.T040_SeriesTest

ch.agent.crnickl.junit.T041_UpdatableSeriesTest

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