Examples of co.cask.cdap.api.dataset.DatasetDefinition

co.cask.cdap.api.dataset.DatasetDefinition
Defines named dataset type implementation. The dataset implementation defines:
- a way to configure new dataset instance by using {@link #configure(String,DatasetProperties)} method
- a way to perform administrative operations on the dataset instance (e.g. create, drop etc.) by providing implementation of {@link DatasetAdmin} via {@link #getAdmin(DatasetSpecification,ClassLoader)} method
- a way to perform operations to manipulate data of the dataset instance (e.g. read, write etc.) by providing implementation of {@link Dataset} via {@link #getDataset(DatasetSpecification,Map,ClassLoader)} method
@param < D> defines data operations that can be performed on this dataset instance @param < A> defines administrative operations that can be performed on this dataset instance


  private Map<String, DatasetDefinition> datasetTypes = Maps.newHashMap();


  @Override
  public <T extends DatasetDefinition> T get(String datasetType) {
    DatasetDefinition def = datasetTypes.get(datasetType);
    if (def == null) {
      String msg = "Requested dataset type does NOT exist: " + datasetType;
      LOG.debug(msg);
      throw new IllegalArgumentException(msg);
    }

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    if (instances.get(datasetInstanceName) != null) {
      throw new InstanceConflictException("Dataset instance with name already exists: " + datasetInstanceName);
    }


    Preconditions.checkArgument(registry.hasType(datasetType), "Dataset type '%s' is not registered", datasetType);
    DatasetDefinition def = registry.get(datasetType);
    DatasetSpecification spec = def.configure(datasetInstanceName, props);
    instances.put(datasetInstanceName, spec);
    def.getAdmin(spec, null).create();
    instances.put(datasetInstanceName, spec);
    LOG.info("Created dataset {} of type {}", datasetInstanceName, datasetType);
  }

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    if (oldSpec == null) {
      throw new InstanceConflictException("Dataset instance with name does not exist: " + datasetInstanceName);
    }
    String datasetType = oldSpec.getType();
    Preconditions.checkArgument(registry.hasType(datasetType), "Dataset type '%s' is not registered", datasetType);
    DatasetDefinition def = registry.get(datasetType);
    DatasetSpecification spec = def.configure(datasetInstanceName, props);
    instances.put(datasetInstanceName, spec);
    def.getAdmin(spec, null).upgrade();
  }

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  }


  @Override
  public synchronized void deleteInstance(String datasetInstanceName) throws InstanceConflictException, IOException {
    DatasetSpecification spec = instances.remove(datasetInstanceName);
    DatasetDefinition def = registry.get(spec.getType());
    def.getAdmin(spec, null).drop();
  }

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  }


  @Override
  public synchronized void deleteAllInstances() throws DatasetManagementException, IOException {
    for (DatasetSpecification spec : instances.values()) {
      DatasetDefinition def = registry.get(spec.getType());
      def.getAdmin(spec, null).drop();
    }
    instances.clear();
  }

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    DatasetSpecification spec = instances.get(datasetInstanceName);
    if (spec == null) {
      return null;
    }
    DatasetDefinition impl = createRegistry(classLoader).get(spec.getType());
    return (T) impl.getAdmin(spec, classLoader);
  }

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    DatasetSpecification spec = instances.get(datasetInstanceName);
    if (spec == null) {
      return null;
    }
    DatasetDefinition def = createRegistry(classLoader).get(spec.getType());
    return (T) (def.getDataset(spec, arguments, classLoader));
  }

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          String type = ((EmbeddedDataset) ann).type();
          if (EmbeddedDataset.DEFAULT_TYPE_NAME.equals(type)) {
            // default to dataset class name
            type = paramTypes[i].getName();
          }
          DatasetDefinition def = registry.get(type);
          if (def == null) {
            String msg = String.format("Unknown data set type used with @Dataset: " + type);
            LOG.error(msg);
            throw new IllegalStateException(msg);
          }

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Related Classes of co.cask.cdap.api.dataset.DatasetDefinition

co.cask.cdap.data2.dataset2.InMemoryDatasetDefinitionRegistry

co.cask.cdap.data2.dataset2.InMemoryDatasetFramework

co.cask.cdap.data2.dataset2.SingleTypeModule

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