Examples of co.cask.cdap.data.dataset.DataSetInstantiator

co.cask.cdap.data.dataset.DataSetInstantiator
The data set instantiator creates instances of data sets at runtime. It must be called from the execution context to get operational instances of data sets. Given a list of data set specs and a data fabric runtime it can construct an instance of a data set and inject the data fabric runtime into its base tables (and other built-in data sets). The instantiation and injection uses Java reflection a lot. This may look unclean, but it helps us keep the DataSet API clean and simple: no need to pass in data fabric runtime; no exposure of developers to the raw data fabric; and developers only interact with Datasets.

    try {
      File tempDir = tempFolder.newFolder();
      BundleJarUtil.unpackProgramJar(deployedJar, tempDir);
      ProgramClassLoader classLoader = ClassLoaders.newProgramClassLoader
        (tempDir, ApiResourceListHolder.getResourceList(), this.getClass().getClassLoader());
      this.dataSetInstantiator = new DataSetInstantiator(datasetFramework, configuration,
                                                         new DataSetClassLoader(classLoader),
                                                         // todo: collect metrics for datasets outside programs too
                                                         null, null);
    } catch (IOException e) {
      throw Throwables.propagate(e);

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    } else {
      this.programMetrics = null;
      datasetMetrics = null;
    }


    this.dsInstantiator = new DataSetInstantiator(dsFramework, conf, program.getClassLoader(),
                                                  datasetMetrics, programMetrics);


    // todo: this should be instantiated on demand, at run-time dynamically. Esp. bad to do that in ctor...
    // todo: initialized datasets should be managed by DatasetContext (ie. DatasetInstantiator): refactor further
    this.datasets = DataSets.createDataSets(dsInstantiator, datasets);

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Related Classes of co.cask.cdap.data.dataset.DataSetInstantiator

co.cask.cdap.data2.datafabric.DefaultDatasetNamespace

co.cask.cdap.data2.dataset2.NamespacedDatasetFramework

co.cask.cdap.internal.app.runtime.AbstractContext

co.cask.cdap.test.internal.DefaultApplicationManager

co.cask.cdap.api.data.DataSetInstantiationException

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