@Override
public Dataset create(String name, DatasetDescriptor descriptor) {
Preconditions.checkArgument(name != null, "Name can not be null");
Preconditions.checkArgument(descriptor != null, "Descriptor can not be null");
Schema schema = descriptor.getSchema();
Path datasetPath = pathForDataset(name);
try {
if (fileSystem.exists(datasetPath)) {
throw new DatasetRepositoryException("Attempt to create an existing dataset:" + name);
}
} catch (IOException e) {
throw new DatasetRepositoryException(
"Internal error while determining if dataset path already exists:" + datasetPath, e);
}
logger.debug(
"Creating dataset:{} schema:{} datasetPath:{}", new Object[] {name, schema, datasetPath});
try {
if (!fileSystem.mkdirs(datasetPath)) {
throw new DatasetRepositoryException("Failed to make dataset path:" + datasetPath);
}
} catch (IOException e) {
throw new DatasetRepositoryException(
"Internal failure while creating dataset path:" + datasetPath, e);
}
metadataProvider.save(name, descriptor);
return new FileSystemDataset.Builder()
.name(name)
.fileSystem(fileSystem)
.descriptor(descriptor)
.directory(pathForDataset(name))
.partitionKey(descriptor.isPartitioned() ? Accessor.getDefault().newPartitionKey() : null)
.get();
}
@Override
public Dataset get(String name) {
Preconditions.checkArgument(name != null, "Name can not be null");
logger.debug("Loading dataset:{}", name);
Path datasetDirectory = pathForDataset(name);
DatasetDescriptor descriptor = metadataProvider.load(name);
FileSystemDataset ds =
new FileSystemDataset.Builder()
.fileSystem(fileSystem)
.descriptor(descriptor)
.directory(datasetDirectory)
.name(name)
.get();
logger.debug("Loaded dataset:{}", ds);
return ds;
}
@Override
public boolean drop(String name) {
Preconditions.checkArgument(name != null, "Name can not be null");
logger.debug("Dropping dataset:{}", name);
Path datasetPath = pathForDataset(name);
try {
if (metadataProvider.delete(name) && fileSystem.exists(datasetPath)) {
if (fileSystem.delete(datasetPath, true)) {
return true;
} else {
throw new DatasetRepositoryException(
"Failed to delete dataset name:" + name + " data path:" + datasetPath);
}
} else {
return false;
}
} catch (IOException e) {
throw new DatasetRepositoryException(
"Internal failure to test if dataset path exists:" + datasetPath);
}
}
