/**
* Append some vertices to an out-of-core partition.
*
* @param partitionId Id of the destination partition
* @param vertices Vertices to be added
* @throws IOException
*/
private void appendVertices(Integer partitionId, Collection<Vertex<I, V, E, M>> vertices)
throws IOException {
File file = new File(getPartitionPath(partitionId));
DataOutputStream outputStream =
new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file, true)));
for (Vertex<I, V, E, M> vertex : vertices) {
vertex.write(outputStream);
}
outputStream.close();
}
/**
* Write a partition to disk.
*
* @param partition The partition object to write
* @throws java.io.IOException
*/
private void writePartition(Partition<I, V, E, M> partition) throws IOException {
File file = new File(getPartitionPath(partition.getId()));
file.getParentFile().mkdirs();
file.createNewFile();
DataOutputStream outputStream =
new DataOutputStream(new BufferedOutputStream(new FileOutputStream(file)));
for (Vertex<I, V, E, M> vertex : partition.getVertices()) {
vertex.write(outputStream);
}
outputStream.close();
}