How to use

SystemTableBackup

in

com.moz.fiji.schema.avro

/** {@inheritDoc} */
@Override
public void fromBackup(SystemTableBackup backup) throws IOException {
 final State state = mState.get();
 Preconditions.checkState(state == State.OPEN,
   "Cannot restore backup to SystemTable instance in state %s.", state);
 LOG.info(String.format("Restoring system table from backup with %d entries.",
   backup.getEntries().size()));
 for (SystemTableEntry entry : backup.getEntries()) {
  putValue(entry.getKey(), entry.getValue().array());
 }
 // TODO: Flush?
 //mTable.flushCommits();
}

/** {@inheritDoc} */
@Override
public SystemTableBackup toBackup() throws IOException {
 final State state = mState.get();
 Preconditions.checkState(state == State.OPEN,
   "Cannot backup SystemTable instance in state %s.", state);
 ArrayList<SystemTableEntry> backupEntries = new ArrayList<SystemTableEntry>();
 CloseableIterable<SimpleEntry<String, byte[]>> entries = getAll();
 for (SimpleEntry<String, byte[]> entry : entries) {
  backupEntries.add(SystemTableEntry.newBuilder()
    .setKey(entry.getKey())
    .setValue(ByteBuffer.wrap(entry.getValue()))
    .build());
 }
 return SystemTableBackup.newBuilder().setEntries(backupEntries).build();
}

/** {@inheritDoc} */
@Override
public SystemTableBackup toBackup() throws IOException {
 final State state = mState.get();
 Preconditions.checkState(state == State.OPEN,
   "Cannot backup SystemTable instance in state %s.", state);
 ArrayList<SystemTableEntry> backupEntries = new ArrayList<SystemTableEntry>();
 CloseableIterable<SimpleEntry<String, byte[]>> entries = getAll();
 for (SimpleEntry<String, byte[]> entry : entries) {
  backupEntries.add(SystemTableEntry.newBuilder()
    .setKey(entry.getKey())
    .setValue(ByteBuffer.wrap(entry.getValue()))
    .build());
 }
 return SystemTableBackup.newBuilder().setEntries(backupEntries).build();
}

/** {@inheritDoc} */
@Override
public void fromBackup(SystemTableBackup backup) throws IOException {
 final State state = mState.get();
 Preconditions.checkState(state == State.OPEN,
   "Cannot restore backup to SystemTable instance in state %s.", state);
 LOG.info(String.format("Restoring system table from backup with %d entries.",
   backup.getEntries().size()));
 for (SystemTableEntry entry : backup.getEntries()) {
  putValue(entry.getKey(), entry.getValue().array());
 }
 mTable.flushCommits();
}

 /**
  * Restores all SystemTable entries from the backup.
  *
  * @param backup the deserialized backup of the metadata.
  * @param fiji the connected Fiji instance.
  * @throws IOException if there is an error communicating with HBase.
  */
 public void restoreSystemVars(MetadataBackup backup, Fiji fiji) throws IOException {
  // Restore all System table entries from the file.
  final FijiSystemTable systemTable = fiji.getSystemTable();
  LOG.info("Restoring system table entries...");
  systemTable.fromBackup(backup.getSystemTable());
  LOG.info(String.format("Restored %d entries.", backup.getSystemTable().getEntries().size()));
 }
}

 /**
  * Restores all SystemTable entries from the backup.
  *
  * @param backup the deserialized backup of the metadata.
  * @param fiji the connected Fiji instance.
  * @throws java.io.IOException if there is an error communicating with HBase.
  */
 public void restoreSystemVars(MetadataBackup backup, Fiji fiji) throws IOException {
  // Restore all System table entries from the file.
  final FijiSystemTable systemTable = fiji.getSystemTable();
  LOG.info("Restoring system table entries...");
  systemTable.fromBackup(backup.getSystemTable());
  LOG.info(String.format("Restored %d entries.", backup.getSystemTable().getEntries().size()));
 }
}