@SuppressWarnings("unchecked")
@Override
public void map(LongWritable positionToMap, LongWritable record, Context context) {
try {
S pos = game.hashToState(positionToMap.get());
game.longToRecord(pos, record.get(), rec);
rec.previousPosition();
int numParents = 0;
numParents = ((Undoable<S>) game).possibleParents(pos, parentStates);
for (int i = 0; i < numParents; i++) {
long parentHash = game.stateToHash(parentStates[i]);
RangeFile parentFile = rangeFiles.getFile(parentHash);
srp.state = parentHash;
srp.record = game.recordToLong(parentStates[i], rec);
context.write(parentFile, new StateRecordPair(srp.state, srp.record));
}
} catch (IOException e) {
throw new Error(e);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
@Override
public void setup(Context context) {
try {
org.apache.hadoop.conf.Configuration hadoopConf = context.getConfiguration();
conf = Configuration.deserialize(hadoopConf.get("gamesman.configuration"));
game = conf.getCheckedGame();
if (game instanceof Undoable<?>) {
parentStates = game.newStateArray(((Undoable<?>) game).maxParents());
}
fs = FileSystem.get(hadoopConf);
rec = new Record(conf);
srp = new StateRecordPair();
rangeFiles = new RangeFileManager<S>(fs, hadoopConf, game);
} catch (IOException e) {
throw new Error(e);
} catch (ClassNotFoundException e) {
throw new Error(e);
} catch (ClassCastException e) {
throw new Error("Game is not Undoable");
}
}
public static DatabaseArgs getArgs(
String uri, Configuration conf, boolean reading, boolean writing) {
Game<?> g = conf.getGame();
return getArgs(uri, conf, 0, g.numHashes(), reading, writing);
}