package storm.trident.state.map;
import storm.trident.state.OpaqueValue;
import storm.trident.state.ValueUpdater;
import java.util.ArrayList;
import java.util.List;
public class OpaqueMap<T> implements MapState<T> {
public static <T> MapState<T> build(IBackingMap<OpaqueValue> backing) {
return new OpaqueMap<T>(backing);
}
CachedBatchReadsMap<OpaqueValue> _backing;
Long _currTx;
protected OpaqueMap(IBackingMap<OpaqueValue> backing) {
_backing = new CachedBatchReadsMap(backing);
}
@Override
public List<T> multiGet(List<List<Object>> keys) {
List<CachedBatchReadsMap.RetVal<OpaqueValue>> curr = _backing.multiGet(keys);
List<T> ret = new ArrayList<T>(curr.size());
for(CachedBatchReadsMap.RetVal<OpaqueValue> retval: curr) {
OpaqueValue val = retval.val;
if(val!=null) {
if(retval.cached) {
ret.add((T) val.getCurr());
} else {
ret.add((T) val.get(_currTx));
}
} else {
ret.add(null);
}
}
return ret;
}
@Override
public List<T> multiUpdate(List<List<Object>> keys, List<ValueUpdater> updaters) {
List<CachedBatchReadsMap.RetVal<OpaqueValue>> curr = _backing.multiGet(keys);
List<OpaqueValue> newVals = new ArrayList<OpaqueValue>(curr.size());
List<T> ret = new ArrayList<T>();
for(int i=0; i<curr.size(); i++) {
CachedBatchReadsMap.RetVal<OpaqueValue> retval = curr.get(i);
OpaqueValue<T> val = retval.val;
ValueUpdater<T> updater = updaters.get(i);
T prev;
if(val==null) {
prev = null;
} else {
if(retval.cached) {
prev = val.getCurr();
} else {
prev = val.get(_currTx);
}
}
T newVal = updater.update(prev);
ret.add(newVal);
OpaqueValue<T> newOpaqueVal;
if(val==null) {
newOpaqueVal = new OpaqueValue<T>(_currTx, newVal);
} else {
newOpaqueVal = val.update(_currTx, newVal);
}
newVals.add(newOpaqueVal);
}
_backing.multiPut(keys, newVals);
return ret;
}
@Override
public void multiPut(List<List<Object>> keys, List<T> vals) {
List<ValueUpdater> updaters = new ArrayList<ValueUpdater>(vals.size());
for(T val: vals) {
updaters.add(new ReplaceUpdater<T>(val));
}
multiUpdate(keys, updaters);
}
@Override
public void beginCommit(Long txid) {
_currTx = txid;
_backing.reset();
}
@Override
public void commit(Long txid) {
_currTx = null;
_backing.reset();
}
static class ReplaceUpdater<T> implements ValueUpdater<T> {
T _t;
public ReplaceUpdater(T t) {
_t = t;
}
@Override
public T update(Object stored) {
return _t;
}
}
}