/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
private bool ReadFromQueue()
{
Chain.KeyValuePair <KEYIN, VALUEIN> kv = null;
// wait for input on queue
kv = inputQueue.Dequeue();
if (kv.endOfInput)
{
return(false);
}
key = (KEYIN)ReflectionUtils.NewInstance(keyClass, conf);
value = (VALUEIN)ReflectionUtils.NewInstance(valueClass, conf);
ReflectionUtils.Copy(conf, kv.key, this.key);
ReflectionUtils.Copy(conf, kv.value, this.value);
return(true);
}
/// <summary>Advance to the next key, value pair, returning null if at end.</summary>
/// <returns>the key object that was read into, or null if no more</returns>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override bool NextKeyValue()
{
if (inputQueue != null)
{
return(ReadFromQueue());
}
else
{
if (inputContext.NextKeyValue())
{
this.key = inputContext.GetCurrentKey();
this.value = inputContext.GetCurrentValue();
return(true);
}
else
{
return(false);
}
}
}
/// <summary>Advance to the next key/value pair.</summary>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override bool NextKeyValue()
{
if (!hasMore)
{
key = null;
value = null;
return(false);
}
firstValue = !nextKeyIsSame;
DataInputBuffer nextKey = input.GetKey();
currentRawKey.Set(nextKey.GetData(), nextKey.GetPosition(), nextKey.GetLength() -
nextKey.GetPosition());
buffer.Reset(currentRawKey.GetBytes(), 0, currentRawKey.GetLength());
key = keyDeserializer.Deserialize(key);
DataInputBuffer nextVal = input.GetValue();
buffer.Reset(nextVal.GetData(), nextVal.GetPosition(), nextVal.GetLength() - nextVal
.GetPosition());
value = valueDeserializer.Deserialize(value);
currentKeyLength = nextKey.GetLength() - nextKey.GetPosition();
currentValueLength = nextVal.GetLength() - nextVal.GetPosition();
if (isMarked)
{
backupStore.Write(nextKey, nextVal);
}
hasMore = input.Next();
if (hasMore)
{
nextKey = input.GetKey();
nextKeyIsSame = comparator.Compare(currentRawKey.GetBytes(), 0, currentRawKey.GetLength
(), nextKey.GetData(), nextKey.GetPosition(), nextKey.GetLength() - nextKey.GetPosition
()) == 0;
}
else
{
nextKeyIsSame = false;
}
inputValueCounter.Increment(1);
return(true);
}
// NOTHING
/// <summary>Called once for each key/value pair in the input split.</summary>
/// <remarks>
/// Called once for each key/value pair in the input split. Most applications
/// should override this, but the default is the identity function.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
protected internal virtual void Map(KEYIN key, VALUEIN value, Mapper.Context context
)
{
context.Write((KEYOUT)key, (VALUEOUT)value);
}
