private void CreateAggregator(Configuration conf)
{
if (theAggregatorDescriptor == null)
{
theAggregatorDescriptor = (ValueAggregatorDescriptor)CreateInstance(this.className
);
theAggregatorDescriptor.Configure(conf);
}
}
protected internal static AList <ValueAggregatorDescriptor> GetAggregatorDescriptors
(Configuration conf)
{
int num = conf.GetInt(DescriptorNum, 0);
AList <ValueAggregatorDescriptor> retv = new AList <ValueAggregatorDescriptor>(num);
for (int i = 0; i < num; i++)
{
string spec = conf.Get(Descriptor + "." + i);
ValueAggregatorDescriptor ad = GetValueAggregatorDescriptor(spec, conf);
if (ad != null)
{
retv.AddItem(ad);
}
}
return(retv);
}
/// <summary>the map function.</summary>
/// <remarks>
/// the map function. It iterates through the value aggregator descriptor
/// list to generate aggregation id/value pairs and emit them.
/// </remarks>
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
protected internal override void Map(K1 key, V1 value, Mapper.Context context)
{
IEnumerator <object> iter = ValueAggregatorJobBase.aggregatorDescriptorList.GetEnumerator
();
while (iter.HasNext())
{
ValueAggregatorDescriptor ad = (ValueAggregatorDescriptor)iter.Next();
IEnumerator <KeyValuePair <Text, Text> > ens = ad.GenerateKeyValPairs(key, value).GetEnumerator
();
while (ens.HasNext())
{
KeyValuePair <Text, Text> en = ens.Next();
context.Write(en.Key, en.Value);
}
}
}
