/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override void Run(Mapper.Context context)
{
Setup(context);
int numMappers = chain.GetAllMappers().Count;
if (numMappers == 0)
{
return;
}
Chain.ChainBlockingQueue <Chain.KeyValuePair <object, object> > inputqueue;
Chain.ChainBlockingQueue <Chain.KeyValuePair <object, object> > outputqueue;
if (numMappers == 1)
{
chain.RunMapper(context, 0);
}
else
{
// add all the mappers with proper context
// add first mapper
outputqueue = chain.CreateBlockingQueue();
chain.AddMapper(context, outputqueue, 0);
// add other mappers
for (int i = 1; i < numMappers - 1; i++)
{
inputqueue = outputqueue;
outputqueue = chain.CreateBlockingQueue();
chain.AddMapper(inputqueue, outputqueue, context, i);
}
// add last mapper
chain.AddMapper(outputqueue, context, numMappers - 1);
}
// start all threads
chain.StartAllThreads();
// wait for all threads
chain.JoinAllThreads();
}
/// <exception cref="System.IO.IOException"/>
/// <exception cref="System.Exception"/>
public override void Run(Reducer.Context context)
{
Setup(context);
// if no reducer is set, just do nothing
if (chain.GetReducer() == null)
{
return;
}
int numMappers = chain.GetAllMappers().Count;
// if there are no mappers in chain, run the reducer
if (numMappers == 0)
{
chain.RunReducer(context);
return;
}
// add reducer and all mappers with proper context
Chain.ChainBlockingQueue <Chain.KeyValuePair <object, object> > inputqueue;
Chain.ChainBlockingQueue <Chain.KeyValuePair <object, object> > outputqueue;
// add reducer
outputqueue = chain.CreateBlockingQueue();
chain.AddReducer(context, outputqueue);
// add all mappers except last one
for (int i = 0; i < numMappers - 1; i++)
{
inputqueue = outputqueue;
outputqueue = chain.CreateBlockingQueue();
chain.AddMapper(inputqueue, outputqueue, context, i);
}
// add last mapper
chain.AddMapper(outputqueue, context, numMappers - 1);
// start all threads
chain.StartAllThreads();
// wait for all threads
chain.JoinAllThreads();
}