Package com.alibaba.graphscope.context

Interface DefaultContextBase<OID_T,VID_T,VDATA_T,EDATA_T>

Type Parameters:

OID_T - Original vertex id type

VID_T - inner vertex id type

VDATA_T - Vertex data type

EDATA_T - edge data type

All Superinterfaces:

ContextBase

All Known Implementing Classes:

GiraphComputationAdaptorContext

public interface DefaultContextBase<OID_T,VID_T,VDATA_T,EDATA_T>
extends ContextBase

DefaultContextBase is the base class for user-defined contexts for sequential apps. A context manages data through the whole computation. The data won't be cleared during supersteps.

Apart from data structures provided by java.lang, you can also use java wrappers for grape data structures provided com.alibaba.graphscope.ds and com.alibaba.graphscope.stdcxx.

Method Summary

Modifier and Type	Method	Description
void	Init(IFragment<OID_T,VID_T,VDATA_T,EDATA_T> frag, DefaultMessageManager messageManager, com.alibaba.fastjson.JSONObject jsonObject)	Called by grape framework, before any PEval.
void	Output(IFragment<OID_T,VID_T,VDATA_T,EDATA_T> frag)	Output will be executed when the computations finalizes.

Method Detail

Init

void Init(IFragment<OID_T,VID_T,VDATA_T,EDATA_T> frag,
          DefaultMessageManager messageManager,
          com.alibaba.fastjson.JSONObject jsonObject)

Called by grape framework, before any PEval. You can initiating data structures need during super steps here.

Parameters:

frag - The graph fragment providing accesses to graph data.

messageManager - The message manger which manages messages between fragments.

jsonObject - String args from cmdline.

See Also:

IFragment, DefaultMessageManager, JSONObject

Output

void Output(IFragment<OID_T,VID_T,VDATA_T,EDATA_T> frag)

Output will be executed when the computations finalizes. Data maintained in this context shall be outputted here.

Parameters:

frag - The graph fragment contains the graph info.

See Also:

IFragment