ParallelContextBase (Grape Java SDK 0.27.0 API)

Type Parameters:

OID_T - original id type

VID_T - vertex id type

VDATA_T - vertex data type

EDATA_T - edge data type

All Superinterfaces:

ContextBase

All Known Implementing Classes:

BFSContext, GraphXParallelAdaptorContext, PageRankContext, SSSPContext, StringAppContext, TraverseContext, WCCContext
```
public interface ParallelContextBase<OID_T,VID_T,VDATA_T,EDATA_T>
extends ContextBase
```
ParallelContextBase is the base class for user-defined contexts for parallel 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

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`Init(IFragment<OID_T,VID_T,VDATA_T,EDATA_T> frag, ParallelMessageManager 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,
          ParallelMessageManager 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, ParallelMessageManager, 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