CfsCommandPostprocessor (Yamcs :: Core 5.3.2 API)

java.lang.Object
- org.yamcs.tctm.cfs.CfsCommandPostprocessor

All Implemented Interfaces:

CommandPostprocessor
```
public class CfsCommandPostprocessor
extends Object
implements CommandPostprocessor
```
CFS TC packets:
- CCSDS primary header - 6 bytes. Should be set according to CCSDS 133.0-B.
- function code - 1 byte
- checksum - 1 byte
The checksum is an XOR of all bytes from the packet with the initial checksum set to 0.
This class sets the CCSDS sequence count and packet length in the primary CCSDS header and the checksum in the secondary CCSDS header.
The other parts of the header/packet are expected to be set by the command composition according to the Mission Database.
Note that prior to this patch the cFS would expect the checksum and the function code swapped on little endian systems. The configuration option swapChecksumFc can be used to realize this behaviour:
```
  dataLinks: 
  ...
       commandPostprocessorClassName: org.yamcs.tctm.cfs.CfsCommandPostprocessor
       commandPostprocessorArgs:
           swapChecksumFc: true

 
```

Field Summary

Fields
Modifier and Type Field Description

protected CommandHistoryPublisher commandHistoryPublisher

protected CcsdsSeqCountFiller seqFiller

Constructor Summary

Constructors
Constructor Description

CfsCommandPostprocessor(String yamcsInstance)

CfsCommandPostprocessor(String yamcsInstance, YConfiguration config)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`byte[]`	`process(PreparedCommand pc)`	processes the command and returns the binary buffer.
`void`	`setCommandHistoryPublisher(CommandHistoryPublisher commandHistoryListener)`	sets the command history listener which can be used by the preprocessor to provide command history entries related to the command processed

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.yamcs.tctm.CommandPostprocessor
getBinaryLength

- Field Detail
  - seqFiller
```
protected CcsdsSeqCountFiller seqFiller
```
  - commandHistoryPublisher
```
protected CommandHistoryPublisher commandHistoryPublisher
```
- Constructor Detail
  - CfsCommandPostprocessor
```
public CfsCommandPostprocessor(String yamcsInstance)
```
  - CfsCommandPostprocessor
```
public CfsCommandPostprocessor(String yamcsInstance,
                               YConfiguration config)
```
- Method Detail
  - process
```
public byte[] process(PreparedCommand pc)
```
    Description copied from interface: CommandPostprocessor
    
    processes the command and returns the binary buffer. Returns null if the command cannot be processed (e.g. its size does not correspond to what this processor expects). In this case the postprocessor is expected to fail the command in the command history (also filling in an appropiate reason)
    
    Specified by:
    
    process in interface CommandPostprocessor
    
    Returns:
  - setCommandHistoryPublisher
```
public void setCommandHistoryPublisher(CommandHistoryPublisher commandHistoryListener)
```
    Description copied from interface: CommandPostprocessor
    
    sets the command history listener which can be used by the preprocessor to provide command history entries related to the command processed
    
    Specified by:
    
    setCommandHistoryPublisher in interface CommandPostprocessor