Package com.cosylab.epics.caj.cas.handlers

Class AbstractCASResponseHandler

java.lang.Object

com.cosylab.epics.caj.impl.handlers.AbstractCAResponseHandler

com.cosylab.epics.caj.cas.handlers.AbstractCASResponseHandler

All Implemented Interfaces:

ResponseHandler

Direct Known Subclasses:

BadResponse, ClearChannelResponse, CreateChannelResponse, EchoResponse, EventAddResponse, EventCancelResponse, EventsOffResponse, EventsOnResponse, HostnameResponse, NoopResponse, ReadNotifyResponse, SearchResponse, UsernameResponse, VersionResponse, WriteNotifyResponse, WriteResponse

public abstract class AbstractCASResponseHandler
extends AbstractCAResponseHandler

Version:

$id$

Author:

Matej Sekoranja

Field Summary

Fields

Modifier and Type	Field	Description
protected CAJServerContext	context	Context instance.

Fields inherited from class com.cosylab.epics.caj.impl.handlers.AbstractCAResponseHandler

command, dataCount, dataType, debug, description, parameter1, parameter2, payloadSize

Constructor Summary

Constructors

Constructor	Description
AbstractCASResponseHandler(CAJServerContext context, String description)

Method Summary

Modifier and Type	Method	Description
static DBR	createDBRforReading(ProcessVariable processVariable)	Create appropriate DBR structure for reading (of PV type).
static DBR	createDBRforReading(ProcessVariable processVariable, int dataCount)	Create appropriate DBR structure for reading (of PV type).
static DBR	createDBRforReading(ProcessVariable processVariable, short dataType, int dataCount)	Create appropriate DBR structure for reading (of PV type).
static String	extractString(ByteBuffer buffer, int start, int maxSize, boolean setToEnd)	Extract string from payload.
protected void	sendException(Transport transport, int cid, CAStatus errorStatus, ByteBuffer previousHeader, String message)	Send error (exception) response.

Methods inherited from class com.cosylab.epics.caj.impl.handlers.AbstractCAResponseHandler

handleResponse, internalHandleResponse, parseHeader

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

context

protected CAJServerContext context

Context instance.

Constructor Detail

AbstractCASResponseHandler

public AbstractCASResponseHandler(CAJServerContext context,
                                  String description)

Parameters:

context -

description -

Method Detail

extractString

public static final String extractString(ByteBuffer buffer,
                                         int start,
                                         int maxSize,
                                         boolean setToEnd)

Extract string from payload.

Parameters:

buffer - buffer to use.

start - buffer offset to use, if negative current buffer position will be used

maxSize - maximum payload size reserved for string.

setToEnd - set to the end of string flag (after zero char)

Returns:

extracted string.

sendException

protected void sendException(Transport transport,
                             int cid,
                             CAStatus errorStatus,
                             ByteBuffer previousHeader,
                             String message)

Send error (exception) response.

Parameters:

transport - transport to use.

cid - channel ID.

errorStatus - error status.

previousHeader - header of the request messages causing this error.

message - string message, can be null.

createDBRforReading

public static final DBR createDBRforReading(ProcessVariable processVariable)

Create appropriate DBR structure for reading (of PV type). Returned DBR structure will be the most complete one (CTRL usually)., PV array length.

Parameters:

processVariable - process variable to be read.

Returns:

requested DBR.

createDBRforReading

public static final DBR createDBRforReading(ProcessVariable processVariable,
                                            int dataCount)

Create appropriate DBR structure for reading (of PV type). Returned DBR structure will be the most complete one (CTRL usually).

Parameters:

processVariable - process variable to be read.

dataCount - requested data count (returned DBR will have this count).

Returns:

requested DBR.

createDBRforReading

public static final DBR createDBRforReading(ProcessVariable processVariable,
                                            short dataType,
                                            int dataCount)

Create appropriate DBR structure for reading (of PV type).

Parameters:

processVariable - process variable to be read.

dataType - data type requested from client (not necessary equals to PV type)

dataCount - requested data count (returned DBR will have this count).

Returns:

requested DBR.