// Determine the system version.
int getSystemVRM() // @B3A @C1c
{
if (!determinedSystemVRM_) {
// The version number is in the high 16 bits of VRM.
// High 16 bits represent version next 8 bits represent release,
// low 8 bits represent modification.
// Thus Version 4, release 5, modification level 0 is 0x00040500.
systemVRM_ = system_.getVRM(); // @B4C
determinedSystemVRM_ = true;
}
return systemVRM_;
}
/**
* Disconnects from the byte stream server.
*
* @exception ConnectionDroppedException If the connection is dropped unexpectedly.
*/
void connectionDropped(
ConnectionDroppedException e) // @B2A - code relocated from IFSFileOutputStreamImplRemote,etc.
throws ConnectionDroppedException {
if (server_ != null) {
system_.disconnectServer(server_);
server_ = null;
try {
close();
} catch (Exception exc) {
} // Note: Not relevant for IFSFileImplRemote.
}
Trace.log(Trace.ERROR, "Byte stream connection lost.");
throw e;
}
/**
* Establishes communications with the server.
*
* @exception AS400SecurityException If a security or authority error occurs.
* @exception IOException If an error occurs while communicating with the server.
*/
void connect() // @B2A - code relocated from IFSFileOutputStreamImplRemote,etc.
throws IOException, AS400SecurityException {
// Connect to the byte stream server if not already connected.
if (server_ == null) {
// Ensure that the system has been set.
if (system_ == null) {
throw new ExtendedIllegalStateException(
"system", ExtendedIllegalStateException.PROPERTY_NOT_SET);
}
try {
server_ = system_.getConnection(AS400.FILE, false);
} catch (AS400SecurityException e) {
Trace.log(
Trace.ERROR,
"Access to byte stream server on '" + system_.getSystemName() + "' denied.",
e);
throw e;
}
// Exchange attributes with the server.
exchangeServerAttributes();
}
}
/**
* Exchanges server attributes.
*
* @exception IOException If an error occurs while communicating with the server.
*/
void exchangeServerAttributes() // @B2A - code relocated from IFSFileOutputStreamImplRemote,etc.
throws IOException, AS400SecurityException {
synchronized (server_) {
DataStream ds = server_.getExchangeAttrReply();
IFSExchangeAttrRep rep = null;
try {
rep = (IFSExchangeAttrRep) ds;
} catch (ClassCastException e) {
if (ds instanceof IFSReturnCodeRep) {
int rc = ((IFSReturnCodeRep) ds).getReturnCode();
throwSecurityExceptionIfAccessDenied(path_, rc); // check for "access denied"
Trace.log(Trace.ERROR, "IFSReturnCodeRep return code", descriptionForReturnCode(rc));
throw new ExtendedIOException(path_, rc);
} else {
String className = (ds == null ? "null" : ds.getClass().getName());
Trace.log(Trace.ERROR, "Unexpected reply from Exchange Server Attributes: " + className);
throw new InternalErrorException(InternalErrorException.DATA_STREAM_UNKNOWN);
}
}
// Note: For releases after V5R4, we ask for Datastream Level 16;
// for V5R3 thru V5R4, we ask for Datastream Level 8;
// for V4R5 thru V5R2, we ask for Datastream Level 2;
// for earlier systems, we ask for Datastream Level 0. // @B6c
if (getSystemVRM() >= 0x00060100) requestedDatastreamLevel_ = 16;
else if (getSystemVRM() >= 0x00050300) requestedDatastreamLevel_ = 8;
else if (getSystemVRM() >= 0x00040500) // @B3A @B4C
requestedDatastreamLevel_ = 2;
else requestedDatastreamLevel_ = 0;
if (rep == null) {
ds = null;
try {
int[] preferredCcsids; // @A2A
// Datastream level 8 was introduced in release V5R3.
if (getSystemVRM() >= 0x00050300) { // System is post-V5R2.
preferredCcsids = new int[] {0x04b0, 0x34b0, 0xf200}; // UTF-16, new or old Unicode.
}
// Note: Pre-V4R5 systems hang when presented with multiple
// preferred CCSIDs in the exchange of attributes. @B3A @B4C
else if (getSystemVRM() >= 0x00040500) // @B3A @B4C
{ // System is V4R5 or later. We can present a list of preferred CCSIDs.
preferredCcsids = new int[] {0x34b0, 0xf200}; // New or old Unicode.
} else { // System is pre-V4R5. Exchange attr's the old way.
preferredCcsids = new int[] {0xf200}; // Old Unicode only.
}
// Use GMT date/time, don't use posix style return codes,
// use PC pattern matching semantics,
// maximum data transfer size of 0xffffffff.
ds =
server_.sendExchangeAttrRequest( // @B3A
new IFSExchangeAttrReq(
true,
false,
IFSExchangeAttrReq.PC_PATTERN_MATCH,
0xffffffff,
requestedDatastreamLevel_,
preferredCcsids)); // @A2C
rep = (IFSExchangeAttrRep) ds;
} catch (ConnectionDroppedException e) {
Trace.log(Trace.ERROR, "Byte stream server connection lost");
connectionDropped(e);
} catch (InterruptedException e) {
Trace.log(Trace.ERROR, "Interrupted", e);
system_.disconnectServer(server_);
server_ = null;
throw new InterruptedIOException(e.getMessage());
} catch (IOException e) {
Trace.log(Trace.ERROR, "I/O error during attribute exchange.");
system_.disconnectServer(server_);
server_ = null;
throw e;
} catch (ClassCastException e) {
if (ds instanceof IFSReturnCodeRep) {
int rc = ((IFSReturnCodeRep) ds).getReturnCode();
throwSecurityExceptionIfAccessDenied(path_, rc); // check for "access denied"
Trace.log(Trace.ERROR, "IFSReturnCodeRep return code", descriptionForReturnCode(rc));
throw new ExtendedIOException(path_, rc);
} else {
String className = (ds == null ? "null" : ds.getClass().getName());
Trace.log(
Trace.ERROR, "Unexpected reply from Exchange Server Attributes: " + className);
throw new InternalErrorException(InternalErrorException.DATA_STREAM_UNKNOWN);
}
}
}
// Process the exchange attributes reply.
if (rep != null) {
maxDataBlockSize_ = ((IFSExchangeAttrRep) rep).getMaxDataBlockSize();
preferredServerCCSID_ = rep.getPreferredCCSID();
serverDatastreamLevel_ = rep.getDataStreamLevel();
setConverter(ConverterImplRemote.getConverter(preferredServerCCSID_, system_));
if (DEBUG) {
System.out.println(
"DEBUG: IFSFileDescriptorImplRemote.exchangeServerAttributes(): "
+ "preferredServerCCSID_ == "
+ preferredServerCCSID_);
int[] list = rep.getPreferredCCSIDs();
for (int i = 0; i < list.length; i++)
System.out.println("-- Server's preferred CCSID (#" + i + 1 + "): " + list[i]);
System.out.println(
"-- Server's dataStreamLevel : " + Integer.toHexString(serverDatastreamLevel_));
}
} else {
// Should never happen.
if (rep != null) {
Trace.log(Trace.ERROR, "Unknown reply data stream", rep.data_);
system_.disconnectServer(server_);
server_ = null;
throw new InternalErrorException(
Integer.toHexString(rep.getReqRepID()), InternalErrorException.DATA_STREAM_UNKNOWN);
} else {
Trace.log(Trace.ERROR, "Null reply data stream");
system_.disconnectServer(server_);
server_ = null;
throw new InternalErrorException(InternalErrorException.DATA_STREAM_UNKNOWN);
}
}
}
}
