org.filesys.oncrpc.nfs.nio.NIORpcThreadRequest Maven / Gradle / Ivy
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/*
* Copyright (C) 2020 GK Spencer
*
* JFileServer is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* JFileServer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with JFileServer. If not, see Holds the details of an NIO channel based NFS session request for processing by a thread pool.
*
* @author gkspencer
*/
public class NIORpcThreadRequest implements ThreadRequest {
// Maximum packets to run per thread run
private static final int MaxPacketsPerRun = 4;
// NFS session
private NFSSrvSession m_sess;
// Selection key for this socket channel
private SelectionKey m_selectionKey;
/**
* Class constructor
*
* @param sess NFSSrvSession
* @param selKey SelectionKey
*/
public NIORpcThreadRequest(NFSSrvSession sess, SelectionKey selKey) {
m_sess = sess;
m_selectionKey = selKey;
}
/**
* Run the SMB request
*/
public void runRequest() {
// Check if the session is still alive
if (m_sess.isShutdown() == false) {
// Read one or more packets from the socket for this session
int pktCount = 0;
boolean morePkts = true;
boolean pktError = false;
RpcPacket rpcPkt = null;
RpcPacket rpcResponse = null;
while (pktCount < MaxPacketsPerRun && morePkts == true && pktError == false) {
try {
// Get the packet handler and read in the RPC request
RpcPacketHandler pktHandler = m_sess.getPacketHandler();
if ( pktHandler != null)
rpcPkt = pktHandler.receiveRpc();
else {
rpcPkt = null;
morePkts = false;
continue;
}
// If the request packet is not valid then close the session
if (rpcPkt == null) {
// If we have not processed any packets in this run it is an error
if (pktCount == 0) {
// DEBUG
if (Debug.EnableInfo && m_sess.hasDebug(NFSSrvSession.Dbg.SOCKET))
Debug.println("Received null packet, closing session sess=" + m_sess.getUniqueId() + ", addr=" + m_sess.getRemoteAddress().getHostAddress());
// Close the session
m_sess.closeSession();
// Cancel the selection key
m_selectionKey.cancel();
m_selectionKey.selector().wakeup();
// Indicate socket/packet error
pktError = true;
}
// No more packets available
morePkts = false;
}
else {
// Update the count of packets processed
pktCount++;
// If this is the last packet before we hit the maximum packets per thread then re-enable read events
// for this socket channel
if (pktCount == MaxPacketsPerRun) {
m_selectionKey.interestOps(m_selectionKey.interestOps() | SelectionKey.OP_READ);
m_selectionKey.selector().wakeup();
}
// Set the RPC client address/port
rpcPkt.setClientDetails( m_sess.getRemoteAddress(), m_sess.getRemotePort(), Rpc.ProtocolId.TCP);
// Process the RPC request
rpcResponse = m_sess.getNFSServer().processRpc(rpcPkt);
if ( rpcResponse != null)
m_sess.getPacketHandler().sendRpcResponse( rpcResponse);
// Release the RPC packet back to the pool
m_sess.getNFSServer().getPacketPool().releasePacket( rpcPkt);
// Release the response packet
if ( rpcPkt.hasAssociatedPacket() && rpcPkt.getAssociatedPacket().isAllocatedFromPool())
m_sess.getNFSServer().getPacketPool().releasePacket( rpcPkt.getAssociatedPacket());
rpcPkt = null;
rpcResponse = null;
}
}
catch (Throwable ex) {
// DEBUG
if (Debug.EnableInfo && m_sess.hasDebug(NFSSrvSession.Dbg.SOCKET)) {
Debug.println("Error during packet receive, closing session sess=" + m_sess.getUniqueId() + ", addr=" + m_sess.getRemoteAddress() + "/" +
m_sess.getRemotePort() + " ex=" + ex.getMessage());
Debug.println(ex);
}
// Close the session
m_sess.closeSession();
// Cancel the selection key
m_selectionKey.cancel();
m_selectionKey.selector().wakeup();
// Indicate socket/packet error
pktError = true;
}
finally {
// Make sure the request packet is returned to the pool
if (rpcPkt != null && rpcPkt.isAllocatedFromPool())
m_sess.getNFSServer().getPacketPool().releasePacket(rpcPkt);
// Release the response packet, if valid
if ( rpcPkt != null && rpcPkt.hasAssociatedPacket() && rpcPkt.getAssociatedPacket().isAllocatedFromPool())
m_sess.getNFSServer().getPacketPool().releasePacket( rpcPkt.getAssociatedPacket());
}
}
// Re-enable read events for this socket channel, if there were no errors
if (pktError == false && pktCount < MaxPacketsPerRun) {
// Re-enable read events for this socket channel
m_selectionKey.interestOps(m_selectionKey.interestOps() | SelectionKey.OP_READ);
m_selectionKey.selector().wakeup();
}
// DEBUG
if (Debug.EnableInfo && m_sess.hasDebug(NFSSrvSession.Dbg.THREADPOOL) && pktCount > 1)
Debug.println("Processed " + pktCount + " packets for addr=" + m_sess.getRemoteAddress().getHostAddress() + " in one thread run (max=" + MaxPacketsPerRun + ")");
}
}
/**
* Return the NFS request details as a string
*
* @return String
*/
public String toString() {
StringBuilder str = new StringBuilder();
str.append("[NIO NFS Sess=");
str.append(m_sess.getUniqueId());
str.append("]");
return str.toString();
}
}