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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2001-2002
* Sleepycat Software. All rights reserved.
*
* $Id: RpcDbEnv.java,v 1.6 2002/08/23 08:45:59 mjc Exp $
*/
package com.sleepycat.db.rpcserver;
import com.sleepycat.db.*;
import java.io.IOException;
import java.io.*;
import java.util.*;
/**
* RPC wrapper around a dbenv for the Java RPC server.
*/
public class RpcDbEnv extends Timer
{
DbEnv dbenv;
String home;
long idletime, timeout;
int openflags, onflags, offflags;
int refcount = 1;
void dispose()
{
if (dbenv != null) {
try {
dbenv.close(0);
} catch(DbException e) {
e.printStackTrace(DbServer.err);
}
dbenv = null;
}
}
public void close(DbDispatcher server,
__env_close_msg args, __env_close_reply reply)
{
if (--refcount != 0) {
reply.status = 0;
return;
}
try {
dbenv.close(args.flags);
dbenv = null;
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
} finally {
server.delEnv(this);
}
}
public void create(DbDispatcher server,
__env_create_msg args, __env_create_reply reply)
{
this.idletime = (args.timeout != 0) ? args.timeout : DbServer.idleto;
this.timeout = DbServer.defto;
try {
dbenv = new DbEnv(0);
reply.envcl_id = server.addEnv(this);
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
}
}
public void dbremove(DbDispatcher server,
__env_dbremove_msg args, __env_dbremove_reply reply)
{
try {
args.name = (args.name.length() > 0) ? args.name : null;
args.subdb = (args.subdb.length() > 0) ? args.subdb : null;
RpcDbTxn rtxn = server.getTxn(args.txnpcl_id);
DbTxn txn = (rtxn != null) ? rtxn.txn : null;
dbenv.dbremove(txn, args.name, args.subdb, args.flags);
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
}
}
public void dbrename(DbDispatcher server,
__env_dbrename_msg args, __env_dbrename_reply reply)
{
try {
args.name = (args.name.length() > 0) ? args.name : null;
args.subdb = (args.subdb.length() > 0) ? args.subdb : null;
args.newname = (args.newname.length() > 0) ? args.newname : null;
RpcDbTxn rtxn = server.getTxn(args.txnpcl_id);
DbTxn txn = (rtxn != null) ? rtxn.txn : null;
dbenv.dbrename(txn, args.name, args.subdb, args.newname, args.flags);
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
}
}
private boolean findSharedDbEnv(DbDispatcher server, __env_open_reply reply)
throws DbException
{
RpcDbEnv rdbenv = null;
boolean matchFound = false;
LocalIterator i = ((DbServer)server).env_list.iterator();
while (!matchFound && i.hasNext()) {
rdbenv = (RpcDbEnv)i.next();
if (rdbenv != null && rdbenv != this &&
(home == rdbenv.home ||
(home != null && home.equals(rdbenv.home))) &&
openflags == rdbenv.openflags &&
onflags == rdbenv.onflags &&
offflags == rdbenv.offflags)
matchFound = true;
}
if (matchFound) {
/*
* The only thing left to check is the timeout.
* Since the server timeout set by the client is a hint, for sharing
* we'll give them the benefit of the doubt and grant them the
* longer timeout.
*/
if (rdbenv.timeout < timeout)
rdbenv.timeout = timeout;
++rdbenv.refcount;
reply.envcl_id = ((FreeList.FreeListIterator)i).current;
reply.status = 0;
DbServer.err.println("Sharing DbEnv: " + reply.envcl_id);
}
return matchFound;
}
public void open(DbDispatcher server,
__env_open_msg args, __env_open_reply reply)
{
try {
home = (args.home.length() > 0) ? args.home : null;
/*
* If they are using locking do deadlock detection for them,
* internally.
*/
if ((args.flags & Db.DB_INIT_LOCK) != 0)
dbenv.set_lk_detect(Db.DB_LOCK_DEFAULT);
// adjust flags for RPC
int newflags = (args.flags & ~DbServer.DB_SERVER_FLAGMASK);
openflags = (newflags & DbServer.DB_SERVER_ENVFLAGS);
if (findSharedDbEnv(server, reply)) {
dbenv.close(0);
dbenv = null;
server.delEnv(this);
} else {
// TODO: check home?
dbenv.open(home, newflags, args.mode);
reply.status = 0;
reply.envcl_id = args.dbenvcl_id;
}
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
} catch(FileNotFoundException e) {
reply.status = Db.DB_NOTFOUND;
}
// System.err.println("DbEnv.open: reply.status = " + reply.status + ", reply.envcl_id = " + reply.envcl_id);
}
public void remove(DbDispatcher server,
__env_remove_msg args, __env_remove_reply reply)
{
try {
args.home = (args.home.length() > 0) ? args.home : null;
// TODO: check home?
dbenv.remove(args.home, args.flags);
dbenv = null;
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
} catch(FileNotFoundException e) {
reply.status = Db.DB_NOTFOUND;
} finally {
server.delEnv(this);
}
}
public void set_cachesize(DbDispatcher server,
__env_cachesize_msg args, __env_cachesize_reply reply)
{
try {
dbenv.set_cachesize(args.gbytes, args.bytes, args.ncache);
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
}
}
public void set_encrypt(DbDispatcher server,
__env_encrypt_msg args, __env_encrypt_reply reply)
{
try {
dbenv.set_encrypt(args.passwd, args.flags);
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
}
}
public void set_flags(DbDispatcher server,
__env_flags_msg args, __env_flags_reply reply)
{
try {
dbenv.set_flags(args.flags, args.onoff != 0);
if (args.onoff != 0)
onflags |= args.flags;
else
offflags |= args.flags;
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
}
}
// txn_recover implementation
public void txn_recover(DbDispatcher server,
__txn_recover_msg args, __txn_recover_reply reply)
{
try {
DbPreplist[] prep_list = dbenv.txn_recover(args.count, args.flags);
if (prep_list != null && prep_list.length > 0) {
int count = prep_list.length;
reply.retcount = count;
reply.txn = new int[count];
reply.gid = new byte[count * Db.DB_XIDDATASIZE];
for(int i = 0; i < count; i++) {
reply.txn[i] = server.addTxn(new RpcDbTxn(this, prep_list[i].txn));
System.arraycopy(prep_list[i].gid, 0, reply.gid, i * Db.DB_XIDDATASIZE, Db.DB_XIDDATASIZE);
}
}
reply.status = 0;
} catch(DbException e) {
e.printStackTrace(DbServer.err);
reply.status = e.get_errno();
}
}
}
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