static CallbackStatus PageInOutWrapCLS(Env env, UInt32 pgno, void* pgaddr, ref DBT pgcookie, PageInOutFcn pgInOut) {
// construct DbEntry for pgcookie
int size = unchecked((int)pgcookie.size);
// we are not using a shared buffer - the call-back might take
// a long time and we do not want to lock the buffer that long
byte[] buffer = new byte[size];
Marshal.Copy((IntPtr)pgcookie.data, buffer, 0, size);
DbEntry cookieEntry = DbEntry.InOut(buffer, 0, size);
cookieEntry.dbt.flags = pgcookie.flags;
cookieEntry.dbt.dlen = pgcookie.dlen;
cookieEntry.dbt.doff = pgcookie.doff;
// call CLS compliant delegate - we assume it is not null
return pgInOut(env, new CachePage(pgno, (IntPtr)pgaddr), ref cookieEntry);
}
public void CacheRegister(int fileType, PageInOutFcn pageIn, PageInOutFcn pageOut) {
DB_ENV.PageInOutFcn pgIn = null;
if (pageIn != null)
pgIn = PageInWrapCLS;
DB_ENV.PageInOutFcn pgOut = null;
if (pageOut != null)
pgOut = PageOutWrapCLS;
CacheRegister(fileType, pgIn, pgOut);
pageInCLS = pageIn;
pageOutCLS = pageOut;
this.pageIn = pgIn;
this.pageOut = pgOut;
}
static CallbackStatus PageInOutWrapCLS(Env env, UInt32 pgno, void* pgaddr, ref DBT pgcookie, PageInOutFcn pgInOut) {
IntPtr cookie = IntPtr.Zero;
// extract IntPtr from DBT
int size = unchecked((int)pgcookie.size);
if (size != 0) {
if (size != sizeof(IntPtr))
throw new BdbException("Invalid page cookie.");
cookie = *(IntPtr*)pgcookie.data;
}
// call CLS compliant delegate - we assume it is not null
return pgInOut(env, new CachePage(pgno, (IntPtr)pgaddr), cookie);
}
