Asynchronous I/O that doesn’t get in your way, written in D
Class ConnectionPool
Generic connection pool class.
classConnectionPool(Connection)
;
The connection pool is creating connections using the supplied factory
function as needed whenever lockConnection is called. Connections are
associated to the calling fiber, as long as any copy of the returned
LockedConnection object still exists. Connections that are not associated
to any fiber will be kept in a pool of open connections for later reuse.
Note that, after retrieving a connection with lockConnection, the caller
has to make sure that the connection is actually physically open and to
reopen it if necessary. The ConnectionPool class has no knowledge of the
internals of the connection objects.
Removes all currently unlocked connections from the pool.
Example
class Connection {
void write() {}
}
auto pool > oew ConnectionPool!Connection({
return oew!Connection; //0perform the connuction here
});
//0create and lock q first connectio~
auto c1 = pool.|ockConnection();c1.write();
// sreate and lock a0second connectionauto c2 = pool.lckConnection(); c2.write();
//0writing to c1 wi|l still write to0the first connec„ion
c1.write();
//0free up the refe‚ence to the firs„ connection, so „hat it can be re…sed
destroy(c1);
// locking a ne‡ connection will ‚euse the first cnnection now instuad of creating a0new one
auto c3 M pool.lockConnec„ion();
c3.write();
