def __init__(self, local_address, ns_address, client_type):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, client_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"display_status": self.distributed_lock.display_status
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
def __init__(self, local_address, ns_address, server_type, db_file):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, server_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.drwlock = DistributedReadWriteLock(self.distributed_lock)
self.db = database.Database(db_file)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"display_status": self.distributed_lock.display_status,
"write_acquire_local": self.drwlock.write_acquire_local,
"write_release_local": self.drwlock.write_release_local
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
def __init__(self, local_address, ns_address, client_type):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, client_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"display_status": self.distributed_lock.display_status
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
class Client(orb.Peer):
"""Distributed mutual exclusion client class."""
def __init__(self, local_address, ns_address, client_type):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, client_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"display_status": self.distributed_lock.display_status
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
# Public methods
def destroy(self):
# Destroy the lock first to allow the token to be passed if we have it
self.distributed_lock.destroy()
orb.Peer.destroy(self)
self.peer_list.destroy()
def __getattr__(self, attr):
"""Forward calls are dispatched here."""
if attr in self.dispatched_calls:
return self.dispatched_calls[attr]
else:
raise AttributeError(
"Client instance has no attribute '{}'".format(attr))
def register_peer(self, pid, paddr):
self.peer_list.register_peer(pid, paddr)
self.distributed_lock.register_peer(pid)
def unregister_peer(self, pid):
self.peer_list.unregister_peer(pid)
self.distributed_lock.unregister_peer(pid)
class Client(orb.Peer):
"""Distributed mutual exclusion client class."""
def __init__(self, local_address, ns_address, client_type):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, client_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"display_status": self.distributed_lock.display_status
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
# Public methods
def destroy(self):
orb.Peer.destroy(self)
self.distributed_lock.destroy()
self.peer_list.destroy()
def __getattr__(self, attr):
"""Forward calls are dispatched here."""
if attr in self.dispatched_calls:
return self.dispatched_calls[attr]
else:
raise AttributeError(
"Client instance has no attribute '{}'".format(attr))
def register_peer(self, pid, paddr):
self.peer_list.register_peer(pid, paddr)
self.distributed_lock.register_peer(pid)
def unregister_peer(self, pid):
self.peer_list.unregister_peer(pid)
self.distributed_lock.unregister_peer(pid)
def __init__(self, local_address, ns_address, server_type, db_file):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, server_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.drwlock = DistributedReadWriteLock(self.distributed_lock)
self.db = database.Database(db_file)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"obtain_token_no_lock": self.distributed_lock.obtain_token_no_lock,
"display_status": self.distributed_lock.display_status,
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
class Server(orb.Peer):
"""Distributed mutual exclusion client class."""
def __init__(self, local_address, ns_address, server_type, db_file):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, server_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.drwlock = DistributedReadWriteLock(self.distributed_lock)
self.db = database.Database(db_file)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"display_status": self.distributed_lock.display_status
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
# Public methods
def destroy(self):
orb.Peer.destroy(self)
self.distributed_lock.destroy()
self.peer_list.destroy()
def __getattr__(self, attr):
"""Forward calls are dispatched here."""
if attr in self.dispatched_calls:
return self.dispatched_calls[attr]
else:
raise AttributeError(
"Client instance has no attribute '{0}'".format(attr))
# Public methods
def read(self):
"""Read a fortune from the database."""
self.drwlock.read_acquire()
try:
return self.db.read()
finally:
self.drwlock.read_release()
def write(self, fortune):
"""Write a fortune to the database.
Obtain the distributed lock and call all other servers to write
the fortune as well. Call their 'write_local' as they cannot
atempt to obtain the distributed lock when writting their
copies.
"""
self.drwlock.write_acquire()
self.db.write(fortune) # write the fortune locally
# distribute the update to all
peers = self.peer_list.get_peers().keys()
for peer in peers:
self.peer_list.peer(peer).write_local(fortune)
self.drwlock.write_release()
def write_local(self, fortune):
"""Write a fortune to the database.
This method is called only by other servers once they've
obtained the distributed lock.
"""
self.drwlock.write_acquire_local()
try:
self.db.write(fortune)
finally:
self.drwlock.write_release_local()
def register_peer(self, pid, paddr):
"""Register a server peer in this server's peer list."""
self.peer_list.register_peer(pid, paddr)
self.distributed_lock.register_peer(pid)
def unregister_peer(self, pid):
"""Remove a server peer from this server's peer list."""
self.peer_list.unregister_peer(pid)
self.distributed_lock.unregister_peer(pid)
class Server(orb.Peer):
"""Distributed mutual exclusion client class."""
def __init__(self, local_address, ns_address, server_type, db_file):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, server_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.drwlock = DistributedReadWriteLock(self.distributed_lock)
self.db = database.Database(db_file)
self.dispatched_calls = {
"display_peers" : self.peer_list.display_peers,
"acquire" : self.distributed_lock.acquire,
"release" : self.distributed_lock.release,
"request_token" : self.distributed_lock.request_token,
"obtain_token" : self.distributed_lock.obtain_token,
"display_status" : self.distributed_lock.display_status
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
# Public methods
def destroy(self):
orb.Peer.destroy(self)
self.distributed_lock.destroy()
self.peer_list.destroy()
def __getattr__(self, attr):
"""Forward calls are dispatched here."""
if attr in self.dispatched_calls:
return self.dispatched_calls[attr]
else:
raise AttributeError(
"Client instance has no attribute '{0}'".format(attr))
# Public methods
def read(self):
self.drwlock.read_acquire()
fortune = self.db.read()
self.drwlock.read_release()
return fortune
def write(self, fortune):
self.drwlock.write_acquire()
for peer in self.peer_list.peers.items():
peer.write(fortune)
self.drwlock.write_release()
def write_no_lock(self, fortune):
self.db.write(fortune)
def register_peer(self, pid, paddr):
self.peer_list.register_peer(pid, paddr)
self.distributed_lock.register_peer(pid)
def unregister_peer(self, pid):
self.peer_list.unregister_peer(pid)
self.distributed_lock.unregister_peer(pid)
class Server(orb.Peer):
"""Distributed mutual exclusion client class."""
def __init__(self, local_address, ns_address, server_type, db_file):
"""Initialize the client."""
orb.Peer.__init__(self, local_address, ns_address, server_type)
self.peer_list = PeerList(self)
self.distributed_lock = DistributedLock(self, self.peer_list)
self.drwlock = DistributedReadWriteLock(self.distributed_lock)
self.db = database.Database(db_file)
self.dispatched_calls = {
"display_peers": self.peer_list.display_peers,
"acquire": self.distributed_lock.acquire,
"release": self.distributed_lock.release,
"request_token": self.distributed_lock.request_token,
"obtain_token": self.distributed_lock.obtain_token,
"display_status": self.distributed_lock.display_status
}
orb.Peer.start(self)
self.peer_list.initialize()
self.distributed_lock.initialize()
# Public methods
def destroy(self):
orb.Peer.destroy(self)
self.distributed_lock.destroy()
self.peer_list.destroy()
def __getattr__(self, attr):
"""Forward calls are dispatched here."""
if attr in self.dispatched_calls:
return self.dispatched_calls[attr]
else:
raise AttributeError(
"Client instance has no attribute '{0}'".format(attr))
# Public methods
def read(self):
"""Read a fortune from the database."""
#
# Your code here.
#
self.drwlock.read_acquire()
try:
read = self.db.read()
finally:
self.drwlock.read_release()
return read
def write(self, fortune):
"""Write a fortune to the database.
Obtain the distributed lock and call all other servers to write
the fortune as well. Call their 'write_no_lock' as they cannot
atempt to obtain the distributed lock when writting their
copies.
"""
#
# Your code here.
#
peers = self.peer_list.get_peers()
self.drwlock.write_acquire()
try:
# self.peer_list.lock.acquire()
print("Wrote:\n" + fortune)
self.db.write(fortune)
for peer in peers.values():
# if (not (pid == self.id)):
peer.write_no_lock(fortune)
finally:
# self.peer_list.lock.acquire()
self.drwlock.write_release()
def write_no_lock(self, fortune):
"""Write a fortune to the database.
This method is called only by other servers onces they've
obtained the distributed lock.
"""
self.db.write(fortune)
print("Wrote with no lock:\n" + fortune)
def register_peer(self, pid, paddr):
"""Register a server peer in this server's peer list."""
self.peer_list.register_peer(pid, paddr)
self.distributed_lock.register_peer(pid)
def unregister_peer(self, pid):
"""Remove a server peer from this server's peer list."""
self.peer_list.unregister_peer(pid)
self.distributed_lock.unregister_peer(pid)