Collage  1.5.0
High-performance C++ library for developing object-oriented distributed applications.
co::LocalNode Class Reference

Node specialization for a local node. More...

#include <localNode.h>

+ Inheritance diagram for co::LocalNode:
+ Collaboration diagram for co::LocalNode:

Public Types

enum  Counter { COUNTER_MAP_OBJECT_REMOTE, COUNTER_ALL }
 Counters are monotonically increasing performance variables for operations performed by a LocalNode instance. More...
 
- Public Types inherited from co::Dispatcher
typedef CommandFunc< DispatcherFunc
 The signature of the base Dispatcher callback. More...
 

Public Member Functions

CO_API LocalNode (const uint32_t type=co::NODETYPE_NODE)
 Construct a new local node of the given type. More...
 
CO_API void ackRequest (NodePtr node, const uint32_t requestID)
 
CO_API void ping (NodePtr remoteNode)
 Request keep-alive update from the remote node. More...
 
CO_API bool pingIdleNodes ()
 Request updates from all nodes above keep-alive timeout. More...
 
CO_API void setAffinity (const int32_t affinity)
 Bind this, the receiver and the command thread to the given lunchbox::Thread affinity.
 
CO_API void addConnection (ConnectionPtr connection)
 
State Changes

The following methods affect the state of the node by changing its connectivity to the network.

virtual CO_API bool initLocal (const int argc, char **argv)
 Initialize the node. More...
 
virtual CO_API bool listen ()
 Open all connections and put this node into the listening state. More...
 
virtual CO_API bool close ()
 Close a listening node. More...
 
virtual bool exitLocal ()
 Close a listening node. More...
 
CO_API bool connect (NodePtr node)
 Connect a remote node (proxy) to this listening node. More...
 
CO_API NodePtr connect (const NodeID &nodeID)
 Create and connect a node given by an identifier. More...
 
CO_API NodePtr connectObjectMaster (const uint128_t &id)
 Find and connect the node where the given object is registered. More...
 
virtual CO_API bool disconnect (NodePtr node)
 Disconnect a connected node. More...
 
Launching a remote node
CO_API bool launch (NodePtr node, const std::string &command)
 Launch a remote process using the given command. More...
 
CO_API NodePtr syncLaunch (const uint128_t &nodeID, int64_t timeout)
 Wait for a launched node to connect. More...
 
Data Access
CO_API NodePtr getNode (const NodeID &id) const
 Get a node by identifier. More...
 
CO_API Nodes getNodes (const bool addSelf=true) const
 
CO_API CommandQueuegetCommandThreadQueue ()
 Return the command queue to the command thread. More...
 
CO_API bool inCommandThread () const
 
CO_API int64_t getTime64 () const
 
CO_API ssize_t getCounter (const Counter counter) const
 
- Public Member Functions inherited from co::Node
CO_API Node (const uint32_t type=co::NODETYPE_NODE)
 Construct a new node proxy. More...
 
CO_API int64_t getLastReceiveTime () const
 
CO_API std::string serialize () const
 
CO_API bool deserialize (std::string &data)
 
CO_API const NodeIDgetNodeID () const
 Get the node's unique identifier. More...
 
CO_API uint32_t getType () const
 
bool operator== (const Node *n) const
 
bool isBigEndian () const
 
CO_API bool isReachable () const
 
CO_API bool isConnected () const
 
CO_API bool isListening () const
 
CO_API bool isClosed () const
 
CO_API bool isClosing () const
 
bool isLocal () const
 
CO_API void addConnectionDescription (ConnectionDescriptionPtr cd)
 Add a new description how this node can be reached. More...
 
CO_API bool removeConnectionDescription (ConnectionDescriptionPtr cd)
 Removes a connection description. More...
 
CO_API ConnectionDescriptions getConnectionDescriptions () const
 
CO_API ConnectionPtr getConnection (const bool multicast=false)
 Get an active connection to this node. More...
 
CO_API OCommand send (const uint32_t cmd, const bool multicast=false)
 Send a command with optional data to the node. More...
 
CO_API CustomOCommand send (const uint128_t &commandID, const bool multicast=false)
 Send a custom command with optional data to the node. More...
 
CO_API void setHostname (const std::string &host)
 Set the host name for the launch command. More...
 
CO_API const std::string & getHostname () const
 
virtual CO_API std::string getWorkDir () const
 
virtual CO_API std::string getLaunchQuote () const
 
- Public Member Functions inherited from co::Dispatcher
Dispatcheroperator= (const Dispatcher &)
 
template<typename T >
void registerCommand (const uint32_t command, const CommandFunc< T > &func, CommandQueue *queue)
 Register a command member function for a command. More...
 
- Public Member Functions inherited from co::ObjectHandler
CO_API void releaseObject (Object *object)
 Convenience method to deregister or unmap an object. More...
 

Protected Member Functions

CO_API ~LocalNode () override
 Destruct this local node. More...
 
CO_API bool connect (NodePtr node, ConnectionPtr connection)
 
virtual void notifyConnect (NodePtr)
 
virtual void notifyDisconnect (NodePtr)
 
virtual CO_API NodePtr createNode (const uint32_t type)
 Factory method to create a new node. More...
 
- Protected Member Functions inherited from co::Node
virtual CO_API ~Node ()
 Destruct this node. More...
 
void _addConnectionDescription (ConnectionDescriptionPtr cd)
 
bool _removeConnectionDescription (ConnectionDescriptionPtr cd)
 
ConnectionPtr _getMulticast () const
 
ConnectionPtr getMulticast ()
 Activate and return a multicast connection. More...
 
- Protected Member Functions inherited from co::Dispatcher
CO_API Dispatcher (const Dispatcher &from)
 
CO_API bool _cmdUnknown (ICommand &command)
 The default handler for handling commands. More...
 
- Protected Member Functions inherited from co::ObjectHandler
 ObjectHandler ()
 Construct a new object handler. More...
 
virtual ~ObjectHandler ()
 Destroy this object handler. More...
 

Friends

class detail::ReceiverThread
 
class detail::CommandThread
 
class ObjectStore
 

Object Registry

typedef boost::function< void(const uint128_t &, const uint128_t &, const uint128_t &, DataIStream &) > PushHandler
 Function signature for push handlers. More...
 
typedef boost::function< bool(CustomICommand &) > CommandHandler
 Function signature for custom command handlers. More...
 
CO_API bool registerObject (Object *object) override
 Register a distributed object. More...
 
CO_API void deregisterObject (Object *object) override
 Deregister a distributed object. More...
 
CO_API f_bool_t mapObject (Object *object, const uint128_t &id, NodePtr master, const uint128_t &version=VERSION_OLDEST)
 Map a distributed object. More...
 
f_bool_t mapObject (Object *object, const ObjectVersion &v)
 Convenience wrapper for mapObject(). More...
 
f_bool_t mapObject (Object *object, const uint128_t &id, const uint128_t &version=VERSION_OLDEST)
 
CO_API uint32_t mapObjectNB (Object *object, const uint128_t &id, const uint128_t &version=VERSION_OLDEST)
 
CO_API uint32_t mapObjectNB (Object *object, const uint128_t &id, const uint128_t &version, NodePtr master) override
 
CO_API bool mapObjectSync (const uint32_t requestID) override
 
CO_API f_bool_t syncObject (Object *object, const uint128_t &id, NodePtr master, const uint32_t instanceID=CO_INSTANCE_ALL) override
 Synchronize the local object with a remote object. More...
 
CO_API void unmapObject (Object *object) override
 Unmap a mapped object. More...
 
CO_API void disableInstanceCache ()
 Disable the instance cache of a stopped local node. More...
 
CO_API void expireInstanceData (const int64_t age)
 
CO_API void enableSendOnRegister ()
 Enable sending instance data after registration. More...
 
CO_API void disableSendOnRegister ()
 Disable sending data of newly registered objects. More...
 
virtual CO_API void objectPush (const uint128_t &groupID, const uint128_t &objectType, const uint128_t &objectID, DataIStream &istream)
 Handler for an Object::push() operation. More...
 
CO_API void registerPushHandler (const uint128_t &groupID, const PushHandler &handler)
 Register a custom handler for Object::push operations. More...
 
CO_API bool registerCommandHandler (const uint128_t &command, const CommandHandler &func, CommandQueue *queue)
 Register a custom command handler handled by this node. More...
 
CO_API void swapObject (Object *oldObject, Object *newObject)
 

Operations

typedef lunchbox::RefPtr< co::SendTokenSendToken
 A handle for a send token acquired by acquireSendToken(). More...
 
CO_API ConnectionPtr addListener (ConnectionDescriptionPtr desc)
 Add a listening connection to this listening node. More...
 
CO_API void addListener (ConnectionPtr connection)
 Add a listening connection to this listening node. More...
 
CO_API void removeListeners (const Connections &connections)
 Remove listening connections from this listening node. More...
 
CO_API void flushCommands ()
 
CO_API BufferPtr allocBuffer (const uint64_t size)
 
CO_API bool dispatchCommand (ICommand &command) override
 Dispatches a command to the registered command queue. More...
 
CO_API SendToken acquireSendToken (NodePtr toNode)
 Acquire a send token from the given node. More...
 
CO_API void releaseSendToken (SendToken token)
 
CO_API Zeroconf getZeroconf ()
 

Detailed Description

Node specialization for a local node.

Local nodes listen on network connections, manage connections to other nodes and provide Object registration, mapping and command dispatch. Typically each process uses one local node to communicate with other processes.

Definition at line 44 of file localNode.h.

Member Typedef Documentation

typedef boost::function< bool( CustomICommand& ) > co::LocalNode::CommandHandler

Function signature for custom command handlers.

Version
1.0

Definition at line 405 of file localNode.h.

typedef boost::function< void( const uint128_t&, const uint128_t&, const uint128_t&, DataIStream& ) > co::LocalNode::PushHandler

Function signature for push handlers.

Version
1.0

Definition at line 389 of file localNode.h.

typedef lunchbox::RefPtr< co::SendToken > co::LocalNode::SendToken

A handle for a send token acquired by acquireSendToken().

Definition at line 500 of file localNode.h.

Member Enumeration Documentation

Counters are monotonically increasing performance variables for operations performed by a LocalNode instance.

Enumerator
COUNTER_MAP_OBJECT_REMOTE 

Num of mapObjects served for other nodes.

Definition at line 52 of file localNode.h.

Constructor & Destructor Documentation

CO_API co::LocalNode::LocalNode ( const uint32_t  type = co::NODETYPE_NODE)
explicit

Construct a new local node of the given type.

Version
1.0
CO_API co::LocalNode::~LocalNode ( )
overrideprotected

Destruct this local node.

Version
1.0

Member Function Documentation

CO_API SendToken co::LocalNode::acquireSendToken ( NodePtr  toNode)

Acquire a send token from the given node.

The token is released automatically when it leaves its scope or explicitly using releaseSendToken().

Returns
The send token.
CO_API ConnectionPtr co::LocalNode::addListener ( ConnectionDescriptionPtr  desc)

Add a listening connection to this listening node.

Returns
the listening connection, or 0 upon error.
CO_API void co::LocalNode::addListener ( ConnectionPtr  connection)

Add a listening connection to this listening node.

virtual CO_API bool co::LocalNode::close ( )
virtual

Close a listening node.

Disconnects all connected node proxies, closes the listening connections and terminates all threads created in listen().

Returns
true if the node was stopped, false otherwise.
Version
1.0

Referenced by exitLocal().

+ Here is the caller graph for this function:

CO_API bool co::LocalNode::connect ( NodePtr  node)

Connect a remote node (proxy) to this listening node.

The connection descriptions of the node are used to connect the remote local node. On success, the node is in the connected state, otherwise its state is unchanged.

This method is one-sided, that is, the node to be connected should not initiate a connection to this node at the same time. For concurrent connects use the other connect() method using node identifiers.

Parameters
nodethe remote node.
Returns
true if this node was connected, false otherwise.
Version
1.0
CO_API NodePtr co::LocalNode::connect ( const NodeID nodeID)

Create and connect a node given by an identifier.

This method is two-sided and thread-safe, that is, it can be called by multiple threads on the same node with the same nodeID, or concurrently on two nodes with each others' nodeID.

Parameters
nodeIDthe identifier of the node to connect.
Returns
the connected node, or an invalid RefPtr if the node could not be connected.
Version
1.0
CO_API NodePtr co::LocalNode::connectObjectMaster ( const uint128_t &  id)

Find and connect the node where the given object is registered.

This method is relatively expensive, since potentially all connected nodes are queried.

Parameters
idthe identifier of the object to search for.
Returns
the connected node, or an invalid RefPtr if the node could not be found or connected.
See also
registerObject(), connect()
Version
1.1.1
virtual CO_API NodePtr co::LocalNode::createNode ( const uint32_t  type)
protectedvirtual

Factory method to create a new node.

Parameters
typethe type the node type
Returns
the node.
See also
ctor type parameter
Version
1.0
CO_API void co::LocalNode::deregisterObject ( Object object)
overridevirtual

Deregister a distributed object.

All slave instances should be unmapped before this call, and will be forcefully unmapped by this method.

Parameters
objectthe object instance.
Version
1.0

Implements co::ObjectHandler.

CO_API void co::LocalNode::disableInstanceCache ( )

Disable the instance cache of a stopped local node.

Version
1.0
CO_API void co::LocalNode::disableSendOnRegister ( )

Disable sending data of newly registered objects.

Version
1.0
virtual CO_API bool co::LocalNode::disconnect ( NodePtr  node)
virtual

Disconnect a connected node.

Parameters
nodethe remote node.
Returns
true if the node was disconnected correctly, false otherwise.
Version
1.0
CO_API bool co::LocalNode::dispatchCommand ( ICommand command)
overridevirtual

Dispatches a command to the registered command queue.

Applications using custom command types have to override this method to dispatch the custom commands.

Parameters
commandthe command.
Returns
the result of the operation.
See also
ICommand::invoke
Version
1.0

Reimplemented from co::Dispatcher.

CO_API void co::LocalNode::enableSendOnRegister ( )

Enable sending instance data after registration.

Send-on-register starts transmitting instance data of registered objects directly after they have been registered. The data is cached on remote nodes and accelerates object mapping. Send-on-register should not be active when remote nodes are joining a multicast group of this node, since they will potentially read out-of-order data streams on the multicast connection.

Enable and disable are counted, that is, the last enable on a matched series of disable/enable will be effective. The disable is completely synchronous, that is, no more instance data will be sent after the first disable.

Version
1.0
virtual bool co::LocalNode::exitLocal ( )
inlinevirtual

Close a listening node.

Version
1.0

Definition at line 119 of file localNode.h.

References close().

+ Here is the call graph for this function:

CO_API CommandQueue* co::LocalNode::getCommandThreadQueue ( )

Return the command queue to the command thread.

Version
1.0
CO_API NodePtr co::LocalNode::getNode ( const NodeID id) const

Get a node by identifier.

The node might not be connected. Thread safe.

Parameters
idthe node identifier.
Returns
the node.
Version
1.0
CO_API Nodes co::LocalNode::getNodes ( const bool  addSelf = true) const
Returns
a vector of the currently connected nodes.
Version
1.0
CO_API Zeroconf co::LocalNode::getZeroconf ( )
Returns
a Zeroconf communicator handle for this node.
Version
1.0
CO_API bool co::LocalNode::inCommandThread ( ) const
Returns
true if executed from the command handler thread, false if not.
Version
1.0
virtual CO_API bool co::LocalNode::initLocal ( const int  argc,
char **  argv 
)
virtual

Initialize the node.

Parses the following command line options and calls listen() afterwards:

The '–co-listen <connection description>' command line option is parsed by this method to add listening connections to this node. This parameter might be used multiple times. ConnectionDescription::fromString() is used to parse the provided description.

The '–co-globals <string>' option is used to initialize the Globals. The string is parsed used Globals::fromString().

Please note that further command line parameters are recognized by co::init().

Parameters
argcthe command line argument count.
argvthe command line argument values.
Returns
true if the client was successfully initialized, false otherwise.
Version
1.0
CO_API bool co::LocalNode::launch ( NodePtr  node,
const std::string &  command 
)

Launch a remote process using the given command.

The launched node will automatically connect with this node, if it passes the given options to its initLocal().

The following markers are replaced in the command:

Returns
true if the launch process execution was successful.
virtual CO_API bool co::LocalNode::listen ( )
virtual

Open all connections and put this node into the listening state.

The node will spawn a receiver and command thread, and listen on all connections for incoming commands. The node will be in the listening state if the method completed successfully. A listening node can connect other nodes.

Returns
true if the node could be initialized, false otherwise.
See also
connect()
Version
1.0
CO_API f_bool_t co::LocalNode::mapObject ( Object object,
const uint128_t &  id,
NodePtr  master,
const uint128_t &  version = VERSION_OLDEST 
)

Map a distributed object.

The mapped object becomes a slave instance of the master version which was registered with the provided identifier. The given version can be used to map a specific version.

If VERSION_NONE is provided, the slave instance is not initialized with any data from the master. This is useful if the object has been pre-initialized by other means, for example from a shared file system.

If VERSION_OLDEST is provided, the oldest available version is mapped.

If a concrete requested version no longer exists, mapObject() will map the oldest available version.

If the requested version is newer than the head version, mapObject() will block until the requested version is available.

Mapping an object is a potentially time-consuming operation. Using mapObjectNB() and mapObjectSync() to asynchronously map multiple objects in parallel improves performance of this operation.

After mapping, the object will have the version used during initialization, or VERSION_NONE if mapped to this version.

When no master node is given, connectObjectMaster() is used to find the node with the master instance.

This method returns immediately after initiating the mapping. Evaluating the value of the returned lunchbox::Future will block on the completion of the operation and return true if the object was mapped, false if the master of the object is not found or the requested version is no longer available.

Parameters
objectthe object.
idthe master object identifier.
masterthe node with the master instance, may be 0.
versionthe initial version.
Returns
A lunchbox::Future which will deliver the success status of the operation on evaluation.
See also
registerObject
Version
1.0

Referenced by mapObject().

+ Here is the caller graph for this function:

f_bool_t co::LocalNode::mapObject ( Object object,
const ObjectVersion v 
)
inline

Convenience wrapper for mapObject().

Version
1.0

Definition at line 281 of file localNode.h.

References co::ObjectVersion::identifier, mapObject(), and co::ObjectVersion::version.

+ Here is the call graph for this function:

f_bool_t co::LocalNode::mapObject ( Object object,
const uint128_t &  id,
const uint128_t &  version = VERSION_OLDEST 
)
inline
Deprecated:

Definition at line 285 of file localNode.h.

References mapObject().

+ Here is the call graph for this function:

CO_API uint32_t co::LocalNode::mapObjectNB ( Object object,
const uint128_t &  id,
const uint128_t &  version = VERSION_OLDEST 
)
CO_API uint32_t co::LocalNode::mapObjectNB ( Object object,
const uint128_t &  id,
const uint128_t &  version,
NodePtr  master 
)
overridevirtual
CO_API bool co::LocalNode::mapObjectSync ( const uint32_t  requestID)
overridevirtual
virtual CO_API void co::LocalNode::objectPush ( const uint128_t &  groupID,
const uint128_t &  objectType,
const uint128_t &  objectID,
DataIStream istream 
)
virtual

Handler for an Object::push() operation.

Called at least on each node listed in an Object::push() operation upon reception of the pushed data from the command thread. Called on all nodes of a multicast group, even for nodes not listed in the Object::push().

The default implementation calls registered push handlers. Typically used to create an object on a remote node, using the objectType for instantiation, the istream to initialize it, and the objectID to map it using VERSION_NONE. The groupID may be used to differentiate multiple concurrent push operations.

Parameters
groupIDThe group identifier given to Object::push()
objectTypeThe type identifier given to Object::push()
objectIDThe identifier of the pushed object
istreamthe input data stream containing the instance data.
Version
1.0
CO_API void co::LocalNode::ping ( NodePtr  remoteNode)

Request keep-alive update from the remote node.

CO_API bool co::LocalNode::pingIdleNodes ( )

Request updates from all nodes above keep-alive timeout.

Returns
true if at least one ping was send.
CO_API bool co::LocalNode::registerCommandHandler ( const uint128_t &  command,
const CommandHandler func,
CommandQueue queue 
)

Register a custom command handler handled by this node.

Custom command handlers are invoked on reception of a CustomICommand send by Node::send( uint128_t, ... ). The command identifier needs to be unique. It is recommended to use servus::make_uint128() to generate this identifier.

Parameters
commandthe unique identifier of the custom command
functhe handler function for the custom command
queuethe queue where the command should be inserted to
Returns
true on successful registering, false otherwise
Version
1.0
CO_API bool co::LocalNode::registerObject ( Object object)
overridevirtual

Register a distributed object.

Registering a distributed object makes this object the master version. The object's identifier is used to map slave instances of the object. Master versions of objects are typically writable and can commit new versions of the distributed object.

Parameters
objectthe object instance.
Returns
true if the object was registered, false otherwise.
Version
1.0

Implements co::ObjectHandler.

CO_API void co::LocalNode::registerPushHandler ( const uint128_t &  groupID,
const PushHandler handler 
)

Register a custom handler for Object::push operations.

The registered handler function will be called automatically for an incoming object push. Threadsafe with itself and objectPush().

Parameters
groupIDThe group identifier given to Object::push()
handlerThe handler function called for a registered groupID
Version
1.0
CO_API void co::LocalNode::releaseSendToken ( SendToken  token)
Deprecated:
Token will auto-release when leaving scope.
CO_API void co::LocalNode::removeListeners ( const Connections connections)

Remove listening connections from this listening node.

CO_API NodePtr co::LocalNode::syncLaunch ( const uint128_t &  nodeID,
int64_t  timeout 
)

Wait for a launched node to connect.

Returns
the remote node handle, or 0 on timeout.
CO_API f_bool_t co::LocalNode::syncObject ( Object object,
const uint128_t &  id,
NodePtr  master,
const uint32_t  instanceID = CO_INSTANCE_ALL 
)
overridevirtual

Synchronize the local object with a remote object.

The object is synchronized to the newest version of the first attached object on the given master node matching the instanceID. When no master node is given, connectObjectMaster() is used to find the node with the master instance. When CO_INSTANCE_ALL is given, the first instance is used. Before a successful return, applyInstanceData() is called on the calling thread to synchronize the given object.

Parameters
objectThe local object instance to synchronize.
masterThe node where the synchronizing object is attached.
idthe object identifier.
instanceIDthe instance identifier of the synchronizing object.
Returns
A lunchbox::Future which will deliver the success status of the operation on evaluation.
Version
1.1.1

Implements co::ObjectHandler.

CO_API void co::LocalNode::unmapObject ( Object object)
overridevirtual

Unmap a mapped object.

Parameters
objectthe mapped object.
Version
1.0

Implements co::ObjectHandler.


The documentation for this class was generated from the following file: