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Diffstat (limited to 'trunk/ACE/apps/Gateway/Gateway/Event.h')
| -rw-r--r-- | trunk/ACE/apps/Gateway/Gateway/Event.h | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/trunk/ACE/apps/Gateway/Gateway/Event.h b/trunk/ACE/apps/Gateway/Gateway/Event.h new file mode 100644 index 00000000000..4c157bbce68 --- /dev/null +++ b/trunk/ACE/apps/Gateway/Gateway/Event.h @@ -0,0 +1,225 @@ +/* -*- C++ -*- */ +// $Id$ + +// ============================================================================ +// +// = LIBRARY +// gateway +// +// = FILENAME +// Event.h +// +// = AUTHOR +// Doug Schmidt +// +// ============================================================================ + +#ifndef EVENT_H +#define EVENT_H + +#include "ace/os_include/arpa/os_inet.h" + +#if !defined (ACE_LACKS_PRAGMA_ONCE) +# pragma once +#endif /* ACE_LACKS_PRAGMA_ONCE */ + +#include "ace/Basic_Types.h" + +// = The following #defines should really be in a separate include +// file that is shared with the ../Peer/ directory. For now, we'll +// keep them here to simplify the sharing between the two directories. +// BTW, this is also the reason why all the methods are inlined... + +// Used by Peers to create Consumers in a Gateway. +#if !defined (DEFAULT_GATEWAY_CONSUMER_PORT) +#define DEFAULT_GATEWAY_CONSUMER_PORT 10009 +#endif /* DEFAULT_GATEWAY_CONSUMER_PORT */ + +// Used by Peers create Suppliers in a Gateway. +#if !defined (DEFAULT_GATEWAY_SUPPLIER_PORT) +#define DEFAULT_GATEWAY_SUPPLIER_PORT 10010 +#endif /* DEFAULT_GATEWAY_SUPPLIER_PORT */ + +// Used by a Gateway to create Consumers in a Peer. +#if !defined (DEFAULT_PEER_CONSUMER_PORT) +#define DEFAULT_PEER_CONSUMER_PORT 10011 +#endif /* DEFAULT_PEER_CONSUMER_PORT */ + +// Used by a Gateway to create Suppliers in a Peer. +#if !defined (DEFAULT_PEER_SUPPLIER_PORT) +#define DEFAULT_PEER_SUPPLIER_PORT 10012 +#endif /* DEFAULT_PEER_SUPPLIER_PORT */ + +#if !defined (MAX_CONSUMERS) +#define MAX_CONSUMERS 1000 +#endif /* MAX_CONSUMERS */ + +// This is the unique supplier identifier that denotes a particular +// <Connection_Handler> in the Gateway. +typedef ACE_INT32 CONNECTION_ID; + +enum +{ + // = These are the types of events generated by the <Suppliers> and + // handled by the <Event_Channel>. + + ROUTING_EVENT = 0, + // A normal event, which is forwarded to the <Consumers>. + + SUBSCRIPTION_EVENT = 1 + // A subscription to <Suppliers> managed by the <Event_Channel>. +}; + +class Event_Key +{ + // = TITLE + // Address used to identify the source/destination of an event. + // + // = DESCRIPTION + // This is really a "processing descriptor" that is used to + // decouple the processing, filtering, and forwarding logic of + // the Event Channel from the format of the data. The + // <connection_id_> and <type_> fields are copied from the + // <Event_Header> class below. +public: + Event_Key (CONNECTION_ID cid = -1, + ACE_INT32 type = 0, + ACE_INT32 priority = 0) + : connection_id_ (cid), + type_ (type), + priority_ (priority) + { + } + + bool operator== (const Event_Key &event_addr) const + { + return this->connection_id_ == event_addr.connection_id_ + && this->type_ == event_addr.type_; + } + + CONNECTION_ID connection_id_; + // Unique connection identifier that denotes a particular + // Connection_Handler. + + ACE_INT32 type_; + // Event type, e.g., <ROUTING_EVENT> or <SUBSCRIPTION_EVENT>. + + ACE_INT32 priority_; + // Event priority. +}; + +class Event_Header +{ + // = TITLE + // Fixed sized header. + // + // = DESCRIPTION + // This is designed to have a sizeof (16) to avoid alignment + // problems on most platforms. +public: + enum + { + INVALID_ID = -1 // No peer can validly use this number. + }; + + Event_Header (ACE_INT32 len, + CONNECTION_ID connection_id, + ACE_INT32 type, + ACE_INT32 priority) + : len_ (len), + connection_id_ (connection_id), + type_ (type), + priority_ (priority) + { + } + + void decode (void) + { + this->len_ = ntohl (this->len_); + this->connection_id_ = ntohl (this->connection_id_); + this->type_ = ntohl (this->type_); + this->priority_ = ntohl (this->priority_); + } + // Decode from network byte order to host byte order. + + void encode (void) + { + this->len_ = htonl (this->len_); + this->connection_id_ = htonl (this->connection_id_); + this->type_ = htonl (this->type_); + this->priority_ = htonl (this->priority_); + } + // Encode from host byte order to network byte order. + + ACE_INT32 len_; + // Length of the data_ payload, in bytes. + + CONNECTION_ID connection_id_; + // Unique connection identifier that denotes a particular + // Connection_Handler. + + ACE_INT32 type_; + // Event type, e.g., <ROUTING_EVENT> or <SUBSCRIPTION_EVENT>. + + ACE_INT32 priority_; + // Event priority. +}; + +class Event +{ + // = TITLE + // Variable-sized event (data_ may be variable-sized between + // 0 and MAX_PAYLOAD_SIZE). +public: + enum { MAX_PAYLOAD_SIZE = 1024 }; + // The maximum size of an Event. + + Event () : header_ (0, -1, 0, 0) {}; + + Event_Header header_; + // Event header. + + char data_[MAX_PAYLOAD_SIZE]; + // Event data. +}; + +class Subscription +{ + // = TITLE + // Allows Consumers to subscribe to be routed information + // arriving from a particular Supplier connection id. +public: + void decode (void) + { + this->connection_id_ = ntohl (this->connection_id_); + + for (ACE_INT32 i = 0; i < this->total_consumers_; i++) + this->consumers_[i] = ntohl (this->consumers_[i]); + + this->total_consumers_ = ntohl (this->total_consumers_); + } + // Decode from network byte order to host byte order. + + void encode (void) + { + this->connection_id_ = htonl (this->connection_id_); + + for (ACE_INT32 i = 0; i < this->total_consumers_; i++) + this->consumers_[i] = htonl (this->consumers_[i]); + + this->total_consumers_ = htonl (this->total_consumers_); + } + // Encode from host byte order to network byte order. + + ACE_INT32 connection_id_; + // Connection id. + + ACE_INT32 consumers_[MAX_CONSUMERS]; + // Connection ids for consumers that will be routed information + // containing this <connection_id_> + + ACE_INT32 total_consumers_; + // Total number of these consumers. +}; + +#endif /* EVENT_H */ |