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+/* -*- C++ -*- */
+
+//=============================================================================
+/**
+ * @file Token_Handler.h
+ *
+ * $Id$
+ *
+ * @author Douglas C. Schmidt (schmidt@cs.wustl.edu)
+ * Tim Harrison (harrison@cs.wustl.edu)
+ */
+//=============================================================================
+
+#ifndef ACE_TOKEN_HANDLER_H
+#define ACE_TOKEN_HANDLER_H
+
+#include "ace/Acceptor.h"
+
+#if !defined (ACE_LACKS_PRAGMA_ONCE)
+# pragma once
+#endif /* ACE_LACKS_PRAGMA_ONCE */
+
+#include "ace/SOCK_Acceptor.h"
+#include "ace/Local_Tokens.h"
+#include "ace/Token_Collection.h"
+#include "ace/Token_Request_Reply.h"
+#include "ace/svc_export.h"
+
+#if defined (ACE_HAS_TOKENS_LIBRARY)
+
+/**
+ * @class ACE_Token_Handler
+ *
+ * @brief Product object created by an <ACE_Token_Acceptor>. A
+ * <Token_Handler> exchanges messages with a <Token_Proxy> object
+ * on the client-side.
+ *
+ * This class is the main workhorse of the ACE Token service. It
+ * receives token operation requests from remote clients and turns
+ * them into calls on local tokens (acquire, release, renew, and
+ * remove). In OMG CORBA terms, it is an object adapter. It also
+ * schedules and handles timeouts that are used to support "timed
+ * waits." Clients used timed waits to bound the amount of time
+ * they block trying to get a token.
+ */
+class ACE_Svc_Export ACE_Token_Handler : public ACE_Svc_Handler<ACE_SOCK_STREAM, ACE_NULL_SYNCH>
+{
+
+public:
+ // = Initialization and termination.
+
+ /// Default constructor.
+ ACE_Token_Handler (ACE_Thread_Manager * = 0);
+
+ // = Accessor and mutator methods.
+
+ // = Remote operations "exported" to a client.
+ /**
+ * Try to acquire the token.
+ * Precondition: client *may* hold the token already (i.e.,
+ * supports recursive acquisitions).
+ */
+ virtual int acquire (ACE_Token_Proxy *proxy);
+
+ /// Try to acquire the token.
+ virtual int try_acquire (ACE_Token_Proxy *proxy);
+
+ /// Release the token and allow the next client that is waiting to
+ /// proceed. Preconditions: client must hold the token.
+ virtual int release (ACE_Token_Proxy *proxy);
+
+ /// Yield the token if any clients are waiting, otherwise keep the
+ /// token. Preconditions: client must hold the token.
+ virtual int renew (ACE_Token_Proxy *proxy);
+
+ /**
+ * Remove the specified token from the Token_Map. Preconditions:
+ * ACE_Token must exist. @@ Any other preconditions, e.g., must
+ * client hold token, must there be no waiters, etc.?
+ */
+ virtual int remove (ACE_Token_Proxy *proxy);
+
+ /// Called by TS_[Mutex,RLock,WLock] when we hold the mutex and
+ /// someone wants it.
+ void sleep_hook (void);
+
+ /// Called by TS_[Mutex,RLock,WLock] when we are waiting and acquire
+ /// the mutex.
+ void token_acquired (ACE_TPQ_Entry *);
+
+protected:
+ // = Low level routines for framing requests, dispatching
+ // operations, and returning replies.
+
+ /// Our connection has been closed.
+ virtual int abandon (int send_error);
+
+ /// Receive, frame, and decode the client's request.
+ virtual int recv_request (void);
+
+ /// Dispatch the appropriate operation to handle the client's
+ /// request.
+ virtual int dispatch (void);
+
+ /// Create and send a reply to the client.
+ virtual int send_reply (ACE_UINT32 errnum);
+
+ // = Demultiplexing hooks.
+ /// Callback method invoked by the <ACE_Reactor> when client events
+ /// arrive.
+ virtual int handle_input (ACE_HANDLE);
+
+ // = Timer hook.
+ /// Enable clients to limit the amount of time they wait for a token.
+ virtual int handle_timeout (const ACE_Time_Value &tv, const void *arg);
+
+ /// return a proxy for the calling client_id and token name.
+ ACE_Token_Proxy *get_proxy (void);
+
+private:
+
+ /// Switches on the type of token_request_ and creates a new
+ /// Token_Proxy.
+ virtual ACE_Token_Proxy *create_proxy (void);
+
+ /// Keeps track of the synchronization options (i.e., the timeout
+ /// interval).
+ ACE_Synch_Options request_options_;
+
+ /// collection of the client's token proxies.
+ ACE_Token_Collection collection_;
+
+ /// ID returned by the Reactor that is used to kill registered timers
+ /// when a token operation times out.
+ long timeout_id_;
+
+ /// Cache request from the client.
+ ACE_Token_Request token_request_;
+
+ /// Cache reply to the client.
+ ACE_Token_Reply token_reply_;
+};
+
+// = DESCRIPTION of ACE_TS_* classes:
+// When Tokens are released, waiting token proxies are notified
+// when the releasing thread calls token_acquired on the waiting
+// proxy. The Token Server specializes ACE_Token_Proxy to
+// redefine the implementation of token_acquired. When
+// token_acquired is called, the Token_Handler can then send the
+// response back over the socket connection to unblock the
+// client side.
+// Since only the Token_Handler uses ACE_TS_Mutex, we've moved
+// the definition to the .cpp file.
+
+/**
+ * @class ACE_TS_Mutex
+ *
+ * @brief ACE_TS_Mutex -- ACE_*T*oken_*S*erver_Mutex
+ */
+class ACE_TS_Mutex : public ACE_Local_Mutex
+{
+
+public:
+ /// Creation.
+ ACE_TS_Mutex (const ACE_TCHAR *name,
+ ACE_Token_Handler *th);
+
+protected:
+ /// Somebody wants our token!
+ virtual void sleep_hook (void);
+
+ /**
+ * We've been taken off the waiters list and given the token! Call
+ * the Token_Handler associated at construction, so it can tell the
+ * remote client.
+ */
+ virtual void token_acquired (ACE_TPQ_Entry *);
+
+ /// Duplication.
+ ACE_TS_Mutex (const ACE_TS_Mutex &);
+
+ /// Return a deep copy.
+ virtual ACE_Token_Proxy *clone (void) const;
+
+private:
+ /// The Token Handler associated with this proxy. Set at
+ /// construction and notified when blocking acquires succeed.
+ ACE_Token_Handler* th_;
+};
+
+/**
+ * @class ACE_TS_RLock
+ *
+ * @brief ACE_TS_RLock -- ACE_*T*oken_*S*erver_RLock
+ */
+class ACE_TS_RLock : public ACE_Local_RLock
+{
+public:
+ /// Creation.
+ ACE_TS_RLock (const ACE_TCHAR *name,
+ ACE_Token_Handler *th);
+
+protected:
+ /// Somebody wants our token!
+ virtual void sleep_hook (void);
+
+ /**
+ * We've been taken off the waiters list and given the token! Call
+ * the Token_Handler associated at construction, so it can tell the
+ * remote client.
+ */
+ virtual void token_acquired (ACE_TPQ_Entry *);
+
+ /// Duplication.
+ ACE_TS_RLock (const ACE_TS_RLock&);
+
+ /// Return a deep copy.
+ virtual ACE_Token_Proxy *clone (void) const;
+
+private:
+ /// the Token Handler associated with this proxy. Set at
+ /// construction and notified when blocking acquires succeed.
+ ACE_Token_Handler* th_;
+};
+
+/**
+ * @class ACE_TS_WLock
+ *
+ * @brief ACE_TS_WLock -- ACE_*T*oken_*S*erver_WLock
+ */
+class ACE_TS_WLock : public ACE_Local_WLock
+{
+public:
+ /// Creation.
+ ACE_TS_WLock (const ACE_TCHAR *name,
+ ACE_Token_Handler *th);
+
+protected:
+ /// Somebody wants our token!
+ virtual void sleep_hook (void);
+
+ /**
+ * We've been taken off the waiters list and given the token! Call
+ * the Token_Handler associated at construction, so it can tell the
+ * remote client.
+ */
+ virtual void token_acquired (ACE_TPQ_Entry *);
+
+ /// Duplication.
+ ACE_TS_WLock (const ACE_TS_WLock&);
+
+ /// Return a deep copy.
+ virtual ACE_Token_Proxy *clone (void) const;
+
+private:
+ /// the Token Handler associated with this proxy. Set at
+ /// construction and notified when blocking acquires succeed.
+ ACE_Token_Handler* th_;
+};
+
+/**
+ * @class ACE_Token_Acceptor
+ *
+ * @brief This class contains the service-specific methods that can't
+ * easily be factored into the <ACE_Strategy_Acceptor>.
+ */
+class ACE_Token_Acceptor : public ACE_Strategy_Acceptor<ACE_Token_Handler, ACE_SOCK_ACCEPTOR>
+{
+public:
+ /// Dynamic linking hook.
+ virtual int init (int argc, ACE_TCHAR *argv[]);
+
+ /// Parse svc.conf arguments.
+ int parse_args (int argc, ACE_TCHAR *argv[]);
+
+private:
+ /// The scheduling strategy is designed for Reactive services.
+ ACE_Schedule_All_Reactive_Strategy<ACE_Token_Handler> scheduling_strategy_;
+};
+
+ACE_SVC_FACTORY_DECLARE (ACE_Token_Acceptor)
+
+#endif /* ACE_HAS_TOKENS_LIBRARY */
+#endif /* ACE_TOKEN_HANDLER_H */