On this page we have the code for the Data_Block and Message_Block objects. As you probably suspect from the header on the previous page, the complicated part is in the construction and destruction of the Data_Block.
// page05.html,v 1.9 1999/09/22 03:13:48 jcej Exp #include "block.h" /* Construct a Dat_Block to contain a unit of work. Note the careful construction of the baseclass to set the block type and the locking strategy. */ Data_Block::Data_Block (Unit_Of_Work * _data) : ACE_Data_Block (0, ACE_Message_Block::MB_DATA, 0, 0, new Lock (), 0, 0) ,data_ (_data) { ACE_DEBUG ((LM_DEBUG, "(%P|%t) 0x%x Data_Block ctor for 0x%x\n", (void *) this, (void *) data_)); } /* The Lock object created in the constructor is stored in the baseclass and available through the locking_strategy() method. We can cast it's value to our Lock object and invoke the destroy() to indicate that we want it to go away when the lock is released. */ Data_Block::~Data_Block (void) { ACE_DEBUG ((LM_DEBUG, "(%P|%t) 0x%x Data_Block dtor for 0x%x\n", (void *) this, (void *) data_)); ((Lock *) locking_strategy ())->destroy (); delete data_; } /* Return the data */ Unit_Of_Work *Data_Block::data (void) { return this->data_; } Data_Block:: Lock::Lock (void) { ACE_DEBUG ((LM_DEBUG, "(%P|%t) 0x%x Lock ctor\n", (void *) this)); } Data_Block:: Lock::~Lock (void) { ACE_DEBUG ((LM_DEBUG, "(%P|%t) 0x%x Lock dtor\n", (void *) this)); } /* Delete ourselves to prevent any memory leak */ int Data_Block::Lock::destroy (void) { delete this; return (0); } /* Create an baseclass unit of work when we instantiate a hangup message. */ Message_Block::Message_Block (void) :ACE_Message_Block (new Data_Block (new Unit_Of_Work ())) { ACE_DEBUG ((LM_DEBUG, "(%P|%t) 0x%x Message_Block ctor for shutdown\n", (void *) this)); this->msg_type (MB_HANGUP); } /* Store the unit of work in a Data_Block and initialize the baseclass with that data. */ Message_Block::Message_Block (Unit_Of_Work * _data) :ACE_Message_Block (new Data_Block (_data)) { ACE_DEBUG ((LM_DEBUG, "(%P|%t) 0x%x Message_Block ctor for 0x%x\n", (void *) this, (void *) _data)); } Message_Block::~Message_Block (void) { ACE_DEBUG ((LM_DEBUG, "(%P|%t) 0x%x Message_Block dtor\n", (void *) this)); }