CACacheLoadBalancing Class Reference

This class stores Addresses off different Cache-Proxies. More...

#include <CACacheLoadBalancing.hpp>

Collaboration diagram for CACacheLoadBalancing:

List of all members.

Public Member Functions
	CACacheLoadBalancing ()
	~CACacheLoadBalancing ()
SINT32	clean ()
	Deletes all information.
SINT32	add (CASocketAddr *const pAddr)
CASocketAddrINet *	get ()
	Gets the 'next' Address according to the Load-Balancing algorithm.
UINT32	getElementCount ()
Private Attributes
CACHE_LB_ENTRY *	pSelectedEntry
UINT32	m_ElementCount
CAMutex	m_csLock

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Detailed Description

This class stores Addresses off different Cache-Proxies.

It can be used for Load Balancing between them. Currently a simple Ropund Robin is implemented.

Definition at line 45 of file CACacheLoadBalancing.hpp.

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Constructor & Destructor Documentation

CACacheLoadBalancing::CACacheLoadBalancing

(

)

[inline]

Definition at line 48 of file CACacheLoadBalancing.hpp.

References m_ElementCount, and pSelectedEntry.

        {
          m_ElementCount=0;
          pSelectedEntry=NULL;
        }

CACacheLoadBalancing::~CACacheLoadBalancing

(

)

[inline]

Definition at line 53 of file CACacheLoadBalancing.hpp.

References clean().

{clean();}

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Member Function Documentation

SINT32 CACacheLoadBalancing::add

(

CASocketAddr *const

pAddr

)

Definition at line 36 of file CACacheLoadBalancing.cpp.

References CASocketAddr::clone(), E_SUCCESS, E_UNKNOWN, CASocketAddr::getType(), CAMutex::lock(), m_csLock, m_ElementCount, t_cachelb_list::next, t_cachelb_list::pAddr, pSelectedEntry, and CAMutex::unlock().

Referenced by CALastMix::setTargets().

  {
    if(pAddr->getType()!=AF_INET)
      return E_UNKNOWN;
    CACHE_LB_ENTRY* pEntry=new CACHE_LB_ENTRY;
    if(pEntry==NULL)
      return E_UNKNOWN;
    pEntry->pAddr=(CASocketAddrINet*)pAddr->clone();
    m_csLock.lock();
    if(pSelectedEntry==NULL)
      {
        pSelectedEntry=pEntry;
        pSelectedEntry->next=pSelectedEntry;
      }
    else
      {
        pEntry->next=pSelectedEntry->next;
        pSelectedEntry->next=pEntry;            
      }
    m_ElementCount++;
    m_csLock.unlock();
    return E_SUCCESS;
  }

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SINT32 CACacheLoadBalancing::clean

(

)

[inline]

Deletes all information.

Definition at line 56 of file CACacheLoadBalancing.hpp.

References E_SUCCESS, CAMutex::lock(), m_csLock, m_ElementCount, t_cachelb_list::next, t_cachelb_list::pAddr, pSelectedEntry, and CAMutex::unlock().

Referenced by CALastMix::setTargets(), and ~CACacheLoadBalancing().

        {
          m_csLock.lock();
          CACHE_LB_ENTRY* pEntry;
          CACHE_LB_ENTRY* pFirst=pSelectedEntry;
          while(pSelectedEntry!=NULL)
            {
              if(pSelectedEntry->next==pFirst)
                pEntry=NULL;
              else 
                pEntry=pSelectedEntry->next;
              delete pSelectedEntry->pAddr;
              pSelectedEntry->pAddr = NULL;
              delete pSelectedEntry;
              pSelectedEntry = NULL;
              pSelectedEntry=pEntry;
            }
          m_ElementCount=0;
          m_csLock.unlock();
          return E_SUCCESS;
        }

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CASocketAddrINet* CACacheLoadBalancing::get

(

)

[inline]

Gets the 'next' Address according to the Load-Balancing algorithm.

This is the Address which should be used for a connection to a cache proxy.

Returns:

next Address of a Cache-Proxy

Definition at line 84 of file CACacheLoadBalancing.hpp.

References CAMutex::lock(), m_csLock, t_cachelb_list::next, t_cachelb_list::pAddr, pSelectedEntry, and CAMutex::unlock().

Referenced by CALastMixA::loop(), CALastMixB::loop(), and CALastMix::setTargets().

        {
          m_csLock.lock();
          if(pSelectedEntry==NULL)
            {
              m_csLock.unlock();
              return NULL;
            }
          pSelectedEntry=pSelectedEntry->next;
          m_csLock.unlock();
          return pSelectedEntry->pAddr;
        }

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UINT32 CACacheLoadBalancing::getElementCount

(

)

[inline]

Definition at line 100 of file CACacheLoadBalancing.hpp.

References m_ElementCount.

Referenced by CALastMixA::loop(), CALastMixB::loop(), and CALastMix::setTargets().

        {
          return m_ElementCount;
        }

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Member Data Documentation

CAMutex CACacheLoadBalancing::m_csLock [private]

Definition at line 108 of file CACacheLoadBalancing.hpp.

Referenced by add(), clean(), and get().

UINT32 CACacheLoadBalancing::m_ElementCount [private]

Definition at line 107 of file CACacheLoadBalancing.hpp.

Referenced by add(), CACacheLoadBalancing(), clean(), and getElementCount().

CACHE_LB_ENTRY* CACacheLoadBalancing::pSelectedEntry [private]

Definition at line 106 of file CACacheLoadBalancing.hpp.

Referenced by add(), CACacheLoadBalancing(), clean(), and get().

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

• CACacheLoadBalancing.hpp
• CACacheLoadBalancing.cpp