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Factored out multicast propagation algorithm from Switch and Topology, also cleaned up and clarified it a bit.

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This commit is contained in:
Adam Ierymenko 2013-07-10 17:24:27 -04:00
parent 47f611e7b8
commit 9e28bbfbb2
10 changed files with 365 additions and 209 deletions
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44
node/BloomFilter.hpp
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@ -46,21 +46,37 @@ template<unsigned int B>
class BloomFilter
{
public:
/**
* Construct an empty filter
*/
BloomFilter()
throw()
{
memset(_field,0,sizeof(_field));
}
/**
* Construct from a raw filter
*
* @param b Raw filter bits, must be exactly bytes() in length, or NULL to construct empty
*/
BloomFilter(const void *b)
throw()
{
if (b)
memcpy(_field,b,sizeof(_field));
else memset(_field,0,sizeof(_field));
}
/**
* @return Size of filter in bits
*/
inline unsigned int bits() const throw() { return B; }
static inline unsigned int bits() throw() { return B; }
/**
* @return Size of filter in bytes
*/
inline unsigned int bytes() const throw() { return (B / 8); }
static inline unsigned int bytes() throw() { return (B / 8); }
/**
* @return Pointer to portable array of bytes of bytes() length representing filter
@ -78,12 +94,17 @@ public:
/**
* @param n Value to set
* @return True if corresponding bit was already set before this operation
*/
inline void add(unsigned int n)
inline bool set(unsigned int n)
throw()
{
n %= B;
_field[n / 8] |= (1 << (n % 8));
unsigned char *const x = _field + (n / 8);
const unsigned char m = (1 << (n % 8));
bool already = ((*x & m));
*x |= m;
return already;
}
/**
@ -98,20 +119,13 @@ public:
}
/**
* Clear one or more random bits
*
* This is used to apply probabilistic decay and hence "fuzziness" to
* a bloom filter over time.
*
* @param bits Number of bits to clear
* Clear a random bit in this bloom filter
*/
inline void decay(unsigned int bits)
inline void decay()
throw()
{
for(unsigned int i=0;i<bits;++i) {
unsigned int rn = Utils::randomInt<unsigned int>();
_field[(rn >> 7) % (B / 8)] &= ~((unsigned char)(1 << (rn & 7)));
}
const unsigned int rn = Utils::randomInt<unsigned int>();
_field[(rn >> 3) % (B / 8)] &= ~((unsigned char)(1 << (rn & 7)));
}
private: