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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "bucketidfactory.h"
#include "bucketid.h"
#include <vespa/document/base/documentid.h>
#include <ostream>
#include <cassert>
#include <limits>
namespace document {
BucketIdFactory::BucketIdFactory()
: _locationBits(32),
_gidBits(26),
_countBits(6),
_locationMask(0),
_gidMask(0),
_initialCount(0)
{
initializeMasks();
}
void
BucketIdFactory::initializeMasks()
{
assert(_countBits == 6);
_locationMask = _gidMask = std::numeric_limits<uint64_t>::max();
_locationMask <<= (_gidBits + _countBits);
_locationMask >>= (_gidBits + _countBits);
_gidMask >>= _locationBits;
_gidMask <<= (_locationBits + _countBits);
_gidMask >>= _countBits;
_initialCount = _locationBits + _gidBits;
_initialCount <<= 58;
}
BucketId
BucketIdFactory::getBucketId(const DocumentId& id) const
{
uint64_t location = id.getScheme().getLocation();
assert(GlobalId::LENGTH >= sizeof(uint64_t) + 4u);
uint64_t gid;
memcpy(&gid, id.getGlobalId().get() + 4, sizeof(gid));
return BucketId(_locationBits + _gidBits,
_initialCount | (_gidMask & gid) | (_locationMask & location));
}
void
BucketIdFactory::print(std::ostream& out, bool verbose, const std::string& indent) const
{
out << "BucketIdFactory("
<< _locationBits << " location bits, "
<< _gidBits << " gid bits, "
<< _countBits << " count bits";
if (verbose) {
out << std::hex;
out << ",\n" << indent << " location mask: " << _locationMask;
out << ",\n" << indent << " gid mask: " << _gidMask;
out << ",\n" << indent << " initial count: " << _initialCount;
out << std::dec;
}
out << ")";
}
} // document
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