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85 lines
2.5 KiB
C++
85 lines
2.5 KiB
C++
//------------------------------------------------------------------------------
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/*
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This file is part of rippled: https://github.com/ripple/rippled
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Copyright (c) 2014 Ripple Labs Inc.
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Permission to use, copy, modify, and/or distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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//==============================================================================
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#include <BeastConfig.h>
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#include <ripple/app/book/BookTip.h>
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namespace ripple {
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namespace core {
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BookTip::BookTip (LedgerView& view, BookRef book)
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: m_view (view)
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, m_valid (false)
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, m_book (getBookBase (book))
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, m_end (getQualityNext (m_book))
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{
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}
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bool
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BookTip::step ()
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{
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if (m_valid)
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{
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if (m_entry)
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{
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view().offerDelete (m_index);
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m_entry = nullptr;
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}
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}
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for(;;)
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{
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// See if there's an entry at or worse than current quality. Notice
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// that the quality is encoded only in the index of the first page
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// of a directory.
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auto const first_page (view().getNextLedgerIndex (m_book, m_end));
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if (first_page.isZero())
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return false;
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unsigned int di (0);
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SLE::pointer dir;
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if (view().dirFirst (first_page, dir, di, m_index))
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{
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m_dir = dir->getIndex();
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m_entry = view().entryCache (ltOFFER, m_index);
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m_quality = Quality (getQuality (first_page));
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m_valid = true;
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// Next query should start before this directory
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m_book = first_page;
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// The quality immediately before the next quality
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--m_book;
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break;
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}
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// There should never be an empty directory but just in case,
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// we handle that case by advancing to the next directory.
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m_book = first_page;
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}
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return true;
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}
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}
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}
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