1 files changed, 129 insertions, 0 deletions
diff --git a/src/WrDiskCache.cc b/src/WrDiskCache.cc
new file mode 100644
index 00000000..79af80e9
--- /dev/null
+++ b/src/WrDiskCache.cc
@@ -0,0 +1,129 @@
+/* <!-- copyright */
+/*
+ * aria2 - The high speed download utility
+ *
+ * Copyright (C) 2012 Tatsuhiro Tsujikawa
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of portions of this program with the
+ * OpenSSL library under certain conditions as described in each
+ * individual source file, and distribute linked combinations
+ * including the two.
+ * You must obey the GNU General Public License in all respects
+ * for all of the code used other than OpenSSL.  If you modify
+ * file(s) with this exception, you may extend this exception to your
+ * version of the file(s), but you are not obligated to do so.  If you
+ * do not wish to do so, delete this exception statement from your
+ * version.  If you delete this exception statement from all source
+ * files in the program, then also delete it here.
+ */
+/* copyright --> */
+#include "WrDiskCache.h"
+#include "WrDiskCacheEntry.h"
+#include "LogFactory.h"
+#include "fmt.h"
+
+namespace aria2 {
+
+WrDiskCache::WrDiskCache(size_t limit)
+  : limit_(limit),
+    total_(0),
+    clock_(0)
+{}
+
+WrDiskCache::~WrDiskCache()
+{
+  if(total_) {
+    A2_LOG_WARN(fmt("Write disk cache is not empty size=%lu",
+                    static_cast<unsigned long>(total_)));
+  }
+}
+
+bool WrDiskCache::add(WrDiskCacheEntry* ent)
+{
+  ent->setSizeKey(ent->getSize());
+  ent->setLastUpdate(++clock_);
+  std::pair<EntrySet::iterator, bool> rv = set_.insert(ent);
+  if(rv.second) {
+    total_ += ent->getSize();
+    ensureLimit();
+    return true;
+  } else {
+    A2_LOG_WARN(fmt("Found duplicate cache entry a.{size=%lu,clock=%"PRId64
+                    "} b{size=%lu,clock=%"PRId64"}",
+                    static_cast<unsigned long>((*rv.first)->getSize()),
+                    (*rv.first)->getLastUpdate(),
+                    static_cast<unsigned long>(ent->getSize()),
+                    ent->getLastUpdate()));
+    return false;
+  }
+}
+
+bool WrDiskCache::remove(WrDiskCacheEntry* ent)
+{
+  if(set_.erase(ent)) {
+    A2_LOG_DEBUG(fmt("Removed cache entry size=%lu, clock=%"PRId64,
+                     static_cast<unsigned long>(ent->getSize()),
+                     ent->getLastUpdate()));
+    total_ -= ent->getSize();
+    return true;
+  } else {
+    return false;
+  }
+}
+
+bool WrDiskCache::update(WrDiskCacheEntry* ent, ssize_t delta)
+{
+  if(!set_.erase(ent)) {
+    return false;
+  }
+  A2_LOG_DEBUG(fmt("Update cache entry size=%lu, delta=%ld, clock=%"PRId64,
+                   static_cast<unsigned long>(ent->getSize()),
+                   static_cast<long>(delta),
+                   ent->getLastUpdate()));
+
+  ent->setSizeKey(ent->getSize());
+  ent->setLastUpdate(++clock_);
+  set_.insert(ent);
+
+  if(delta < 0) {
+    assert(total_ >= static_cast<size_t>(-delta));
+  }
+  total_ += delta;
+  ensureLimit();
+  return true;
+}
+
+void WrDiskCache::ensureLimit()
+{
+  while(total_ > limit_) {
+    EntrySet::iterator i = set_.begin();
+    total_ -= (*i)->getSize();
+    (*i)->writeToDisk();
+    WrDiskCacheEntry* ent = *i;
+    A2_LOG_DEBUG(fmt("Force flush cache entry size=%lu, clock=%"PRId64,
+                     static_cast<unsigned long>(ent->getSizeKey()),
+                     ent->getLastUpdate()));
+    set_.erase(i);
+
+    ent->setSizeKey(ent->getSize());
+    ent->setLastUpdate(++clock_);
+    set_.insert(ent);
+  }
+}
+
+} // namespace aria2