Added --disk-cache option

This option enables disk cache. If SIZE is 0, the disk cache is
disabled. This feature caches the downloaded data in memory, which
grows to at most SIZE bytes. The cache storage is created for aria2
instance and shared by all downloads. The one advantage of the disk
cache is reduce the disk seek time because the data is written in
larger unit and it is reordered by the offset of the file. If the
underlying file is heavily fragmented it is not the case.

1 files changed, 55 insertions, 0 deletions

diff --git a/test/WrDiskCacheEntryTest.cc b/test/WrDiskCacheEntryTest.cc
new file mode 100644
index 00000000..ad1c894b
--- /dev/null
+++ b/test/WrDiskCacheEntryTest.cc
@@ -0,0 +1,55 @@
+#include "WrDiskCacheEntry.h"
+
+#include <cstring>
+
+#include <cppunit/extensions/HelperMacros.h>
+
+#include "TestUtil.h"
+#include "DirectDiskAdaptor.h"
+#include "ByteArrayDiskWriter.h"
+
+namespace aria2 {
+
+class WrDiskCacheEntryTest:public CppUnit::TestFixture {
+
+  CPPUNIT_TEST_SUITE(WrDiskCacheEntryTest);
+  CPPUNIT_TEST(testWriteToDisk);
+  CPPUNIT_TEST(testClear);
+  CPPUNIT_TEST_SUITE_END();
+
+  SharedHandle<DirectDiskAdaptor> adaptor_;
+  SharedHandle<ByteArrayDiskWriter> writer_;
+public:
+  void setUp()
+  {
+    adaptor_.reset(new DirectDiskAdaptor());
+    writer_.reset(new ByteArrayDiskWriter());
+    adaptor_->setDiskWriter(writer_);
+  }
+
+  void testWriteToDisk();
+  void testClear();
+};
+
+CPPUNIT_TEST_SUITE_REGISTRATION( WrDiskCacheEntryTest );
+
+void WrDiskCacheEntryTest::testWriteToDisk()
+{
+  WrDiskCacheEntry e(adaptor_);
+  e.cacheData(createDataCell(0, "??01234567", 2));
+  e.cacheData(createDataCell(8, "890"));
+  e.writeToDisk();
+  CPPUNIT_ASSERT_EQUAL((size_t)0, e.getSize());
+  CPPUNIT_ASSERT_EQUAL(std::string("01234567890"), writer_->getString());
+}
+
+void WrDiskCacheEntryTest::testClear()
+{
+  WrDiskCacheEntry e(adaptor_);
+  e.cacheData(createDataCell(0, "foo"));
+  e.clear();
+  CPPUNIT_ASSERT_EQUAL((size_t)0, e.getSize());
+  CPPUNIT_ASSERT_EQUAL(std::string(), writer_->getString());
+}
+
+} // namespace aria2