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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.
74 lines
2.1 KiB
C++
74 lines
2.1 KiB
C++
#include "WrDiskCache.h"
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#include <cstring>
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#include <cppunit/extensions/HelperMacros.h>
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#include "TestUtil.h"
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#include "DirectDiskAdaptor.h"
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#include "ByteArrayDiskWriter.h"
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namespace aria2 {
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class WrDiskCacheTest:public CppUnit::TestFixture {
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CPPUNIT_TEST_SUITE(WrDiskCacheTest);
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CPPUNIT_TEST(testAdd);
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CPPUNIT_TEST_SUITE_END();
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SharedHandle<DirectDiskAdaptor> adaptor_;
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SharedHandle<ByteArrayDiskWriter> writer_;
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public:
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void setUp()
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{
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adaptor_.reset(new DirectDiskAdaptor());
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writer_.reset(new ByteArrayDiskWriter());
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adaptor_->setDiskWriter(writer_);
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}
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void testAdd();
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};
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CPPUNIT_TEST_SUITE_REGISTRATION( WrDiskCacheTest );
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void WrDiskCacheTest::testAdd()
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{
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WrDiskCache dc(20);
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CPPUNIT_ASSERT_EQUAL((size_t)0, dc.getSize());
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WrDiskCacheEntry e1(adaptor_);
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e1.cacheData(createDataCell(0, "who knows?"));
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CPPUNIT_ASSERT(dc.add(&e1));
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CPPUNIT_ASSERT_EQUAL((size_t)10, dc.getSize());
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WrDiskCacheEntry e2(adaptor_);
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e2.cacheData(createDataCell(21, "seconddata"));
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CPPUNIT_ASSERT(dc.add(&e2));
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CPPUNIT_ASSERT_EQUAL((size_t)20, dc.getSize());
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WrDiskCacheEntry e3(adaptor_);
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e3.cacheData(createDataCell(10, "hello"));
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CPPUNIT_ASSERT(dc.add(&e3));
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CPPUNIT_ASSERT_EQUAL((size_t)15, dc.getSize());
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// e1 is flushed to the disk
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CPPUNIT_ASSERT_EQUAL(std::string("who knows?"), writer_->getString());
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CPPUNIT_ASSERT_EQUAL((size_t)0, e1.getSize());
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e3.cacheData(createDataCell(15, " world"));
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CPPUNIT_ASSERT(dc.update(&e3, 6));
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// e3 is flushed to the disk
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CPPUNIT_ASSERT_EQUAL(std::string("who knows?hello world"),
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writer_->getString());
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CPPUNIT_ASSERT_EQUAL((size_t)0, e3.getSize());
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CPPUNIT_ASSERT_EQUAL((size_t)10, dc.getSize());
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e2.cacheData(createDataCell(31, "01234567890"));
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CPPUNIT_ASSERT(dc.update(&e2, 11));
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// e2 is flushed to the disk
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CPPUNIT_ASSERT_EQUAL(std::string("who knows?hello worldseconddata01234567890"),
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writer_->getString());
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CPPUNIT_ASSERT_EQUAL((size_t)0, e2.getSize());
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CPPUNIT_ASSERT_EQUAL((size_t)0, dc.getSize());
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}
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} // namespace aria2
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