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Frame reordering window.

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This commit is contained in:
akwizgran
2012-01-19 23:26:26 +00:00
parent 02c516492f
commit e43ffe1ab4
13 changed files with 212 additions and 24 deletions
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1
test/build.xml
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@@ -56,6 +56,7 @@
<test name='net.sf.briar.transport.ConnectionWriterImplTest'/>
<test name='net.sf.briar.transport.ConnectionWriterTest'/>
<test name='net.sf.briar.transport.FrameReadWriteTest'/>
<test name='net.sf.briar.transport.FrameWindowImplTest'/>
<test name='net.sf.briar.transport.IncomingEncryptionLayerImplTest'/>
<test name='net.sf.briar.transport.IncomingSegmentedEncryptionLayerTest'/>
<test name='net.sf.briar.transport.OutgoingEncryptionLayerImplTest'/>

89
test/net/sf/briar/transport/FrameWindowImplTest.java Normal file
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@@ -0,0 +1,89 @@
package net.sf.briar.transport;
import net.sf.briar.BriarTestCase;
import static net.sf.briar.api.transport.TransportConstants.FRAME_WINDOW_SIZE;
import static net.sf.briar.util.ByteUtils.MAX_32_BIT_UNSIGNED;
import org.junit.Test;
public class FrameWindowImplTest extends BriarTestCase {
@Test
public void testWindowSliding() {
FrameWindow w = new FrameWindowImpl();
for(int i = 0; i < 100; i++) {
assertTrue(w.contains(i));
w.remove(i);
assertFalse(w.contains(i));
}
}
@Test
public void testWindowJumping() {
FrameWindow w = new FrameWindowImpl();
for(int i = 0; i < 100; i += 13) {
assertTrue(w.contains(i));
w.remove(i);
assertFalse(w.contains(i));
}
}
@Test
public void testWindowUpperLimit() {
FrameWindow w = new FrameWindowImpl();
// Centre is 0, highest value in window is 15
for(int i = 0; i < 16; i++) assertTrue(w.contains(i));
assertFalse(w.remove(16));
assertTrue(w.remove(15));
assertFalse(w.remove(15));
// Centre is 16, highest value in window is 31
for(int i = 0; i < 32; i++) assertEquals(i != 15, w.contains(i));
assertFalse(w.remove(32));
assertTrue(w.remove(31));
// Values greater than 2^32 - 1 should never be allowed
assertTrue(w.advance(MAX_32_BIT_UNSIGNED - 1));
assertTrue(w.remove(MAX_32_BIT_UNSIGNED - 1));
assertTrue(w.remove(MAX_32_BIT_UNSIGNED));
try {
w.remove(MAX_32_BIT_UNSIGNED + 1);
fail();
} catch(IllegalArgumentException expected) {}
}
@Test
public void testAdvance() {
FrameWindow w = new FrameWindowImpl();
long centre = 0;
for(int i = 0; i < 10; i++) {
long bottom = Math.max(0, centre - FRAME_WINDOW_SIZE / 2);
long top = Math.min(MAX_32_BIT_UNSIGNED,
centre + FRAME_WINDOW_SIZE / 2 - 1);
if(bottom > 0) assertFalse(w.contains(bottom - 1));
for(long j = bottom; j <= top; j++) assertTrue(w.contains(j));
if(top < MAX_32_BIT_UNSIGNED) assertFalse(w.contains(top + 1));
centre += 12345;
assertTrue(w.advance(centre));
}
}
@Test
public void testWindowLowerLimit() {
FrameWindow w = new FrameWindowImpl();
// Centre is 0, negative values should never be allowed
try {
w.remove(-1);
fail();
} catch(IllegalArgumentException expected) {}
// Slide the window twice
assertTrue(w.remove(15));
assertTrue(w.remove(16));
// Centre is 17, lowest value in window is 1
assertFalse(w.remove(0));
assertTrue(w.remove(1));
// Slide the window
assertTrue(w.remove(25));
// Centre is 26, lowest value in window is 10
assertFalse(w.remove(9));
assertTrue(w.remove(10));
}
}