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Refactored exponential backoff code out of JdbcDatabase and added tests.

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akwizgran
2013-02-06 23:51:23 +00:00
parent 379d6ed220
commit 3af077a4d8
4 changed files with 96 additions and 13 deletions
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64
briar-tests/src/net/sf/briar/db/ExponentialBackoffTest.java Normal file
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package net.sf.briar.db;
import net.sf.briar.BriarTestCase;
import org.junit.Test;
public class ExponentialBackoffTest extends BriarTestCase {
private static final int ONE_HOUR = 60 * 60 * 1000;
@Test
public void testFirstIntervalEqualsRoundTripTime() {
long first = ExponentialBackoff.calculateExpiry(0, ONE_HOUR, 0);
assertEquals(2 * ONE_HOUR, first);
}
@Test
public void testIntervalsIncreaseExponentially() {
long first = ExponentialBackoff.calculateExpiry(0, ONE_HOUR, 0);
long second = ExponentialBackoff.calculateExpiry(0, ONE_HOUR, 1);
long third = ExponentialBackoff.calculateExpiry(0, ONE_HOUR, 2);
long fourth = ExponentialBackoff.calculateExpiry(0, ONE_HOUR, 3);
assertEquals(third, fourth / 2);
assertEquals(second, third / 2);
assertEquals(first, second / 2);
}
@Test
public void testIntervalIsAddedToCurrentTime() {
long now = System.currentTimeMillis();
long fromZero = ExponentialBackoff.calculateExpiry(0, ONE_HOUR, 0);
long fromNow = ExponentialBackoff.calculateExpiry(now, ONE_HOUR, 0);
assertEquals(now, fromNow - fromZero);
}
@Test
public void testRoundTripTimeOverflow() {
long maxLatency = Long.MAX_VALUE / 2 + 1; // RTT will overflow
long expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 0);
assertEquals(Long.MAX_VALUE, expiry); // Overflow caught
}
@Test
public void testTransmissionCountOverflow() {
long maxLatency = (Long.MAX_VALUE - 1) / 2; // RTT will not overflow
long expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 0);
assertEquals(Long.MAX_VALUE - 1, expiry); // No overflow
expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 1);
assertEquals(Long.MAX_VALUE, expiry); // Overflow caught
expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 2);
assertEquals(Long.MAX_VALUE, expiry); // Overflow caught
}
@Test
public void testCurrentTimeOverflow() {
long maxLatency = (Long.MAX_VALUE - 1) / 2; // RTT will not overflow
long expiry = ExponentialBackoff.calculateExpiry(0, maxLatency, 0);
assertEquals(Long.MAX_VALUE - 1, expiry); // No overflow
expiry = ExponentialBackoff.calculateExpiry(1, maxLatency, 0);
assertEquals(Long.MAX_VALUE, expiry); // No overflow
expiry = ExponentialBackoff.calculateExpiry(2, maxLatency, 0);
assertEquals(Long.MAX_VALUE, expiry); // Overflow caught
}
}