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INT-1496: start optimistically with success rate 100%

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This commit is contained in:
Dave Syer
2010-10-06 11:00:59 -07:00
parent 71f171b163
commit a21172fdab
2 changed files with 7 additions and 6 deletions
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3
spring-integration-jmx/src/main/java/org/springframework/integration/monitor/ExponentialMovingAverageRatio.java
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@@ -92,7 +92,8 @@ public class ExponentialMovingAverageRatio {
public double getMean() {
int count = cumulative.getCount();
if (count == 0) {
return 0;
// Optimistic to start: success rate is 100%
return 1;
}
long t = System.currentTimeMillis();
double alpha = Math.exp((t0 - t) * lapse);

10
spring-integration-jmx/src/test/java/org/springframework/integration/monitor/ExponentialMovingAverageRatioTests.java
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@@ -45,14 +45,14 @@ public class ExponentialMovingAverageRatioTests {
@Test
public void testGetEarlyMean() throws Exception {
assertEquals(0, history.getMean(), 0.01);
assertEquals(1, history.getMean(), 0.01);
history.success();
assertEquals(1, history.getMean(), 0.01);
}
@Test
public void testGetEarlyFailure() throws Exception {
assertEquals(0, history.getMean(), 0.01);
assertEquals(1, history.getMean(), 0.01);
history.failure();
assertEquals(0, history.getMean(), 0.01);
}
@@ -66,7 +66,7 @@ public class ExponentialMovingAverageRatioTests {
@Test
public void testGetMean() throws Exception {
assertEquals(0, history.getMean(), 0.01);
assertEquals(1, history.getMean(), 0.01);
history.success();
assertEquals(1, history.getMean(), 0.01);
history.success();
@@ -77,7 +77,7 @@ public class ExponentialMovingAverageRatioTests {
@Test
public void testGetMeanFailuresHighRate() throws Exception {
assertEquals(0, history.getMean(), 0.01);
assertEquals(1, history.getMean(), 0.01);
history.success();
assertEquals(average(1), history.getMean(), 0.01);
history.failure();
@@ -88,7 +88,7 @@ public class ExponentialMovingAverageRatioTests {
@Test
public void testGetMeanFailuresLowRate() throws Exception {
assertEquals(0, history.getMean(), 0.01);
assertEquals(1, history.getMean(), 0.01);
history.failure();
assertEquals(average(0), history.getMean(), 0.01);
history.failure();