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Fixed weak valued cache test

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* Test should no longer fails when JVM memory is more than
Integer.MAX_VALUE
This commit is contained in:
Markus Kreusch
2015-12-29 21:45:41 +01:00
parent 9385c3bf6d
commit 6acbba476b
1 changed files with 22 additions and 8 deletions
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30
main/filesystem-nio/src/test/java/org/cryptomator/filesystem/nio/WeakValuedCacheTest.java
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@@ -1,5 +1,6 @@
package org.cryptomator.filesystem.nio;
import static java.lang.String.format;
import static org.hamcrest.CoreMatchers.is;
import static org.hamcrest.CoreMatchers.sameInstance;
import static org.junit.Assert.assertThat;
@@ -9,7 +10,6 @@ import static org.mockito.Mockito.when;
import java.util.function.Function;
import org.junit.Before;
import org.junit.Ignore;
import org.junit.Test;
import org.mockito.Mockito;
import org.mockito.invocation.InvocationOnMock;
@@ -83,7 +83,6 @@ public class WeakValuedCacheTest {
}
@Test
@Ignore
public void testCacheDoesNotPreventGarbageCollectionOfValues() {
when(loader.apply(A_KEY)).thenAnswer(this::createValueUsingMoreThanHalfTheJvmMemory);
@@ -91,7 +90,7 @@ public class WeakValuedCacheTest {
// force garbage collection of previously created value by creating an
// object so large it can not coexist with the value
createByteArrayUsingMoreThanHalfTheJvmMemory();
createObjectUsingMoreThanHalfTheJvmMemory();
}
@Test(expected = RuntimeExceptionThrownInLoader.class)
@@ -109,16 +108,31 @@ public class WeakValuedCacheTest {
}
private Value createValueUsingMoreThanHalfTheJvmMemory(InvocationOnMock invocation) {
byte[] data = createByteArrayUsingMoreThanHalfTheJvmMemory();
Object data = createObjectUsingMoreThanHalfTheJvmMemory();
Value value = new Value();
value.setPayload(data);
return value;
}
private byte[] createByteArrayUsingMoreThanHalfTheJvmMemory() {
int max = (int) Runtime.getRuntime().maxMemory();
byte[] data = new byte[max / 2 + 1];
return data;
private Object createObjectUsingMoreThanHalfTheJvmMemory() {
long maxMemory = Runtime.getRuntime().maxMemory();
long moreThanHalfTheJvmMemory = maxMemory / 2 + 1;
return createObjectUsingAtLeast(moreThanHalfTheJvmMemory);
}
private Object createObjectUsingAtLeast(long minMemory) {
if (minMemory <= Integer.MAX_VALUE) {
return new byte[(int) minMemory];
} else if ((minMemory / Integer.MAX_VALUE) <= Integer.MAX_VALUE) {
int numberOfArraysWithMaxIntSize = (int) (minMemory / Integer.MAX_VALUE);
int numberOfRemainingBytes = (int) (minMemory - Integer.MAX_VALUE * numberOfArraysWithMaxIntSize);
return new byte[][][] { //
new byte[numberOfArraysWithMaxIntSize][Integer.MAX_VALUE], //
new byte[1][numberOfRemainingBytes] //
};
} else {
throw new IllegalArgumentException(format("Can not create object with more than 3.999999996 Exabyte"));
}
}
private static class RuntimeExceptionThrownInLoader extends RuntimeException {