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package dk.thoerup.circuitbreaker; |
package dk.thoerup.circuitbreaker; |
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import org.junit.*; |
import static org.junit.Assert.assertEquals; |
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import static org.junit.Assert.*; |
import static org.junit.Assert.assertTrue; |
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import dk.thoerup.curcuitbreaker.*; |
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import java.io.IOException; |
import java.io.IOException; |
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import org.junit.Before; |
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import org.junit.Test; |
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import dk.thoerup.curcuitbreaker.CircuitBreaker; |
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import dk.thoerup.curcuitbreaker.CircuitBreakerException; |
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import dk.thoerup.curcuitbreaker.CircuitInvocation; |
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import dk.thoerup.curcuitbreaker.notification.SystemOutNotifier; |
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public class TestCircuitBreaker { |
public class TestCircuitBreaker { |
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public static final int DELAY = 50; |
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public static final int THRESHOLD = 2; |
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class SucceedingInvocation implements CircuitInvocation { |
class SucceedingInvocation implements CircuitInvocation { |
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public Object proceed() throws Exception { |
public Object proceed() throws Exception { |
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return "OK"; |
return "OK"; |
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} |
} |
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} |
} |
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CircuitBreaker cb; |
CircuitBreaker cb; |
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@Before public void setup() { |
@Before public void setup() { |
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cb = new CircuitBreaker("test",2,500); |
cb = new CircuitBreaker("test", THRESHOLD, DELAY); |
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cb.setNotifier( new SystemOutNotifier() ); |
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} |
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@Test public void defaultState() { |
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assertTrue(cb.isClosed()); |
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assertTrue(cb.getFailureCount() == 0); |
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} |
} |
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@Test public void simpleTest() throws Throwable { |
@Test public void simpleTest() throws Exception { |
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String retval = (String) cb.invoke( new SucceedingInvocation() ); |
String retval = (String) cb.invoke( new SucceedingInvocation() ); |
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assertEquals(retval, "OK"); |
assertEquals(retval, "OK"); |
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assertTrue( cb.isClosed() ); |
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assertTrue(cb.getFailureCount() == 0); |
assertTrue(cb.getFailureCount() == 0); |
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} |
} |
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@Test(expected=IOException.class) public void simpleFailingTest() throws Throwable { |
@Test(expected=IOException.class) public void simpleFailingTest() throws Exception { |
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cb.invoke( new FailingInvocation() ); |
cb.invoke( new FailingInvocation() ); |
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} |
} |
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@Test public void failingTest() { |
@Test public void failingTest() { |
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try { |
try { |
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cb.invoke( new FailingInvocation() ); |
cb.invoke( new FailingInvocation() ); |
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}catch (Throwable t) {} |
}catch (Exception e) {} |
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assertTrue(cb.getFailureCount() == 1); |
assertTrue(cb.getFailureCount() == 1); |
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assertTrue(cb.isClosed()); |
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} |
} |
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@Test public void failAndResetTest() throws Throwable { |
@Test public void failAndResetTest() throws Exception { |
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try { |
try { |
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cb.invoke( new FailingInvocation() ); |
cb.invoke( new FailingInvocation() ); |
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}catch (Throwable t) {} |
}catch (Exception e) {} |
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cb.invoke(new SucceedingInvocation() ); //after one good it should reset back to closed |
cb.invoke(new SucceedingInvocation() ); //after one good it should reset back to closed |
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assertTrue(cb.getFailureCount() == 0); |
assertTrue(cb.getFailureCount() == 0); |
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} |
} |
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@Test public void normalOpenTest() throws Throwable { |
@Test public void normalOpenTest() throws Exception { |
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try{ |
try{ |
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cb.invoke( new FailingInvocation() ); |
cb.invoke( new FailingInvocation() ); |
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} catch (IOException e) {} |
} catch (IOException e) {} |
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assertTrue( cb.isOpen() ); |
assertTrue( cb.isOpen() ); |
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} |
} |
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@Test public void forcedResetTest() throws Throwable { |
@Test public void forcedResetTest() throws Exception { |
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try{ |
try{ |
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cb.invoke( new FailingInvocation() ); |
cb.invoke( new FailingInvocation() ); |
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} catch (IOException e) {} |
} catch (IOException e) {} |
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cb.reset(); |
cb.reset(); |
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assertTrue( cb.isClosed() ); |
assertTrue( cb.isClosed() ); |
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assertTrue( cb.getFailureCount() == 0 ); //currently an externally triggered reset doesn't reset failure count - should a forced reset be possible at all ? |
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} |
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@Test(expected=CircuitBreakerException.class) public void openAndFailingTest1() throws Exception { |
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cb.tripBreaker(); |
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assertTrue(cb.isOpen()); |
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cb.invoke( new FailingInvocation() ); |
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} |
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@Test(expected=CircuitBreakerException.class) public void openAndFailingTest2() throws Exception { |
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cb.tripBreaker(); |
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assertTrue(cb.isOpen()); |
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cb.invoke( new SucceedingInvocation() ); |
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} |
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@Test public void halfOpen1() throws Exception { |
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cb.tripBreaker(); |
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assertTrue( cb.isOpen() ); |
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Thread.sleep(DELAY*2); |
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cb.invoke( new SucceedingInvocation() ); |
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assertTrue( cb.isClosed() ); |
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} |
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@Test(expected=CircuitBreakerException.class) public void halfOpen2() throws Exception { |
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cb.tripBreaker(); |
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assertTrue( cb.isOpen() ); |
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Thread.sleep(DELAY*2); |
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cb.invoke( new FailingInvocation() ); //in half open this will cause a CircuitBreakerException |
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} |
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@Test public void halfOpen3() throws Exception { |
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cb.tripBreaker(); |
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assertTrue( cb.isOpen() ); |
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Thread.sleep(DELAY*2); |
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try{ |
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cb.invoke( new FailingInvocation() ); |
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} catch (CircuitBreakerException e) {} |
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assertTrue( cb.isOpen() ); |
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} |
} |
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} |
} |