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package dk.thoerup.circuitbreaker;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertTrue;
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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 {
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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 {
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public Object proceed() throws Exception {
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return "OK";
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}
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}
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class FailingInvocation implements CircuitInvocation {
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public Object proceed() throws Exception {
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throw new IOException("Error");
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}
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}
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CircuitBreaker cb;
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@Before public void setup() {
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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 Exception {
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String retval = (String) cb.invoke( new SucceedingInvocation() );
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assertEquals(retval, "OK");
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assertTrue( cb.isClosed() );
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assertTrue(cb.getFailureCount() == 0);
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}
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@Test(expected=IOException.class) public void simpleFailingTest() throws Exception {
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cb.invoke( new FailingInvocation() );
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}
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@Test public void failingTest() {
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try {
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cb.invoke( new FailingInvocation() );
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}catch (Exception e) {}
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assertTrue(cb.getFailureCount() == 1);
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assertTrue(cb.isClosed());
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}
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@Test public void failAndResetTest() throws Exception {
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try {
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cb.invoke( new FailingInvocation() );
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}catch (Exception e) {}
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cb.invoke(new SucceedingInvocation() ); //after one good it should reset back to closed
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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 normalOpenTest() throws Exception {
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try{
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cb.invoke( new FailingInvocation() );
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} catch (IOException e) {}
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try{
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cb.invoke( new FailingInvocation() );
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} catch (IOException e) {}
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assertTrue( cb.isOpen() );
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}
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@Test public void forcedResetTest() throws Exception {
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try{
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cb.invoke( new FailingInvocation() );
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} catch (IOException e) {}
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try{
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cb.invoke( new FailingInvocation() );
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} catch (IOException e) {}
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cb.reset();
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assertTrue( cb.isClosed() );
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assertTrue( cb.getFailureCount() == 0 ); //TODO: 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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}
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