libraries/circuitbreaker/src/test/java/org/apache/zest/library/circuitbreaker/BreaksCircuitOnThrowableTest.java

/*
 * Copyright 2009-2010 Rickard Öberg AB
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.zest.library.circuitbreaker;

import java.beans.PropertyVetoException;
import org.junit.Assert;
import org.junit.Test;
import org.apache.zest.api.mixin.Mixins;
import org.apache.zest.api.service.ServiceComposite;
import org.apache.zest.api.service.ServiceReference;
import org.apache.zest.bootstrap.AssemblyException;
import org.apache.zest.bootstrap.ModuleAssembly;
import org.apache.zest.library.circuitbreaker.service.AbstractBreakOnThrowable;
import org.apache.zest.library.circuitbreaker.service.BreaksCircuitOnThrowable;
import org.apache.zest.test.AbstractQi4jTest;

/**
 * Test @BreaksCircuitOnThrowable annotation
 */
public class BreaksCircuitOnThrowableTest
        extends AbstractQi4jTest
{

    // START SNIPPET: service
    public void assemble( ModuleAssembly module )
            throws AssemblyException
    {
        module.services( TestService.class ).setMetaInfo( new CircuitBreaker() );
    }
    // END SNIPPET: service

    @Test
    public void testSuccess()
    {
        TestService service = ( TestService ) module.findService( TestService.class ).get();
        service.successfulMethod();
        service.successfulMethod();
        service.successfulMethod();
    }

    @Test
    public void testThrowable()
    {
        ServiceReference<TestService> serviceReference = module.findService( TestService.class );
        TestService service = serviceReference.get();
        try {
            service.throwingMethod();
            Assert.fail( "Service should have thrown exception" );
        } catch ( Exception e ) {
            // Ok
        }

        try {
            service.successfulMethod();
            Assert.fail( "Circuit breaker should have tripped" );
        } catch ( Exception e ) {
            // Ok
        }

        try {
            serviceReference.metaInfo( CircuitBreaker.class ).turnOn();
        } catch ( PropertyVetoException e ) {
            Assert.fail( "Should have been possible to turn on circuit breaker" );
        }

        try {
            service.successfulMethod();
        } catch ( Exception e ) {
            Assert.fail( "Circuit breaker should have been turned on" );
        }
    }

    @Mixins( TestService.Mixin.class )
    // START SNIPPET: service
    public interface TestService
            extends AbstractBreakOnThrowable, ServiceComposite
    {

        @BreaksCircuitOnThrowable
        int successfulMethod();

        @BreaksCircuitOnThrowable
        void throwingMethod();

        // END SNIPPET: service
        abstract class Mixin
                implements TestService
        {

            int count = 0;

            public void throwingMethod()
            {
                throw new IllegalArgumentException( "Failed" );
            }

            public int successfulMethod()
            {
                return count++;
            }

        }

        // START SNIPPET: service
    }
    // END SNIPPET: service

}