/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.camel.processor;
import java.util.concurrent.RejectedExecutionException;
import org.apache.camel.ContextTestSupport;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import static org.apache.camel.component.mock.MockEndpoint.expectsMessageCount;
public class CircuitBreakerLoadBalancerTest extends ContextTestSupport {
private static class MyCustomException extends RuntimeException {
private static final long serialVersionUID = 1L;
}
private MockEndpoint result;
@Override
protected void setUp() throws Exception {
super.setUp();
result = getMockEndpoint("mock:result");
}
protected RouteBuilder createRouteBuilder() {
return new RouteBuilder() {
public void configure() {
from("direct:start").loadBalance()
.circuitBreaker(2, 1000L, MyCustomException.class)
.to("mock:result");
from("direct:start-async").loadBalance()
.circuitBreaker(2, 1000L, MyCustomException.class)
.threads(1).to("mock:result");
}
};
}
public void testClosedCircuitPassesMessagesSync() throws Exception {
String endpoint = "direct:start";
closedCircuitPassesMessages(endpoint);
}
public void testClosedCircuitPassesMessagesAsync() throws Exception {
String endpoint = "direct:start-async";
closedCircuitPassesMessages(endpoint);
}
private void closedCircuitPassesMessages(String endpoint) throws InterruptedException, Exception {
expectsMessageCount(3, result);
sendMessage(endpoint, "message one");
sendMessage(endpoint, "message two");
sendMessage(endpoint, "message three");
assertMockEndpointsSatisfied();
}
public void testFailedMessagesOpenCircuitToPreventMessageThreeSync() throws Exception {
String endpoint = "direct:start";
failedMessagesOpenCircuitToPreventMessageThree(endpoint);
}
public void testFailedMessagesOpenCircuitToPreventMessageThreeAsync() throws Exception {
String endpoint = "direct:start-async";
failedMessagesOpenCircuitToPreventMessageThree(endpoint);
}
private void failedMessagesOpenCircuitToPreventMessageThree(String endpoint) throws InterruptedException, Exception {
expectsMessageCount(2, result);
result.whenAnyExchangeReceived(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
exchange.setException(new MyCustomException());
}
});
Exchange exchangeOne = sendMessage(endpoint, "message one");
Exchange exchangeTwo = sendMessage(endpoint, "message two");
Exchange exchangeThree = sendMessage(endpoint, "message three");
assertMockEndpointsSatisfied();
assertTrue(exchangeOne.getException() instanceof MyCustomException);
assertTrue(exchangeTwo.getException() instanceof MyCustomException);
assertTrue(exchangeThree.getException() instanceof RejectedExecutionException);
}
public void testHalfOpenCircuitClosesAfterTimeoutSync() throws Exception {
String endpoint = "direct:start";
halfOpenCircuitClosesAfterTimeout(endpoint);
}
public void testHalfOpenCircuitClosesAfterTimeoutAsync() throws Exception {
String endpoint = "direct:start-async";
halfOpenCircuitClosesAfterTimeout(endpoint);
}
private void halfOpenCircuitClosesAfterTimeout(String endpoint) throws InterruptedException, Exception {
expectsMessageCount(2, result);
result.whenAnyExchangeReceived(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
exchange.setException(new MyCustomException());
}
});
sendMessage(endpoint, "message one");
sendMessage(endpoint, "message two");
sendMessage(endpoint, "message three");
assertMockEndpointsSatisfied();
result.reset();
expectsMessageCount(1, result);
Thread.sleep(1000);
sendMessage(endpoint, "message four");
assertMockEndpointsSatisfied();
}
protected Exchange sendMessage(final String endpoint, final Object body) throws Exception {
return template.send(endpoint, new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
exchange.getIn().setBody(body);
}
});
}
}