org.zalando.zmon.actuator.backend.ZmonRestBackendMetricsTest.java Source code

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Here is the source code for org.zalando.zmon.actuator.backend.ZmonRestBackendMetricsTest.java

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/**
 * Copyright (C) 2015 Zalando SE (http://tech.zalando.com)
 *
 * 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.zalando.zmon.actuator.backend;

import static org.assertj.core.api.Assertions.assertThat;

import static com.github.tomakehurst.wiremock.client.WireMock.aResponse;
import static com.github.tomakehurst.wiremock.client.WireMock.delete;
import static com.github.tomakehurst.wiremock.client.WireMock.stubFor;
import static com.github.tomakehurst.wiremock.client.WireMock.urlEqualTo;

import java.util.Random;
import java.util.concurrent.TimeUnit;

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;

import org.junit.runner.RunWith;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;

import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.boot.test.WebIntegrationTest;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import org.springframework.http.HttpStatus;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import org.springframework.web.client.RestTemplate;

import org.zalando.zmon.actuator.ExampleApplication;

import com.codahale.metrics.ConsoleReporter;
import com.codahale.metrics.MetricRegistry;

import com.github.tomakehurst.wiremock.client.WireMock;
import com.github.tomakehurst.wiremock.junit.WireMockRule;

/**
 * @author  jbellmann
 */
@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = { ExampleApplication.class })
@WebIntegrationTest(randomPort = true, value = { "debug=false" })
public class ZmonRestBackendMetricsTest {

    public static final int REPEATS = 100;
    private final Logger logger = LoggerFactory.getLogger(ZmonRestBackendMetricsTest.class);

    @Value("${local.server.port}")
    private int port;

    @Autowired
    private MetricRegistry metricRegistry;

    private RestTemplate externalClient = new RestTemplate();

    private final Random random = new Random(System.currentTimeMillis());

    @Rule
    public final WireMockRule wireMockRule = new WireMockRule(9999);

    @Before
    public void setUp() {
        ConsoleReporter reporter = ConsoleReporter.forRegistry(metricRegistry).convertRatesTo(TimeUnit.SECONDS)
                .convertDurationsTo(TimeUnit.MILLISECONDS).build();
        reporter.start(2, TimeUnit.SECONDS);
        expectDeleteCall();
    }

    @Test
    public void test() throws InterruptedException {
        for (int i = 0; i < REPEATS; i++) {

            externalClient.getForObject("http://localhost:" + port + "/timeConsumingCall", String.class);
            TimeUnit.MILLISECONDS.sleep(random.nextInt(30));
        }

        assertThat(metricRegistry.getTimers().get("zmon.request.204.DELETE.localhost:9999")).isNotNull();

        String metricsEndpointResponse = externalClient.getForObject("http://localhost:" + port + "/metrics",
                String.class);

        logger.info(metricsEndpointResponse);
    }

    private void expectDeleteCall() {
        WireMock.addRequestProcessingDelay(200);
        stubFor(delete(urlEqualTo("/something"))
                .willReturn(aResponse().withStatus(HttpStatus.NO_CONTENT.value()).withFixedDelay(100)));
    }

    @Configuration
    public static class BackendIntegratedConfiguration {

        @Bean
        public RestTemplate backendCallingBean() {
            return new RestTemplate();
        }
    }

}