components/camel-micrometer/src/test/java/org/apache/camel/component/micrometer/messagehistory/MicrometerMessageHistoryTest.java

/*
 * 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.
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package org.apache.camel.component.micrometer.messagehistory;

import io.micrometer.core.instrument.MeterRegistry;
import io.micrometer.core.instrument.Timer;
import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
import org.apache.camel.CamelContext;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.test.junit4.CamelTestSupport;
import org.junit.Test;
import static org.apache.camel.component.micrometer.MicrometerConstants.DEFAULT_CAMEL_MESSAGE_HISTORY_METER_NAME;
import static org.apache.camel.component.micrometer.MicrometerConstants.NODE_ID_TAG;

public class MicrometerMessageHistoryTest extends CamelTestSupport {

    private MeterRegistry registry = new SimpleMeterRegistry();

    @Override
    protected CamelContext createCamelContext() throws Exception {
        CamelContext context = super.createCamelContext();

        MicrometerMessageHistoryFactory factory = new MicrometerMessageHistoryFactory();
        factory.setMeterRegistry(registry);
        factory.setPrettyPrint(true);
        context.setMessageHistoryFactory(factory);

        return context;
    }

    @Test
    public void testMetricsHistory() throws Exception {
        int count = 10;

        getMockEndpoint("mock:foo").expectedMessageCount(count / 2);
        getMockEndpoint("mock:bar").expectedMessageCount(count / 2);
        getMockEndpoint("mock:baz").expectedMessageCount(count / 2);

        for (int i = 0; i < count; i++) {
            if (i % 2 == 0) {
                template.sendBody("direct:foo", "Hello " + i);
            } else {
                template.sendBody("direct:bar", "Hello " + i);
            }
        }

        assertMockEndpointsSatisfied();

        // there should be 3 names
        assertEquals(3, registry.getMeters().size());

        Timer fooTimer = registry.find(DEFAULT_CAMEL_MESSAGE_HISTORY_METER_NAME).tag(NODE_ID_TAG, "foo").timer();
        assertEquals(count / 2, fooTimer.count());
        Timer barTimer = registry.find(DEFAULT_CAMEL_MESSAGE_HISTORY_METER_NAME).tag(NODE_ID_TAG, "bar").timer();
        assertEquals(count / 2, barTimer.count());
        Timer bazTimer = registry.find(DEFAULT_CAMEL_MESSAGE_HISTORY_METER_NAME).tag(NODE_ID_TAG, "baz").timer();
        assertEquals(count / 2, bazTimer.count());

        // get the message history service
        MicrometerMessageHistoryService service = context.hasService(MicrometerMessageHistoryService.class);
        assertNotNull(service);
        String json = service.dumpStatisticsAsJson();
        assertNotNull(json);
        log.info(json);

        assertTrue(json.contains("\"nodeId\" : \"foo\""));
        assertTrue(json.contains("\"nodeId\" : \"bar\""));
        assertTrue(json.contains("\"nodeId\" : \"baz\""));
    }

    @Override
    protected RouteBuilder createRouteBuilder() {
        return new RouteBuilder() {
            @Override
            public void configure() {
                from("direct:foo")
                    .to("mock:foo").id("foo");

                from("direct:bar")
                    .to("mock:bar").id("bar")
                    .to("mock:baz").id("baz");
            }
        };
    }
}