org.springframework.cloud.sleuth.instrument.multiple.DemoApplication.java Source code

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Here is the source code for org.springframework.cloud.sleuth.instrument.multiple.DemoApplication.java

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/*
 * Copyright 2013-2018 the original author or authors.
 *
 * 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.springframework.cloud.sleuth.instrument.multiple;

import java.util.Arrays;
import java.util.List;

import brave.Span;
import brave.Tracer;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.integration.annotation.Aggregator;
import org.springframework.integration.annotation.Gateway;
import org.springframework.integration.annotation.IntegrationComponentScan;
import org.springframework.integration.annotation.MessageEndpoint;
import org.springframework.integration.annotation.MessagingGateway;
import org.springframework.integration.annotation.ServiceActivator;
import org.springframework.integration.annotation.Splitter;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.RequestHeader;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@MessageEndpoint
@IntegrationComponentScan
public class DemoApplication {

    private static final Log log = LogFactory.getLog(DemoApplication.class);

    Span httpSpan;

    Span splitterSpan;

    Span aggregatorSpan;

    Span serviceActivatorSpan;

    @Autowired
    Sender sender;

    @Autowired
    Tracer tracer;

    @RequestMapping("/greeting")
    public Greeting greeting(@RequestParam(defaultValue = "Hello World!") String message,
            @RequestHeader HttpHeaders headers) {
        this.sender.send(message);
        this.httpSpan = this.tracer.currentSpan();
        return new Greeting(message);
    }

    @Splitter(inputChannel = "greetings", outputChannel = "words")
    public List<String> words(String greeting) {
        this.splitterSpan = this.tracer.currentSpan();
        return Arrays.asList(StringUtils.delimitedListToStringArray(greeting, " "));
    }

    @Aggregator(inputChannel = "words", outputChannel = "counts")
    public int count(List<String> greeting) {
        this.aggregatorSpan = this.tracer.currentSpan();
        return greeting.size();
    }

    @ServiceActivator(inputChannel = "counts")
    public void report(int count) {
        this.serviceActivatorSpan = this.tracer.currentSpan();
        log.info("Count: " + count);
    }

    public Span getHttpSpan() {
        return this.httpSpan;
    }

    public Span getSplitterSpan() {
        return this.splitterSpan;
    }

    public Span getAggregatorSpan() {
        return this.aggregatorSpan;
    }

    public Span getServiceActivatorSpan() {
        return this.serviceActivatorSpan;
    }

    public List<Span> allSpans() {
        return Arrays.asList(this.httpSpan, this.splitterSpan, this.aggregatorSpan, this.serviceActivatorSpan);
    }

}

@MessagingGateway(name = "greeter")
interface Sender {

    @Gateway(requestChannel = "greetings")
    void send(String message);

}

class Greeting {

    private String message;

    Greeting() {
    }

    public Greeting(String message) {
        super();
        this.message = message;
    }

    public String getMessage() {
        return this.message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

}