io.spring.initializr.actuate.stat.ProjectGenerationStatPublisher.java Source code

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Here is the source code for io.spring.initializr.actuate.stat.ProjectGenerationStatPublisher.java

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/*
 * Copyright 2012-2017 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 io.spring.initializr.actuate.stat;

import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import io.spring.initializr.generator.ProjectRequestEvent;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.event.EventListener;
import org.springframework.http.MediaType;
import org.springframework.http.RequestEntity;
import org.springframework.retry.RetryCallback;
import org.springframework.retry.support.RetryTemplate;
import org.springframework.scheduling.annotation.Async;
import org.springframework.web.client.RestTemplate;

/**
 * Publish stats for each project generated to an Elastic index.
 *
 * @author Stephane Nicoll
 */
public class ProjectGenerationStatPublisher {

    private static final Logger log = LoggerFactory.getLogger(ProjectGenerationStatPublisher.class);

    private final ProjectRequestDocumentFactory documentFactory;
    private final StatsProperties statsProperties;
    private final ObjectMapper objectMapper;
    private final RestTemplate restTemplate;
    private final RetryTemplate retryTemplate;

    public ProjectGenerationStatPublisher(ProjectRequestDocumentFactory documentFactory,
            StatsProperties statsProperties, RetryTemplate retryTemplate) {
        this.documentFactory = documentFactory;
        this.statsProperties = statsProperties;
        this.objectMapper = createObjectMapper();
        this.restTemplate = new RestTemplateBuilder().basicAuthorization(statsProperties.getElastic().getUsername(),
                statsProperties.getElastic().getPassword()).build();
        this.retryTemplate = retryTemplate;
    }

    @EventListener
    @Async
    public void handleEvent(ProjectRequestEvent event) {
        String json = null;
        try {
            ProjectRequestDocument document = documentFactory.createDocument(event);
            if (log.isDebugEnabled()) {
                log.debug("Publishing " + document);
            }
            json = toJson(document);

            RequestEntity<String> request = RequestEntity.post(this.statsProperties.getElastic().getEntityUrl())
                    .contentType(MediaType.APPLICATION_JSON).body(json);

            this.retryTemplate.execute((RetryCallback<Void, RuntimeException>) context -> {
                restTemplate.exchange(request, String.class);
                return null;
            });
        } catch (Exception ex) {
            log.warn(String.format("Failed to publish stat to index, document follows %n%n%s%n", json), ex);
        }
    }

    private String toJson(ProjectRequestDocument stats) {
        try {
            return this.objectMapper.writeValueAsString(stats);
        } catch (JsonProcessingException ex) {
            throw new IllegalStateException("Cannot convert to JSON", ex);
        }
    }

    private static ObjectMapper createObjectMapper() {
        ObjectMapper mapper = new ObjectMapper();
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        return mapper;
    }

    protected RestTemplate getRestTemplate() {
        return this.restTemplate;
    }

}