it.polimi.diceH2020.launcher.service.RestCommunicationWrapper.java Source code

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Here is the source code for it.polimi.diceH2020.launcher.service.RestCommunicationWrapper.java

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/*
Copyright 2017 Eugenio Gianniti
Copyright 2016 Jacopo Rigoli
    
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 it.polimi.diceH2020.launcher.service;

import org.springframework.http.client.SimpleClientHttpRequestFactory;
import org.springframework.retry.annotation.Backoff;
import org.springframework.retry.annotation.Retryable;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestClientException;
import org.springframework.web.client.RestTemplate;

/**
 * <strong>Wrap main RestTemplate functions to add @Retryable</strong> <br>
 * Useful for prototype components that can't support it.
 *
 * @author Jacopo Rigoli
 * @see RestTemplate
 * @see Retryable
 *
 */
@Service
public class RestCommunicationWrapper {

    private static final int maxRequests = 5;
    private static final int delayRequests = 5000; // [ms]
    private static final double multiplierRequests = 1.5;

    private RestTemplate restTemplate;

    public RestCommunicationWrapper() {
        restTemplate = new RestTemplate();
        SimpleClientHttpRequestFactory requestFactory = new SimpleClientHttpRequestFactory();
        // To avoid running out of memory
        requestFactory.setBufferRequestBody(false);
        restTemplate.setRequestFactory(requestFactory);
    }

    @Retryable(maxAttempts = maxRequests, backoff = @Backoff(delay = delayRequests, multiplier = multiplierRequests))
    public <T> T postForObject(String url, Object request, Class<T> responseType) throws RestClientException {
        return restTemplate.postForObject(url, request, responseType);
    }

    @Retryable(maxAttempts = maxRequests, backoff = @Backoff(delay = delayRequests, multiplier = multiplierRequests))
    public <T> T getForObject(String url, Class<T> responseType) throws RestClientException {
        return restTemplate.getForObject(url, responseType);
    }
}