org.springframework.web.reactive.function.client.ExchangeFunctions Maven / Gradle / Ivy
/*
* Copyright 2002-2018 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.web.reactive.function.client;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import reactor.core.publisher.Mono;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.reactive.ClientHttpConnector;
import org.springframework.util.Assert;
/**
* Exposes request-response exchange functionality, such as to
* {@linkplain #create(ClientHttpConnector) create} an {@code ExchangeFunction} given a
* {@code ClientHttpConnector}.
*
* @author Arjen Poutsma
* @author Rossen Stoyanchev
* @since 5.0
*/
public abstract class ExchangeFunctions {
private static final Log logger = LogFactory.getLog(ExchangeFunctions.class);
/**
* Create a new {@link ExchangeFunction} with the given connector. This method uses
* {@linkplain ExchangeStrategies#withDefaults() default strategies}.
* @param connector the connector to create connections
* @return the created function
*/
public static ExchangeFunction create(ClientHttpConnector connector) {
return create(connector, ExchangeStrategies.withDefaults());
}
/**
* Create a new {@link ExchangeFunction} with the given connector and strategies.
* @param connector the connector to create connections
* @param strategies the strategies to use
* @return the created function
*/
public static ExchangeFunction create(ClientHttpConnector connector, ExchangeStrategies strategies) {
Assert.notNull(connector, "ClientHttpConnector must not be null");
Assert.notNull(strategies, "ExchangeStrategies must not be null");
return new DefaultExchangeFunction(connector, strategies);
}
private static class DefaultExchangeFunction implements ExchangeFunction {
private final ClientHttpConnector connector;
private final ExchangeStrategies strategies;
public DefaultExchangeFunction(ClientHttpConnector connector, ExchangeStrategies strategies) {
this.connector = connector;
this.strategies = strategies;
}
@Override
public Mono exchange(ClientRequest request) {
Assert.notNull(request, "ClientRequest must not be null");
return this.connector
.connect(request.method(), request.url(),
clientHttpRequest -> request.writeTo(clientHttpRequest, this.strategies))
.doOnSubscribe(subscription -> logger.debug("Subscriber present"))
.doOnRequest(n -> logger.debug("Demand signaled"))
.doOnCancel(() -> logger.debug("Cancelling request"))
.map(response -> {
if (logger.isDebugEnabled()) {
int status = response.getRawStatusCode();
HttpStatus resolvedStatus = HttpStatus.resolve(status);
logger.debug("Response received, status: " + status +
(resolvedStatus != null ? " " + resolvedStatus.getReasonPhrase() : ""));
}
return new DefaultClientResponse(response, this.strategies);
});
}
}
}