/*
* Copyright 2002-2016 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.http.client.reactive;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Supplier;
import reactor.core.publisher.Mono;
import org.springframework.http.HttpCookie;
import org.springframework.http.HttpHeaders;
import org.springframework.util.Assert;
import org.springframework.util.CollectionUtils;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
/**
* Base class for {@link ClientHttpRequest} implementations.
*
* @author Rossen Stoyanchev
* @author Brian Clozel
*/
public abstract class AbstractClientHttpRequest implements ClientHttpRequest {
private final HttpHeaders headers;
private final MultiValueMap<String, HttpCookie> cookies;
private AtomicReference<State> state = new AtomicReference<>(State.NEW);
private final List<Supplier<? extends Mono<Void>>> beforeCommitActions = new ArrayList<>(4);
public AbstractClientHttpRequest() {
this(new HttpHeaders());
}
public AbstractClientHttpRequest(HttpHeaders headers) {
Assert.notNull(headers);
this.headers = headers;
this.cookies = new LinkedMultiValueMap<>();
}
@Override
public HttpHeaders getHeaders() {
if (State.COMITTED.equals(this.state.get())) {
return HttpHeaders.readOnlyHttpHeaders(this.headers);
}
return this.headers;
}
@Override
public MultiValueMap<String, HttpCookie> getCookies() {
if (State.COMITTED.equals(this.state.get())) {
return CollectionUtils.unmodifiableMultiValueMap(this.cookies);
}
return this.cookies;
}
protected Mono<Void> applyBeforeCommit() {
Mono<Void> mono = Mono.empty();
if (this.state.compareAndSet(State.NEW, State.COMMITTING)) {
for (Supplier<? extends Mono<Void>> action : this.beforeCommitActions) {
mono = mono.then(() -> action.get());
}
return mono
.otherwise(ex -> {
// Ignore errors from beforeCommit actions
return Mono.empty();
})
.then(() -> {
this.state.set(State.COMITTED);
writeHeaders();
writeCookies();
return Mono.empty();
});
}
return mono;
}
@Override
public void beforeCommit(Supplier<? extends Mono<Void>> action) {
Assert.notNull(action);
this.beforeCommitActions.add(action);
}
protected abstract void writeHeaders();
protected abstract void writeCookies();
private enum State {NEW, COMMITTING, COMITTED}
}