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StreamDecoder.java
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106 lines (93 loc) · 3.16 KB
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/**
* Copyright 2012-2020 The Feign 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 feign.stream;
import feign.FeignException;
import feign.Response;
import feign.codec.Decoder;
import java.io.Closeable;
import java.io.IOException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Iterator;
import java.util.Spliterators;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import static feign.Util.ensureClosed;
/**
* Iterator based decoder that support streaming.
* <p>
* <p>
* Example: <br>
*
* <pre>
* <code>
* Feign.builder()
* .decoder(StreamDecoder.create(JacksonIteratorDecoder.create()))
* .doNotCloseAfterDecode() // Required for streaming
* .target(GitHub.class, "https://api.github.com");
* interface GitHub {
* {@literal @}RequestLine("GET /repos/{owner}/{repo}/contributors")
* Stream<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);
* }</code>
* </pre>
*/
public final class StreamDecoder implements Decoder {
private final Decoder iteratorDecoder;
StreamDecoder(Decoder iteratorDecoder) {
this.iteratorDecoder = iteratorDecoder;
}
@Override
public Object decode(Response response, Type type)
throws IOException, FeignException {
if (!(type instanceof ParameterizedType)) {
throw new IllegalArgumentException("StreamDecoder supports only stream: unknown " + type);
}
ParameterizedType streamType = (ParameterizedType) type;
if (!Stream.class.equals(streamType.getRawType())) {
throw new IllegalArgumentException("StreamDecoder supports only stream: unknown " + type);
}
Iterator<?> iterator =
(Iterator) iteratorDecoder.decode(response, new IteratorParameterizedType(streamType));
return StreamSupport.stream(
Spliterators.spliteratorUnknownSize(iterator, 0), false)
.onClose(() -> {
if (iterator instanceof Closeable) {
ensureClosed((Closeable) iterator);
} else {
ensureClosed(response);
}
});
}
public static StreamDecoder create(Decoder iteratorDecoder) {
return new StreamDecoder(iteratorDecoder);
}
static final class IteratorParameterizedType implements ParameterizedType {
private final ParameterizedType streamType;
IteratorParameterizedType(ParameterizedType streamType) {
this.streamType = streamType;
}
@Override
public Type[] getActualTypeArguments() {
return streamType.getActualTypeArguments();
}
@Override
public Type getRawType() {
return Iterator.class;
}
@Override
public Type getOwnerType() {
return null;
}
}
}