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Add Jackson Smile support to WebFlux
This binary format more efficient than JSON should be useful for server to server communication, for example in micro-services use cases. Issue: SPR-15424
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149 changes: 149 additions & 0 deletions
149
spring-web/src/main/java/org/springframework/http/codec/json/AbstractJackson2Decoder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,149 @@ | ||
| /* | ||
| * Copyright 2002-2017 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 org.springframework.http.codec.json; | ||
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| import java.io.IOException; | ||
| import java.io.UncheckedIOException; | ||
| import java.lang.annotation.Annotation; | ||
| import java.util.Map; | ||
|
|
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| import com.fasterxml.jackson.core.JsonFactory; | ||
| import com.fasterxml.jackson.core.JsonParser; | ||
| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.JavaType; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import com.fasterxml.jackson.databind.ObjectReader; | ||
| import com.fasterxml.jackson.databind.exc.InvalidDefinitionException; | ||
| import com.fasterxml.jackson.databind.util.TokenBuffer; | ||
| import org.reactivestreams.Publisher; | ||
| import reactor.core.publisher.Flux; | ||
| import reactor.core.publisher.Mono; | ||
|
|
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| import org.springframework.core.MethodParameter; | ||
| import org.springframework.core.ResolvableType; | ||
| import org.springframework.core.codec.CodecException; | ||
| import org.springframework.core.codec.DecodingException; | ||
| import org.springframework.core.io.buffer.DataBuffer; | ||
| import org.springframework.http.codec.HttpMessageDecoder; | ||
| import org.springframework.http.server.reactive.ServerHttpRequest; | ||
| import org.springframework.http.server.reactive.ServerHttpResponse; | ||
| import org.springframework.lang.Nullable; | ||
| import org.springframework.util.Assert; | ||
| import org.springframework.util.MimeType; | ||
|
|
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| /** | ||
| * Base class providing support methods for Jackson 2.9 decoding. | ||
| * | ||
| * @author Sebastien Deleuze | ||
| * @author Rossen Stoyanchev | ||
| * @since 5.0 | ||
| */ | ||
| public abstract class AbstractJackson2Decoder extends Jackson2CodecSupport implements HttpMessageDecoder<Object> { | ||
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|
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| /** | ||
| * Constructor with a Jackson {@link ObjectMapper} to use. | ||
| */ | ||
| protected AbstractJackson2Decoder(ObjectMapper mapper, MimeType... mimeTypes) { | ||
| super(mapper, mimeTypes); | ||
| } | ||
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| @Override | ||
| public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) { | ||
| JavaType javaType = objectMapper().getTypeFactory().constructType(elementType.getType()); | ||
| // Skip String: CharSequenceDecoder + "*/*" comes after | ||
| return (!CharSequence.class.isAssignableFrom(elementType.resolve(Object.class)) && | ||
| objectMapper().canDeserialize(javaType) && supportsMimeType(mimeType)); | ||
| } | ||
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| @Override | ||
| public Flux<Object> decode(Publisher<DataBuffer> input, ResolvableType elementType, | ||
| @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) { | ||
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| Flux<TokenBuffer> tokens = tokenize(input, true); | ||
| return decodeInternal(tokens, elementType, mimeType, hints); | ||
| } | ||
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| @Override | ||
| public Mono<Object> decodeToMono(Publisher<DataBuffer> input, ResolvableType elementType, | ||
| @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) { | ||
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| Flux<TokenBuffer> tokens = tokenize(input, false); | ||
| return decodeInternal(tokens, elementType, mimeType, hints).singleOrEmpty(); | ||
| } | ||
|
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| private Flux<TokenBuffer> tokenize(Publisher<DataBuffer> input, boolean tokenizeArrayElements) { | ||
| try { | ||
| JsonFactory factory = objectMapper().getFactory(); | ||
| JsonParser nonBlockingParser = factory.createNonBlockingByteArrayParser(); | ||
| Jackson2Tokenizer tokenizer = new Jackson2Tokenizer(nonBlockingParser, | ||
| tokenizeArrayElements); | ||
| return Flux.from(input) | ||
| .flatMap(tokenizer) | ||
| .doFinally(t -> tokenizer.endOfInput()); | ||
| } | ||
| catch (IOException ex) { | ||
| return Flux.error(new UncheckedIOException(ex)); | ||
| } | ||
|
|
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| } | ||
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| private Flux<Object> decodeInternal(Flux<TokenBuffer> tokens, | ||
| ResolvableType elementType, @Nullable MimeType mimeType, | ||
| @Nullable Map<String, Object> hints) { | ||
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| Assert.notNull(tokens, "'tokens' must not be null"); | ||
| Assert.notNull(elementType, "'elementType' must not be null"); | ||
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| MethodParameter param = getParameter(elementType); | ||
| Class<?> contextClass = (param != null ? param.getContainingClass() : null); | ||
| JavaType javaType = getJavaType(elementType.getType(), contextClass); | ||
| Class<?> jsonView = (hints != null ? (Class<?>) hints.get(Jackson2CodecSupport.JSON_VIEW_HINT) : null); | ||
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| ObjectReader reader = (jsonView != null ? | ||
| objectMapper().readerWithView(jsonView).forType(javaType) : | ||
| objectMapper().readerFor(javaType)); | ||
|
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| return tokens.map(tokenBuffer -> { | ||
| try { | ||
| return reader.readValue(tokenBuffer.asParser()); | ||
| } | ||
| catch (InvalidDefinitionException ex) { | ||
| throw new CodecException("Type definition error: " + ex.getType(), ex); | ||
| } | ||
| catch (JsonProcessingException ex) { | ||
| throw new DecodingException("JSON decoding error: " + ex.getOriginalMessage(), ex); | ||
| } | ||
| catch (IOException ex) { | ||
| throw new DecodingException("I/O error while parsing input stream", ex); | ||
| } | ||
| }); | ||
| } | ||
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| // HttpMessageDecoder... | ||
|
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| @Override | ||
| public Map<String, Object> getDecodeHints(ResolvableType actualType, ResolvableType elementType, | ||
| ServerHttpRequest request, ServerHttpResponse response) { | ||
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| return getHints(actualType); | ||
| } | ||
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| @Override | ||
| protected <A extends Annotation> A getAnnotation(MethodParameter parameter, Class<A> annotType) { | ||
| return parameter.getParameterAnnotation(annotType); | ||
| } | ||
| } |
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