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Added DataBuffer Encoder/Decoder

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This commit adds a DataBuffer Encoder and Decoder, and uses it in
the annotation-based processing model.

Note that these codecs are not used in the functional processing model,
since the BodyInserter/BodyExtractor already have methods for
writing/reading DataBuffers.

Issue: SPR-15148
This commit is contained in:
Arjen Poutsma
2017-01-17 16:19:25 +01:00
parent 141e04aa0f
commit 88c5f5981f
8 changed files with 263 additions and 10 deletions
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57
spring-core/src/main/java/org/springframework/core/codec/DataBufferDecoder.java Normal file
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/*
* 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.core.codec;
import java.util.Map;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
/**
* Simple pass-through decoder for {@link DataBuffer}s.
* <p><strong>Note</strong> that the "decoded" buffers returned by instances of this class should
* be released after usage by calling
* {@link org.springframework.core.io.buffer.DataBufferUtils#release(DataBuffer)}.
*
* @author Arjen Poutsma
* @since 5.0
*/
public class DataBufferDecoder extends AbstractDecoder<DataBuffer> {
public DataBufferDecoder() {
super(MimeTypeUtils.ALL);
}
@Override
public boolean canDecode(ResolvableType elementType, MimeType mimeType) {
Class<?> clazz = elementType.getRawClass();
return (super.canDecode(elementType, mimeType) && DataBuffer.class.isAssignableFrom(clazz));
}
@Override
public Flux<DataBuffer> decode(Publisher<DataBuffer> inputStream, ResolvableType elementType,
MimeType mimeType, Map<String, Object> hints) {
return Flux.from(inputStream);
}
}

57
spring-core/src/main/java/org/springframework/core/codec/DataBufferEncoder.java Normal file
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/*
* 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.core.codec;
import java.util.Map;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.util.MimeType;
import org.springframework.util.MimeTypeUtils;
/**
* Simple pass-through encoder for {@link DataBuffer}s.
*
* @author Arjen Poutsma
* @since 5.0
*/
public class DataBufferEncoder extends AbstractEncoder<DataBuffer> {
public DataBufferEncoder() {
super(MimeTypeUtils.ALL);
}
@Override
public boolean canEncode(ResolvableType elementType, MimeType mimeType) {
Class<?> clazz = elementType.getRawClass();
return (super.canEncode(elementType, mimeType) && DataBuffer.class.isAssignableFrom(clazz));
}
@Override
public Flux<DataBuffer> encode(Publisher<? extends DataBuffer> inputStream,
DataBufferFactory bufferFactory, ResolvableType elementType, MimeType mimeType,
Map<String, Object> hints) {
return Flux.from(inputStream);
}
}

63
spring-core/src/test/java/org/springframework/core/codec/DataBufferDecoderTests.java Normal file
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/*
* 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.core.codec;
import java.nio.ByteBuffer;
import java.util.Collections;
import org.junit.Test;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.buffer.AbstractDataBufferAllocatingTestCase;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.util.MimeTypeUtils;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
/**
* @author Sebastien Deleuze
*/
public class DataBufferDecoderTests extends AbstractDataBufferAllocatingTestCase {
private final DataBufferDecoder decoder = new DataBufferDecoder();
@Test
public void canDecode() {
assertTrue(this.decoder.canDecode(ResolvableType.forClass(DataBuffer.class),
MimeTypeUtils.TEXT_PLAIN));
assertFalse(this.decoder.canDecode(ResolvableType.forClass(Integer.class),
MimeTypeUtils.TEXT_PLAIN));
assertTrue(this.decoder.canDecode(ResolvableType.forClass(DataBuffer.class),
MimeTypeUtils.APPLICATION_JSON));
}
@Test
public void decode() {
DataBuffer fooBuffer = stringBuffer("foo");
DataBuffer barBuffer = stringBuffer("bar");
Flux<DataBuffer> source = Flux.just(fooBuffer, barBuffer);
Flux<DataBuffer> output = this.decoder.decode(source,
ResolvableType.forClassWithGenerics(Publisher.class, ByteBuffer.class),
null, Collections.emptyMap());
assertSame(source, output);
}
}

65
spring-core/src/test/java/org/springframework/core/codec/DataBufferEncoderTests.java Normal file
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/*
* 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.core.codec;
import java.nio.ByteBuffer;
import java.util.Collections;
import org.junit.Test;
import org.reactivestreams.Publisher;
import reactor.core.publisher.Flux;
import org.springframework.core.ResolvableType;
import org.springframework.core.io.buffer.AbstractDataBufferAllocatingTestCase;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.util.MimeTypeUtils;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertSame;
import static org.junit.Assert.assertTrue;
/**
* @author Sebastien Deleuze
*/
public class DataBufferEncoderTests extends AbstractDataBufferAllocatingTestCase {
private final DataBufferEncoder encoder = new DataBufferEncoder();
@Test
public void canEncode() {
assertTrue(this.encoder.canEncode(ResolvableType.forClass(DataBuffer.class),
MimeTypeUtils.TEXT_PLAIN));
assertFalse(this.encoder.canEncode(ResolvableType.forClass(Integer.class),
MimeTypeUtils.TEXT_PLAIN));
assertTrue(this.encoder.canEncode(ResolvableType.forClass(DataBuffer.class),
MimeTypeUtils.APPLICATION_JSON));
}
@Test
public void encode() {
DataBuffer fooBuffer = stringBuffer("foo");
DataBuffer barBuffer = stringBuffer("bar");
Flux<DataBuffer> source = Flux.just(fooBuffer, barBuffer);
Flux<DataBuffer> output = this.encoder.encode(source, this.bufferFactory,
ResolvableType.forClassWithGenerics(Publisher.class, ByteBuffer.class),
null, Collections.emptyMap());
assertSame(source, output);
}
}