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Eliminates unnecessary overhead (#1786)
* Refactor AsyncResponseHandler * Extract ResponseHandler from AsyncResponseHandler * Use ResponseHandler on SynchronousMethodHandler Eliminates unnecessary overhead caused by CompletableFutre on synchronous operation. * Modify `AsyncResponseHandler.handleResponse` method signature * Fix code format Co-authored-by: Marvin Froeder <velo@users.noreply.github.com> Co-authored-by: Marvin Froeder <marvin.froeder@dovetailstudios.com>
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/* | ||
* Copyright 2012-2022 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; | ||
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import feign.Logger.Level; | ||
import feign.codec.Decoder; | ||
import feign.codec.ErrorDecoder; | ||
import java.io.IOException; | ||
import java.lang.reflect.Type; | ||
import static feign.FeignException.errorReading; | ||
import static feign.Util.ensureClosed; | ||
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/** | ||
* The response handler that is used to provide synchronous support on top of standard response | ||
* handling | ||
*/ | ||
public class ResponseHandler { | ||
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private static final long MAX_RESPONSE_BUFFER_SIZE = 8192L; | ||
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private final Level logLevel; | ||
private final Logger logger; | ||
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private final Decoder decoder; | ||
private final ErrorDecoder errorDecoder; | ||
private final boolean dismiss404; | ||
private final boolean closeAfterDecode; | ||
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private final ResponseInterceptor responseInterceptor; | ||
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public ResponseHandler(Level logLevel, Logger logger, Decoder decoder, | ||
ErrorDecoder errorDecoder, boolean dismiss404, boolean closeAfterDecode, | ||
ResponseInterceptor responseInterceptor) { | ||
super(); | ||
this.logLevel = logLevel; | ||
this.logger = logger; | ||
this.decoder = decoder; | ||
this.errorDecoder = errorDecoder; | ||
this.dismiss404 = dismiss404; | ||
this.closeAfterDecode = closeAfterDecode; | ||
this.responseInterceptor = responseInterceptor; | ||
} | ||
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public Object handleResponse(String configKey, | ||
Response response, | ||
Type returnType, | ||
long elapsedTime) | ||
throws Exception { | ||
try { | ||
response = logAndRebufferResponseIfNeeded(configKey, response, elapsedTime); | ||
if (returnType == Response.class) { | ||
return disconnectResponseBodyIfNeeded(response); | ||
} | ||
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final boolean shouldDecodeResponseBody = (response.status() >= 200 && response.status() < 300) | ||
|| (response.status() == 404 && dismiss404 && !isVoidType(returnType)); | ||
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if (!shouldDecodeResponseBody) { | ||
throw decodeError(configKey, response); | ||
} | ||
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return decode(response, returnType); | ||
} catch (final IOException e) { | ||
if (logLevel != Level.NONE) { | ||
logger.logIOException(configKey, logLevel, e, elapsedTime); | ||
} | ||
throw errorReading(response.request(), response, e); | ||
} | ||
} | ||
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private boolean isVoidType(Type returnType) { | ||
return returnType == Void.class | ||
|| returnType == void.class | ||
|| returnType.getTypeName().equals("kotlin.Unit"); | ||
} | ||
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private Response logAndRebufferResponseIfNeeded(String configKey, | ||
Response response, | ||
long elapsedTime) | ||
throws IOException { | ||
if (logLevel == Level.NONE) { | ||
return response; | ||
} | ||
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return logger.logAndRebufferResponse(configKey, logLevel, response, elapsedTime); | ||
} | ||
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private static Response disconnectResponseBodyIfNeeded(Response response) throws IOException { | ||
final boolean shouldDisconnectResponseBody = response.body() != null | ||
&& response.body().length() != null | ||
&& response.body().length() <= MAX_RESPONSE_BUFFER_SIZE; | ||
if (!shouldDisconnectResponseBody) { | ||
return response; | ||
} | ||
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try { | ||
final byte[] bodyData = Util.toByteArray(response.body().asInputStream()); | ||
return response.toBuilder().body(bodyData).build(); | ||
} finally { | ||
ensureClosed(response.body()); | ||
} | ||
} | ||
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private Object decode(Response response, Type type) throws IOException { | ||
if (isVoidType(type)) { | ||
ensureClosed(response.body()); | ||
return null; | ||
} | ||
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try { | ||
final Object result = responseInterceptor.aroundDecode( | ||
new InvocationContext(decoder, type, response)); | ||
if (closeAfterDecode) { | ||
ensureClosed(response.body()); | ||
} | ||
return result; | ||
} catch (Exception e) { | ||
ensureClosed(response.body()); | ||
throw e; | ||
} | ||
} | ||
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private Exception decodeError(String methodKey, Response response) { | ||
try { | ||
return errorDecoder.decode(methodKey, response); | ||
} finally { | ||
ensureClosed(response.body()); | ||
} | ||
} | ||
} |
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