org.springframework.http.server.reactive.TomcatHttpHandlerAdapter Maven / Gradle / Ivy
/*
* 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.server.reactive;
import java.io.IOException;
import java.nio.ByteBuffer;
import javax.servlet.AsyncContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.catalina.connector.CoyoteInputStream;
import org.apache.catalina.connector.CoyoteOutputStream;
import org.springframework.core.io.buffer.DataBuffer;
import org.springframework.core.io.buffer.DataBufferFactory;
import org.springframework.core.io.buffer.DataBufferUtils;
import org.springframework.util.Assert;
/**
* {@link ServletHttpHandlerAdapter} extension that uses Tomcat APIs for reading
* from the request and writing to the response with {@link ByteBuffer}.
*
* @author Violeta Georgieva
* @since 5.0
*/
@WebServlet(asyncSupported = true)
public class TomcatHttpHandlerAdapter extends ServletHttpHandlerAdapter {
public TomcatHttpHandlerAdapter(HttpHandler httpHandler) {
super(httpHandler);
}
@Override
protected ServerHttpRequest createRequest(HttpServletRequest request, AsyncContext asyncContext)
throws IOException {
Assert.notNull(getServletPath(), "servletPath is not initialized.");
return new TomcatServerHttpRequest(request, asyncContext, getServletPath(),
getDataBufferFactory(), getBufferSize());
}
@Override
protected ServerHttpResponse createResponse(HttpServletResponse response, AsyncContext cxt)
throws IOException {
return new TomcatServerHttpResponse(response, cxt, getDataBufferFactory(), getBufferSize());
}
private final class TomcatServerHttpRequest extends ServletServerHttpRequest {
public TomcatServerHttpRequest(HttpServletRequest request, AsyncContext context,
String servletPath, DataBufferFactory factory, int bufferSize) throws IOException {
super(request, context, servletPath, factory, bufferSize);
}
@Override
protected DataBuffer readFromInputStream() throws IOException {
boolean release = true;
int capacity = getBufferSize();
DataBuffer dataBuffer = getDataBufferFactory().allocateBuffer(capacity);
try {
ByteBuffer byteBuffer = dataBuffer.asByteBuffer(0, capacity);
ServletRequest request = getNativeRequest();
int read = ((CoyoteInputStream) request.getInputStream()).read(byteBuffer);
if (logger.isTraceEnabled()) {
logger.trace("read:" + read);
}
if (read > 0) {
dataBuffer.writePosition(read);
release = false;
return dataBuffer;
}
else {
return null;
}
}
finally {
if (release) {
DataBufferUtils.release(dataBuffer);
}
}
}
}
private static final class TomcatServerHttpResponse extends ServletServerHttpResponse {
public TomcatServerHttpResponse(HttpServletResponse response, AsyncContext context,
DataBufferFactory factory, int bufferSize) throws IOException {
super(response, context, factory, bufferSize);
}
@Override
protected int writeToOutputStream(DataBuffer dataBuffer) throws IOException {
ByteBuffer input = dataBuffer.asByteBuffer();
int len = input.remaining();
ServletResponse response = getNativeResponse();
((CoyoteOutputStream) response.getOutputStream()).write(input);
return len;
}
}
}