[1374] | 1 | // Copyright 2012 Georg-August-Universität Göttingen, Germany |
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| 2 | // |
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| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
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| 4 | // you may not use this file except in compliance with the License. |
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| 5 | // You may obtain a copy of the License at |
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| 6 | // |
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| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
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| 8 | // |
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| 9 | // Unless required by applicable law or agreed to in writing, software |
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| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
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| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 12 | // See the License for the specific language governing permissions and |
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| 13 | // limitations under the License. |
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| 14 | |
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| 15 | package de.ugoe.cs.autoquest.httpmonitor.proxy; |
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| 16 | |
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| 17 | import java.io.IOException; |
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| 18 | import java.net.URI; |
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| 19 | import java.net.URISyntaxException; |
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| 20 | import java.nio.ByteBuffer; |
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| 21 | import java.util.Iterator; |
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| 22 | |
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| 23 | import javax.servlet.http.HttpServletRequest; |
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| 24 | import javax.servlet.http.HttpServletResponse; |
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| 25 | |
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| 26 | import org.eclipse.jetty.client.api.ContentProvider; |
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| 27 | import org.eclipse.jetty.client.api.Request; |
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| 28 | import org.eclipse.jetty.client.api.Response; |
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| 29 | import org.eclipse.jetty.proxy.ProxyServlet; |
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| 30 | |
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| 31 | import de.ugoe.cs.autoquest.httpmonitor.exchange.Status; |
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| 32 | import de.ugoe.cs.util.console.Console; |
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| 33 | |
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| 34 | /** |
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| 35 | * <p> |
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| 36 | * TODO document |
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| 37 | * the servlet deployed in the web server that receives all client messages and returns the client |
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| 38 | * java script. The messages are parsed, validated, and forwarded to the provided message listener. |
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| 39 | * If a message is not valid, it is discarded. If an event in a message is not valid, it is |
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| 40 | * discarded. Messages are only received via the POST HTTP method. The GET HTTP method is only |
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| 41 | * implemented for returning the client java script. |
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| 42 | * </p> |
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| 43 | * |
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| 44 | * @author Patrick Harms |
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| 45 | */ |
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| 46 | class HttpMonitoringProxyServlet extends ProxyServlet { |
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| 47 | |
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| 48 | /** */ |
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| 49 | private static final long serialVersionUID = 1L; |
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| 50 | |
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| 51 | /** */ |
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| 52 | private String proxiedServer; |
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| 53 | |
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| 54 | /** */ |
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| 55 | private int proxiedPort; |
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| 56 | |
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| 57 | /** */ |
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| 58 | private ExchangeListenerManager exchangeListenerManager; |
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| 59 | |
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| 60 | /** |
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| 61 | * <p> |
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| 62 | * initializes the servlet with the message listener to which all events shall be forwarded |
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| 63 | * </p> |
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| 64 | * |
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| 65 | * @param messageListener the message listener that shall receive all client events |
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| 66 | */ |
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| 67 | HttpMonitoringProxyServlet(String proxiedServer, |
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| 68 | int proxiedPort, |
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| 69 | ExchangeListenerManager exchangeListenerManager) |
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| 70 | { |
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| 71 | this.proxiedServer = proxiedServer; |
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| 72 | this.proxiedPort = proxiedPort; |
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| 73 | this.exchangeListenerManager = exchangeListenerManager; |
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| 74 | } |
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| 75 | |
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| 76 | /* (non-Javadoc) |
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| 77 | * @see org.eclipse.jetty.proxy.ProxyServlet#rewriteURI(javax.servlet.http.HttpServletRequest) |
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| 78 | */ |
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| 79 | @Override |
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| 80 | protected URI rewriteURI(HttpServletRequest request) { |
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| 81 | try { |
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| 82 | return new URI(request.getScheme(), null, proxiedServer, proxiedPort, |
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| 83 | request.getPathTranslated(), request.getQueryString(), null); |
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| 84 | } |
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| 85 | catch (URISyntaxException e) { |
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| 86 | Console.printerrln("could not rewrite URI: " + e); |
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| 87 | Console.logException(e); |
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| 88 | return null; |
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| 89 | } |
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| 90 | } |
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| 91 | |
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| 92 | /* (non-Javadoc) |
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| 93 | * @see org.eclipse.jetty.proxy.ProxyServlet#customizeProxyRequest(org.eclipse.jetty.client.api.Request, javax.servlet.http.HttpServletRequest) |
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| 94 | */ |
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| 95 | @Override |
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| 96 | protected void customizeProxyRequest(Request proxyRequest, HttpServletRequest request) { |
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| 97 | super.customizeProxyRequest(proxyRequest, request); |
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| 98 | |
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| 99 | exchangeListenerManager.onRequest(request); |
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| 100 | proxyRequest.content(new DubbingContentProvider(request, proxyRequest.getContent())); |
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| 101 | } |
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| 102 | |
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| 103 | /* (non-Javadoc) |
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| 104 | * @see org.eclipse.jetty.proxy.ProxyServlet#onResponseContent(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.eclipse.jetty.client.api.Response, byte[], int, int) |
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| 105 | */ |
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| 106 | @Override |
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| 107 | protected void onResponseContent(HttpServletRequest request, |
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| 108 | HttpServletResponse response, |
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| 109 | Response proxyResponse, |
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| 110 | byte[] buffer, |
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| 111 | int offset, |
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| 112 | int length) |
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| 113 | throws IOException |
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| 114 | { |
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| 115 | super.onResponseContent(request, response, proxyResponse, buffer, offset, length); |
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| 116 | |
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| 117 | exchangeListenerManager.onResponseContent(request, ByteBuffer.wrap(buffer, offset, length)); |
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| 118 | } |
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| 119 | |
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| 120 | /* (non-Javadoc) |
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| 121 | * @see org.eclipse.jetty.proxy.ProxyServlet#onResponseSuccess(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.eclipse.jetty.client.api.Response) |
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| 122 | */ |
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| 123 | @Override |
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| 124 | protected void onResponseSuccess(HttpServletRequest request, |
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| 125 | HttpServletResponse response, |
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| 126 | Response proxyResponse) |
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| 127 | { |
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| 128 | exchangeListenerManager.onResponse(request, response); |
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| 129 | exchangeListenerManager.onFinish(request, Status.SUCCESS); |
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| 130 | |
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| 131 | super.onResponseSuccess(request, response, proxyResponse); |
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| 132 | } |
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| 133 | |
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| 134 | /* (non-Javadoc) |
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| 135 | * @see org.eclipse.jetty.proxy.ProxyServlet#onResponseFailure(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, org.eclipse.jetty.client.api.Response, java.lang.Throwable) |
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| 136 | */ |
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| 137 | @Override |
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| 138 | protected void onResponseFailure(HttpServletRequest request, |
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| 139 | HttpServletResponse response, |
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| 140 | Response proxyResponse, |
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| 141 | Throwable failure) |
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| 142 | { |
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| 143 | exchangeListenerManager.onResponse(request, response); |
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| 144 | exchangeListenerManager.onFinish(request, Status.FAILURE); |
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| 145 | |
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| 146 | super.onResponseFailure(request, response, proxyResponse, failure); |
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| 147 | } |
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| 148 | |
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| 149 | /** |
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| 150 | * |
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| 151 | */ |
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| 152 | private class DubbingContentProvider implements ContentProvider { |
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| 153 | |
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| 154 | /** */ |
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| 155 | private HttpServletRequest request; |
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| 156 | |
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| 157 | /** */ |
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| 158 | private ContentProvider delegate; |
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| 159 | |
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| 160 | /** |
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| 161 | * |
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| 162 | */ |
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| 163 | public DubbingContentProvider(HttpServletRequest request, ContentProvider delegate) { |
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| 164 | this.request = request; |
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| 165 | this.delegate = delegate; |
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| 166 | } |
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| 167 | |
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| 168 | /* (non-Javadoc) |
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| 169 | * @see java.lang.Iterable#iterator() |
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| 170 | */ |
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| 171 | @Override |
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| 172 | public Iterator<ByteBuffer> iterator() { |
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| 173 | return new DubbingByteBufferIterator(request, delegate.iterator()); |
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| 174 | } |
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| 175 | |
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| 176 | /* (non-Javadoc) |
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| 177 | * @see org.eclipse.jetty.client.api.ContentProvider#getLength() |
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| 178 | */ |
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| 179 | @Override |
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| 180 | public long getLength() { |
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| 181 | return delegate.getLength(); |
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| 182 | } |
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| 183 | |
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| 184 | } |
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| 185 | |
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| 186 | /** |
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| 187 | * |
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| 188 | */ |
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| 189 | public class DubbingByteBufferIterator implements Iterator<ByteBuffer> { |
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| 190 | |
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| 191 | /** */ |
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| 192 | private HttpServletRequest request; |
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| 193 | |
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| 194 | /** */ |
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| 195 | private Iterator<ByteBuffer> delegate; |
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| 196 | |
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| 197 | /** |
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| 198 | * |
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| 199 | */ |
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| 200 | public DubbingByteBufferIterator(HttpServletRequest request, Iterator<ByteBuffer> delegate) { |
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| 201 | this.request = request; |
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| 202 | this.delegate = delegate; |
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| 203 | } |
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| 204 | |
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| 205 | /* (non-Javadoc) |
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| 206 | * @see java.util.Iterator#hasNext() |
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| 207 | */ |
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| 208 | @Override |
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| 209 | public boolean hasNext() { |
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| 210 | return delegate.hasNext(); |
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| 211 | } |
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| 212 | |
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| 213 | /* (non-Javadoc) |
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| 214 | * @see java.util.Iterator#next() |
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| 215 | */ |
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| 216 | @Override |
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| 217 | public ByteBuffer next() { |
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| 218 | ByteBuffer next = delegate.next(); |
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| 219 | exchangeListenerManager.onRequestContent(request, next.duplicate()); |
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| 220 | return next; |
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| 221 | } |
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| 222 | |
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| 223 | /* (non-Javadoc) |
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| 224 | * @see java.util.Iterator#remove() |
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| 225 | */ |
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| 226 | @Override |
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| 227 | public void remove() { |
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| 228 | delegate.remove(); |
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| 229 | } |
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| 230 | |
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| 231 | } |
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| 232 | |
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| 233 | } |
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