HttpConnectionParams


1   /*
2    * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//httpclient/src/java/org/apache/commons/httpclient/params/HttpConnectionParams.java,v 1.6 2004/09/15 20:32:21 olegk Exp $
3    * $Revision: 480424 $
4    * $Date: 2006-11-29 05:56:49 +0000 (Wed, 29 Nov 2006) $
5    *
6    * ====================================================================
7    *
8    *  Licensed to the Apache Software Foundation (ASF) under one or more
9    *  contributor license agreements.  See the NOTICE file distributed with
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11   *  The ASF licenses this file to You under the Apache License, Version 2.0
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20   *  See the License for the specific language governing permissions and
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23   *
24   * This software consists of voluntary contributions made by many
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30  
31  package org.apache.commons.httpclient.params;
32  
33  /**
34   * This class represents a collection of HTTP protocol parameters applicable to 
35   * {@link org.apache.commons.httpclient.HttpConnection HTTP connections}. 
36   * Protocol parameters may be linked together to form a hierarchy. If a particular 
37   * parameter value has not been explicitly defined in the collection itself, its 
38   * value will be drawn from the parent collection of parameters.
39   * 
40   * @author <a HREF="mailto:oleg@ural.ru">Oleg Kalnichevski</a>
41   * 
42   * @version $Revision: 480424 $
43   * 
44   * @since 3.0
45   */
46  public class HttpConnectionParams extends DefaultHttpParams {
47  
48      /**
49       * Defines the default socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds which is the 
50       * timeout for waiting for data. A timeout value of zero is interpreted as an infinite 
51       * timeout. This value is used when no socket timeout is set in the 
52       * {@link HttpMethodParams HTTP method parameters}. 
53       * <p>
54       * This parameter expects a value of type {@link Integer}.
55       * </p>
56       * @see java.net.SocketOptions#SO_TIMEOUT
57       */
58      public static final String   SO_TIMEOUT = "http.socket.timeout"; 
59  
60      /**
61       * Determines whether Nagle's algorithm is to be used. The Nagle's algorithm 
62       * tries to conserve bandwidth by minimizing the number of segments that are 
63       * sent. When applications wish to decrease network latency and increase 
64       * performance, they can disable Nagle's algorithm (that is enable TCP_NODELAY). 
65       * Data will be sent earlier, at the cost of an increase in bandwidth consumption. 
66       * <p>
67       * This parameter expects a value of type {@link Boolean}.
68       * </p>
69       * @see java.net.SocketOptions#TCP_NODELAY
70       */
71      public static final String   TCP_NODELAY = "http.tcp.nodelay"; 
72  
73      /**
74       * Determines a hint the size of the underlying buffers used by the platform 
75       * for outgoing network I/O. This value is a suggestion to the kernel from 
76       * the application about the size of buffers to use for the data to be sent 
77       * over the socket.
78       * <p>
79       * This parameter expects a value of type {@link Integer}.
80       * </p>
81       * @see java.net.SocketOptions#SO_SNDBUF
82       */
83      public static final String   SO_SNDBUF = "http.socket.sendbuffer"; 
84  
85      /**
86       * Determines a hint the size of the underlying buffers used by the platform 
87       * for incoming network I/O. This value is a suggestion to the kernel from 
88       * the application about the size of buffers to use for the data to be received 
89       * over the socket.  
90       * <p>
91       * This parameter expects a value of type {@link Integer}.
92       * </p>
93       * @see java.net.SocketOptions#SO_RCVBUF
94       */
95      public static final String   SO_RCVBUF = "http.socket.receivebuffer"; 
96  
97      /**
98       * Sets SO_LINGER with the specified linger time in seconds. The maximum timeout 
99       * value is platform specific. Value <tt>0</tt> implies that the option is disabled.
100      * Value <tt>-1</tt> implies that the JRE default is used. The setting only affects 
101      * socket close.  
102      * <p>
103      * This parameter expects a value of type {@link Integer}.
104      * </p>
105      * @see java.net.SocketOptions#SO_LINGER
106      */
107     public static final String   SO_LINGER = "http.socket.linger"; 
108 
109     /**
110      * Determines the timeout until a connection is etablished. A value of zero 
111      * means the timeout is not used. The default value is zero.
112      * <p>
113      * This parameter expects a value of type {@link Integer}.
114      * </p>
115      */
116     public static final String   CONNECTION_TIMEOUT = "http.connection.timeout"; 
117 
118     /**
119      * Determines whether stale connection check is to be used. Disabling 
120      * stale connection check may result in slight performance improvement 
121      * at the risk of getting an I/O error when executing a request over a
122      * connection that has been closed at the server side. 
123      * <p>
124      * This parameter expects a value of type {@link Boolean}.
125      * </p>
126      */
127     public static final String   STALE_CONNECTION_CHECK = "http.connection.stalecheck"; 
128 
129     /**
130      * Creates a new collection of parameters with the collection returned
131      * by {@link #getDefaultParams()} as a parent. The collection will defer
132      * to its parent for a default value if a particular parameter is not 
133      * explicitly set in the collection itself.
134      * 
135      * @see #getDefaultParams()
136      */
137     public HttpConnectionParams() {
138         super();
139     }
140 
141     /**
142      * Returns the default socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds which is the 
143      * timeout for waiting for data. A timeout value of zero is interpreted as an infinite 
144      * timeout. This value is used when no socket timeout is set in the 
145      * {@link HttpMethodParams HTTP method parameters}. 
146      *
147      * @return timeout in milliseconds
148      */
149     public int getSoTimeout() {
150         return getIntParameter(SO_TIMEOUT, 0);
151     }
152 
153     /**
154      * Sets the default socket timeout (<tt>SO_TIMEOUT</tt>) in milliseconds which is the 
155      * timeout for waiting for data. A timeout value of zero is interpreted as an infinite 
156      * timeout. This value is used when no socket timeout is set in the 
157      * {@link HttpMethodParams HTTP method parameters}. 
158      *
159      * @param timeout Timeout in milliseconds
160      */
161     public void setSoTimeout(int timeout) {
162         setIntParameter(SO_TIMEOUT, timeout);
163     }
164 
165     /**
166      * Determines whether Nagle's algorithm is to be used. The Nagle's algorithm 
167      * tries to conserve bandwidth by minimizing the number of segments that are 
168      * sent. When applications wish to decrease network latency and increase 
169      * performance, they can disable Nagle's algorithm (that is enable TCP_NODELAY). 
170      * Data will be sent earlier, at the cost of an increase in bandwidth consumption. 
171      *
172      * @param value <tt>true</tt> if the Nagle's algorithm is to NOT be used
173      *   (that is enable TCP_NODELAY), <tt>false</tt> otherwise.
174      */
175     public void setTcpNoDelay(boolean value) {
176         setBooleanParameter(TCP_NODELAY, value);
177     }
178 
179     /**
180      * Tests if Nagle's algorithm is to be used.  
181      *
182      * @return <tt>true</tt> if the Nagle's algorithm is to NOT be used
183      *   (that is enable TCP_NODELAY), <tt>false</tt> otherwise.
184      */
185     public boolean getTcpNoDelay() {
186         return getBooleanParameter(TCP_NODELAY, true);
187     }
188 
189     /**
190      * Returns a hint the size of the underlying buffers used by the platform for 
191      * outgoing network I/O. This value is a suggestion to the kernel from the 
192      * application about the size of buffers to use for the data to be sent over 
193      * the socket.
194      *
195      * @return the hint size of the send buffer
196      */
197     public int getSendBufferSize() {
198         return getIntParameter(SO_SNDBUF, -1);
199     }
200 
201     /**
202      * Sets a hint the size of the underlying buffers used by the platform for 
203      * outgoing network I/O. This value is a suggestion to the kernel from the 
204      * application about the size of buffers to use for the data to be sent over 
205      * the socket.
206      *
207      * @param size the hint size of the send buffer
208      */
209     public void setSendBufferSize(int size) {
210         setIntParameter(SO_SNDBUF, size);
211     }
212 
213     /**
214      * Returns a hint the size of the underlying buffers used by the platform 
215      * for incoming network I/O. This value is a suggestion to the kernel from 
216      * the application about the size of buffers to use for the data to be received 
217      * over the socket.  
218      *
219      * @return the hint size of the send buffer
220      */
221     public int getReceiveBufferSize() {
222         return getIntParameter(SO_RCVBUF, -1);
223     }
224 
225     /**
226      * Sets a hint the size of the underlying buffers used by the platform 
227      * for incoming network I/O. This value is a suggestion to the kernel from 
228      * the application about the size of buffers to use for the data to be received 
229      * over the socket.  
230      *
231      * @param size the hint size of the send buffer
232      */
233     public void setReceiveBufferSize(int size) {
234         setIntParameter(SO_RCVBUF, size);
235     }
236 
237     /**
238      * Returns linger-on-close timeout. Value <tt>0</tt> implies that the option is 
239      * disabled. Value <tt>-1</tt> implies that the JRE default is used.
240      * 
241      * @return the linger-on-close timeout
242      */
243     public int getLinger() {
244         return getIntParameter(SO_LINGER, -1);
245     }
246 
247     /**
248      * Returns linger-on-close timeout. This option disables/enables immediate return 
249      * from a close() of a TCP Socket. Enabling this option with a non-zero Integer 
250      * timeout means that a close() will block pending the transmission and 
251      * acknowledgement of all data written to the peer, at which point the socket is 
252      * closed gracefully. Value <tt>0</tt> implies that the option is 
253      * disabled. Value <tt>-1</tt> implies that the JRE default is used.
254      *
255      * @param value the linger-on-close timeout
256      */
257     public void setLinger(int value) {
258         setIntParameter(SO_LINGER, value);
259     }
260 
261     /**
262      * Returns the timeout until a connection is etablished. A value of zero 
263      * means the timeout is not used. The default value is zero.
264      * 
265      * @return timeout in milliseconds.
266      */
267     public int getConnectionTimeout() {
268         return getIntParameter(CONNECTION_TIMEOUT, 0);
269     }
270 
271     /**
272      * Sets the timeout until a connection is etablished. A value of zero 
273      * means the timeout is not used. The default value is zero.
274      * 
275      * @param timeout Timeout in milliseconds.
276      */
277     public void setConnectionTimeout(int timeout) {
278         setIntParameter(CONNECTION_TIMEOUT, timeout);
279     }
280     
281     /**
282      * Tests whether stale connection check is to be used. Disabling 
283      * stale connection check may result in slight performance improvement 
284      * at the risk of getting an I/O error when executing a request over a
285      * connection that has been closed at the server side. 
286      * 
287      * @return <tt>true</tt> if stale connection check is to be used, 
288      *   <tt>false</tt> otherwise.
289      */
290     public boolean isStaleCheckingEnabled() {
291         return getBooleanParameter(STALE_CONNECTION_CHECK, true);
292     }
293 
294     /**
295      * Defines whether stale connection check is to be used. Disabling 
296      * stale connection check may result in slight performance improvement 
297      * at the risk of getting an I/O error when executing a request over a
298      * connection that has been closed at the server side. 
299      * 
300      * @param value <tt>true</tt> if stale connection check is to be used, 
301      *   <tt>false</tt> otherwise.
302      */
303     public void setStaleCheckingEnabled(boolean value) {
304         setBooleanParameter(STALE_CONNECTION_CHECK, value);
305     }
306 }
307
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