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1 /* |
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2 * ==================================================================== |
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3 * Licensed to the Apache Software Foundation (ASF) under one |
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4 * or more contributor license agreements. See the NOTICE file |
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5 * distributed with this work for additional information |
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6 * regarding copyright ownership. The ASF licenses this file |
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7 * to you under the Apache License, Version 2.0 (the |
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8 * "License"); you may not use this file except in compliance |
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9 * with the License. You may obtain a copy of the License at |
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10 * |
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11 * http://www.apache.org/licenses/LICENSE-2.0 |
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12 * |
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13 * Unless required by applicable law or agreed to in writing, |
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14 * software distributed under the License is distributed on an |
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15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
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16 * KIND, either express or implied. See the License for the |
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17 * specific language governing permissions and limitations |
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18 * under the License. |
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19 * ==================================================================== |
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20 * |
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21 * This software consists of voluntary contributions made by many |
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22 * individuals on behalf of the Apache Software Foundation. For more |
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23 * information on the Apache Software Foundation, please see |
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24 * <http://www.apache.org/>. |
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25 * |
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26 */ |
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27 package ch.boye.httpclientandroidlib.impl.client; |
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28 |
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29 import ch.boye.httpclientandroidlib.annotation.Immutable; |
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30 |
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31 import ch.boye.httpclientandroidlib.HeaderElement; |
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32 import ch.boye.httpclientandroidlib.HeaderElementIterator; |
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33 import ch.boye.httpclientandroidlib.HttpResponse; |
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34 import ch.boye.httpclientandroidlib.conn.ConnectionKeepAliveStrategy; |
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35 import ch.boye.httpclientandroidlib.message.BasicHeaderElementIterator; |
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36 import ch.boye.httpclientandroidlib.protocol.HTTP; |
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37 import ch.boye.httpclientandroidlib.protocol.HttpContext; |
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38 |
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39 /** |
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40 * Default implementation of a strategy deciding duration |
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41 * that a connection can remain idle. |
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42 * |
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43 * The default implementation looks solely at the 'Keep-Alive' |
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44 * header's timeout token. |
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45 * |
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46 * @since 4.0 |
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47 */ |
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48 @Immutable |
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49 public class DefaultConnectionKeepAliveStrategy implements ConnectionKeepAliveStrategy { |
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50 |
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51 public long getKeepAliveDuration(HttpResponse response, HttpContext context) { |
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52 if (response == null) { |
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53 throw new IllegalArgumentException("HTTP response may not be null"); |
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54 } |
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55 HeaderElementIterator it = new BasicHeaderElementIterator( |
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56 response.headerIterator(HTTP.CONN_KEEP_ALIVE)); |
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57 while (it.hasNext()) { |
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58 HeaderElement he = it.nextElement(); |
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59 String param = he.getName(); |
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60 String value = he.getValue(); |
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61 if (value != null && param.equalsIgnoreCase("timeout")) { |
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62 try { |
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63 return Long.parseLong(value) * 1000; |
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64 } catch(NumberFormatException ignore) { |
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65 } |
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66 } |
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67 } |
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68 return -1; |
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69 } |
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70 |
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71 } |