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| <meta http-equiv="Content-Language" content="en-us"> |
| <title>WaitFor Task</title> |
| <link rel="stylesheet" type="text/css" href="../stylesheets/antmanual.css"> |
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| <body> |
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| <h2>Waitfor</h2> |
| <h3>Description</h3> |
| <p>Blocks execution until a set of specified conditions become true. This is intended |
| to be used with the <a href="parallel.html">parallel</a> task to |
| synchronize a set of processes.</p> |
| <p>The conditions to wait for are defined in <a href="waitfor.html#nested">nested elements</a>, |
| if multiple conditions are specified, then the task will wait until all conditions are true..</p> |
| <p></p> |
| <p>If both maxwait and maxwaitunit are not specified, the maxwait is 3 minutes (180000 milliseconds).</p> |
| <p>If the <code>timeoutproperty</code> attribute has been set, a |
| property of that name will be created if the condition didn't come |
| true within the specified time.</p> |
| <h3>Parameters</h3> |
| <table border="1" cellpadding="2" cellspacing="0"> |
| <tr> |
| <td valign="top"><b>Attribute</b></td> |
| <td valign="top"><b>Description</b></td> |
| <td align="center" valign="top"><b>Required</b></td> |
| </tr> |
| <tr> |
| <td valign="top">maxwait</td> |
| <td valign="top">The maximum amount of time to wait for all the required conditions |
| to become true before failing the task. Defaults to 180000 maxwaitunits.</td> |
| <td valign="top" align="center">No</td> |
| </tr> |
| <tr> |
| <td valign="top">maxwaitunit</td> |
| <td valign="top">The unit of time that must be used to interpret the value of the |
| maxwait attribute. Defaults to millisecond. |
| Valid Values are |
| <ul> |
| <li>millisecond</li> |
| <li>second</li> |
| <li>minute</li> |
| <li>hour</li> |
| <li>day</li> |
| <li>week</li> |
| </ul> |
| </td> |
| <td valign="top" align="center">No</td> |
| </tr> |
| <tr> |
| <td valign="top">checkevery</td> |
| <td valign="top">The amount of time to wait between each test of the conditions. |
| Defaults to 500 checkeveryunits.</td> |
| <td valign="top" align="center">No</td> |
| </tr> |
| <tr> |
| <td valign="top">checkeveryunit</td> |
| <td valign="top">The unit of time that must be used to interpret the value of the |
| checkevery attribute. Defaults to millisecond. |
| Valid Values are |
| <ul> |
| <li>millisecond</li> |
| <li>second</li> |
| <li>minute</li> |
| <li>hour</li> |
| <li>day</li> |
| <li>week</li> |
| </ul> |
| </td> |
| <td valign="top" align="center">No</td> |
| </tr> |
| <tr> |
| <td valign="top">timeoutproperty</td> |
| <td valign="top">the name of the property to set if maxwait has |
| been exceeded.</td> |
| <td valign="top" align="center">No</td> |
| </tr> |
| </table> |
| <h3><a name="nested">Nested Elements</a></h3> |
| |
| <p>The available conditions that satisfy the |
| <code><waitfor></code> task are the same as those for the |
| <a href="condition.html"><code><condition></code></a> task. See |
| <a href="conditions.html">here</a> for the full list.</p> |
| |
| <h3>Examples</h3> |
| <blockquote> |
| <p><code><waitfor maxwait="30" maxwaitunit="second"><br> |
| <available file="errors.log"/><br> |
| </waitfor></code></p> |
| </blockquote> |
| <p>waits up to 30 seconds for a file called errors.log to appear.</p> |
| <blockquote> |
| <p><code><waitfor maxwait="3" maxwaitunit="minute" checkevery="500"><br> |
| <http url="http://localhost/myapp/index.html"/><br> |
| </waitfor></code></p> |
| </blockquote> |
| <p>waits up to 3 minutes (and checks every 500 milliseconds) for a web server on localhost |
| to serve up the specified URL.</p> |
| <blockquote> |
| <p><code><waitfor maxwait="10" maxwait="second"><br> |
| <and><br> |
| <socket server="dbserver" port="1521"/><br> |
| <http url="http://webserver/mypage.html"/><br> |
| </and><br> |
| </waitfor></code></p> |
| </blockquote> |
| <p>waits up to 10 seconds for a server on the dbserver machine to begin listening |
| on port 1521 and for the http://webserver/mypage.html web page |
| to become available.</p> |
| <hr><p align="center">Copyright © 2001 Apache Software Foundation. All rights |
| Reserved.</p> |
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