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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<link rel="stylesheet" type="text/css" href="../stylesheets/style.css">
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<title>WaitFor Task</title>
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</head>
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<body>
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<h2>Waitfor</h2>
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<h3>Description</h3>
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<p>Blocks execution until a set of specified conditions become true. This is intended to be used
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with the <a href="parallel.html">parallel</a> task to synchronize a set of processes.</p>
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<p>The conditions to wait for are defined in <a href="waitfor.html#nested">nested elements</a>, if
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multiple conditions are specified, then the task will wait until all conditions are true.</p>
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<p>If both <var>maxwait</var> and <var>maxwaitunit</var> are not specified,
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default <var>maxwait</var> is 3 minutes (180000 milliseconds).</p>
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<p>If the <var>timeoutproperty</var> attribute has been set, a property of that name will be created
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if the condition didn't come true within the specified time.</p>
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<h3>Parameters</h3>
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<table class="attr">
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<tr>
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<th scope="col">Attribute</th>
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<th scope="col">Description</th>
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<th scope="col">Required</th>
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</tr>
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<tr>
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<td>maxwait</td>
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<td>The maximum amount of time to wait for all the required conditions to become true before
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failing the task.</td>
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<td>No; defaults to 180000 <var>maxwaitunit</var>s</td>
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</tr>
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<tr>
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<td>maxwaitunit</td>
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<td>The unit of time that must be used to interpret the value of the <var>maxwait</var>
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attribute. Valid values are
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<ul>
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<li><q>millisecond</q></li>
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<li><q>second</q></li>
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<li><q>minute</q></li>
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<li><q>hour</q></li>
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<li><q>day</q></li>
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<li><q>week</q></li>
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</ul>
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</td>
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<td>No; defaults to <q>millisecond</q></td>
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</tr>
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<tr>
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<td>checkevery</td>
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<td>The amount of time to wait between each test of the conditions.</td>
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<td>No; defaults to 500 <var>checkeveryunit</var>s</td>
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</tr>
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<tr>
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<td>checkeveryunit</td>
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<td>The unit of time that must be used to interpret the value of the <var>checkevery</var>
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attribute. Valid values are
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<ul>
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<li><q>millisecond</q></li>
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<li><q>second</q></li>
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<li><q>minute</q></li>
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<li><q>hour</q></li>
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<li><q>day</q></li>
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<li><q>week</q></li>
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</ul>
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</td>
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<td>No; defaults to <q>millisecond</q></td>
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</tr>
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<tr>
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<td>timeoutproperty</td>
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<td>the name of the property to set if <var>maxwait</var> has been exceeded.</td>
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<td>No</td>
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</tr>
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</table>
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<h3 id="nested">Parameters specified as nested elements</h3>
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<p>The available conditions that satisfy the <code><waitfor></code> task are the same as those
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for the <a href="condition.html"><code><condition></code></a>
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task. See <a href="conditions.html">here</a> for the full list.</p>
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<h3>Examples</h3>
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<p>Wait up to 30 seconds for a file called <samp>errors.log</samp> to appear.</p>
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<pre>
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<waitfor maxwait="30" maxwaitunit="second">
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<available file="errors.log"/>
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</waitfor></pre>
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<p>Wait up to 3 minutes (and checks every 500 milliseconds) for a web server
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on <samp>localhost</samp> to serve up the specified URL.</p>
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<pre>
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<waitfor maxwait="3" maxwaitunit="minute" checkevery="500">
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<http url="http://localhost/myapp/index.html"/>
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</waitfor></pre>
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<p>Wait up to 10 seconds for a server on the <samp>dbserver</samp> machine to begin listening on
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port 1521 and for the <samp>http://webserver/mypage.html</samp> web page to become available.</p>
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<pre>
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<waitfor maxwait="10" maxwaitunit="second">
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<and>
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<socket server="dbserver" port="1521"/>
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<http url="http://webserver/mypage.html"/>
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</and>
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</waitfor></pre>
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</body>
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</html>
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