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<ul id="add-menu-link-page" class="section-page first">
<li>
<a id="add-comment-menu-link" href="Delay+Export-showComments=true&showCommentArea=true.htm#addcomment" tppabs="http://10.20.160.198/wiki/display/dubbo/Delay+Export?showComments=true&showCommentArea=true#addcomment" class="add-comment" title="Add a Comment">
<span>Comment</span></a> </li>
</ul>
</div>
</li>
<li class="normal ajs-menu-item">
<a id="action-menu-link" class="action trigger ajs-menu-title" href="#"><span><span>Tools</span></span></a> <div class="assistive ajs-drop-down">
<ul id="action-menu-link-primary" class="section-primary first">
<li>
<a id="view-attachments-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/viewpageattachments.action?pageId=6950732 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/viewpageattachments.action?pageId=6950732%27" tppabs="http://10.20.160.198/wiki/pages/viewpageattachments.action?pageId=6950732" class="action-view-attachments" accessKey="a" title="View Attachments">
<span><u>A</u>ttachments (2)</span></a> </li>
<li>
<a id="action-view-history-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/viewpreviousversions.action?pageId=6950732 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/viewpreviousversions.action?pageId=6950732%27" tppabs="http://10.20.160.198/wiki/pages/viewpreviousversions.action?pageId=6950732" class="action-view-history" title="">
<span>Page History</span></a> </li>
<li>
<a id="action-page-permissions-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732%27" tppabs="http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732" class="action-page-permissions" title="Edit restrictions">
<span>Restrictions</span></a> </li>
</ul>
<ul id="action-menu-link-secondary" class="section-secondary">
<li>
<a id="view-page-info-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732%27" tppabs="http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732" class="action-view-info" title="">
<span>Info</span></a> </li>
<li>
<a id="link-to-page-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732%27" tppabs="http://10.20.160.198/wiki/pages/viewinfo.action?pageId=6950732" class="" title="Link to this Page">
<span>Link to this Page&hellip;</span></a> </li>
<li>
<a id="view-in-hierarchy-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/listpages-dirview.action?key=dubbo&openId=6950732 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/listpages-dirview.action?key=dubbo&openId=6950732#selectedPageInHierarchy%27" tppabs="http://10.20.160.198/wiki/pages/listpages-dirview.action?key=dubbo&openId=6950732#selectedPageInHierarchy" class="" title="">
<span>View in Hierarchy</span></a> </li>
<li>
<a id="action-view-source-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/viewpagesrc.action?pageId=6950732 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/viewpagesrc.action?pageId=6950732%27" tppabs="http://10.20.160.198/wiki/pages/viewpagesrc.action?pageId=6950732" class="action-view-source popup-link" title="">
<span>View Wiki Markup</span></a> </li>
</ul>
</div>
</li>
</ul>
</div>
<h1 id="title-heading" class="pagetitle" style="display: none">
<a href="javascript:if(confirm(%27http://10.20.160.198/wiki/display/dubbo \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/display/dubbo%27" tppabs="http://10.20.160.198/wiki/display/dubbo"><img class="logo space custom" src="dubbo-version=5&modificationDate=1320723683000.jpg" tppabs="http://10.20.160.198/wiki/download/attachments/6324241/dubbo?version=5&modificationDate=1320723683000" alt=""></a>
</h1>
<div id="content" class="page view">
<div id="link-to-page-fields" class="hidden parameters">
<input type="hidden" id="linkToThisPageHeading" value="Link to this Page">
<input type="hidden" id="linkToThisPageLink" value="Link">
<input type="hidden" id="linkToThisPageTinyLink" value="Tiny Link">
<input type="hidden" id="linkToThisPageWikiMarkup" value="Wiki Markup">
<input type="hidden" id="linkToThisPageClose" value="Close">
</div>
<fieldset class="hidden parameters">
<input type="hidden" title="movePageDialogViewPageTitle" value="Move Page &ndash; &#8216;Delay Export&#8217;">
<input type="hidden" title="movePageDialogEditPageTitle" value="Set Page Location">
<input type="hidden" title="movePageDialogMoveButton" value="Move">
<input type="hidden" title="movePageDialogCancelButton" value="Cancel">
<input type="hidden" title="movePageDialogBrowsePanelTip" value="Click to select the new parent page for this page and its children.">
<input type="hidden" title="movePageDialogSearchPanel" value="Search">
<input type="hidden" title="movePageDialogHistoryPanel" value="Recently Viewed">
<input type="hidden" title="movePageDialogHistoryNoResults" value="There were no recently viewed pages found.">
<input type="hidden" title="movePageDialogLocationPanel" value="Known Location">
<input type="hidden" title="movePageDialogLocationNotFound" value="The specified page was not found.">
<input type="hidden" title="movePageDialogBrowsePanel" value="Browse">
<input type="hidden" title="movePageDialogPanelLoadErrorMsg" value="Error reading the panel content from the server.">
<input type="hidden" title="movePageDialogPanelLoadErrorTip" value="You could try reloading the page and launching the dialog again.">
<input type="hidden" title="movePageDialogPanelLoadErrorStatus" value="HTTP Status">
<input type="hidden" title="movePageDialogNoSelectionErrorMsg" value="You must make a selection in the tree before you can move the page.">
<input type="hidden" title="movePageDialogSearchError" value="Failed to retrieve search results from the server.">
<input type="hidden" title="movePageDialogSearchNoResults" value="There were no pages found containing <b>{0}</b>.">
<input type="hidden" title="movePageDialogSearchResultCount" value="Showing <b>{0}</b>-<b>{1}</b> of <b>{2}</b> pages containing <b>{3}</b>.">
<input type="hidden" title="movePageDialogMoveFailed" value="Move failed. There was a problem contacting the server.">
<input type="hidden" title="movePageDialogCannotChangeSpace" value="You cannot move this page to another space because you do not have permission to remove it from this space.">
<input type="hidden" title="pageTitle" value="Delay Export"/>
<input type="hidden" title="parentPageTitle" value="Examples"/>
<input type="hidden" title="fromPageTitle" value=""/>
<input type="hidden" title="spaceKey" value="dubbo"/>
<input type="hidden" title="spaceName" value="Dubbo"/>
<input type="hidden" title="movePageDialogInvalidLocation" value="You cannot move a page to be underneath itself or its children."/>
<input type="hidden" title="movePageDialogOrderingTitle" value="Page Ordering"/>
<input type="hidden" title="movePageDialogBackButton" value="Back"/>
<input type="hidden" title="movePageDialogMoveAndOrderButton" value="Reorder"/>
<input type="hidden" title="movePageDialogNextButton" value="Move"/>
</fieldset>
<script type="text/x-template" title="movePageDialog">
<div class="row information">
<div class="inner">
<div class="element">
Specify the new parent page for this page and its children by space and title.
</div>
</div>
</div>
<div class="form">
<fieldset>
<legend class="assistive"><span>Change the Parent Page to a Known Page</span></legend>
<div class="row">
<label for="new-space">New space:</label>
<div class="value new-space-value">
<input id="new-space-key" name="new-space-key" type="hidden" value="dubbo">
<span class="space-input">
<input id="new-space" name="new-space" value="Dubbo" disabled="disabled">
</span>
<span class="description warning">You cannot move this page to another space because you do not have permission to remove it from this space.</span>
<div class="new-space-dropdown aui-dd-parent autocomplete"></div>
</div>
</div>
<div class="row">
<label for="new-parent-page">New parent page:</label>
<div class="value new-parent-page-value">
<span class="page-input">
<input id="new-parent-page" name="new-parent-page" value="Examples">
</span>
<span class="description">Start typing a page title to see a list of suggestions.</span>
<div class="new-parent-page-dropdown aui-dd-parent autocomplete"></div>
</div>
</div>
</fieldset>
</div>
<div class="location-info">
<div class="row">
<label>Current location:</label>
<div class="value breadcrumbs-container">
<div class="breadcrumbs-line">
<ul id="current-parent-breadcrumbs" class="breadcrumbs">
</ul>
</div>
</div>
</div>
<div class="row">
<label>New location:</label>
<div class="value breadcrumbs-container">
<div class="breadcrumbs-line">
<ul id="new-parent-breadcrumbs" class="breadcrumbs">
</ul>
</div>
</div>
</div>
</div>
</script>
<script type="text/x-template" title="movePageErrors">
<div id="move-errors" class="hidden warning"></div>
</script>
<script type="text/x-template" title="movePageBreadcrumb">
<li><a class="{2}" title="{3}" tabindex="-1"><span>{0}</span></a></li>
</script>
<script type="text/x-template" title="movePageBreadcrumbLoading">
<li class="loading"><span>Loading breadcrumbs&hellip;</span></li>
</script>
<script type="text/x-template" title="movePageBreadcrumbError">
<li class="warning last"><span>Error retrieving breadcrumbs.</span></li>
</script>
<script type="text/x-template" title="movePageNoMatchingPages">
<ol><li><span class="warning">No matching pages found.</span></li></ol>
</script>
<script type="text/x-template" title="movePageNoMatchingSpaces">
<ol><li><span class="warning">No matching spaces found.</span></li></ol>
</script>
<script type="text/x-template" title="movePageSearchPanel">
<div class="row information">
<div class="inner">
<div class="element">
Search for and select the new parent page for this page and its children.
</div>
</div>
</div>
<div id="move-page-search-container" class="row">
<div class="search-form">
<fieldset>
<legend class="assistive"><span>Search for a New Parent Page</span></legend>
<label for="move-page-search-query" class="assistive">Search keywords</label>
<input class="search-query" id="move-page-search-query">
<label for="move-page-search-space" class="assistive">Search in space</label>
<select id="move-page-search-space" class="search-space" disabled="disabled">
<option value="dubbo" selected="selected">Dubbo</option>
</select>
<input type="button" value="Search">
<div class="description warning">You cannot move this page to another space because you do not have permission to remove it from this space.</div>
</fieldset>
</div>
<div class="search-results">
</div>
</div>
</script>
<script type="text/x-template" title="movePageSearchResultsLoading">
<div class="searching">Searching…</div>
</script>
<script type="text/x-template" title="movePageHistoryPanel">
<div class="row information">
<div class="inner">
<div class="element">
Select the new parent page for this page and its children from your history.
</div>
</div>
</div>
<div id="move-page-search-container" class="row">
<div class="search-results">
</div>
</div>
</script>
<script type="text/x-template" title="movePageHistoryLoading">
<div class="searching">Loading…</div>
</script>
<script type="text/x-template" title="movePageBrowsePanel">
<div class="row information">
<div class="inner">
<div class="element">
Click to select the new parent page for this page and its children.
</div>
</div>
</div>
<div class="tree"></div>
</script>
<script type="text/x-template" title="movePagePanelLoading">
<span>Loading…</span>
</script>
<script type="text/x-template" title="movePageBrowsePanelSpace">
<ul><li id='tree-root-node-item' class='root-node-list-item'><a class='root-node' href='#'>{0}</a></li></ul>
</script>
<script type="text/x-template" title="orderingPagePanel">
<div id="orderingPlaceHolder"></div>
</script>
<script type="text/x-template" title="reorderCheckbox">
<span id="reorderRequirement"><input id="reorderCheck" type="checkbox" name="reorderFlag" title="Choose the position of this page within the list of child pages."/><label for="reorderCheck" title="Choose the position of this page within the list of child pages.">Reorder</label></span>
</script>
<script type="text/x-template" title="move-help-link">
<div class="dialog-help-link">
<a href="http://docs.atlassian.com/confluence/docs-35/Moving+a+Page" target="_blank">Help</a>
</div>
</script>
<script type="text/x-template" title="searchResultsGrid">
<table>
<thead>
<tr class="header">
<th class="search-result-title">Page Title</th>
<th class="search-result-space">Space</th>
<th class="search-result-date">Updated</th>
</tr>
</thead>
</table>
</script>
<script type="text/x-template" title="searchResultsGridCount">
<p class="search-result-count">{0}</p>
</script>
<script type="text/x-template" title="searchResultsGridRow">
<tr class="search-result">
<th class="search-result-title"><a href="{1}" class="content-type-{2}"><span>{0}</span></a></th>
<td class="search-result-space"><a class="space" href="http://10.20.160.198/wiki/display/{4}/" title="{3}">{3}</a></td>
<td class="search-result-date"><span class="date" title="{6}">{5}</span></td>
</tr>
</script>
<!-- Start restrictions section -->
<script type="text/x-template" title="page-permissions-div">
<div id="page-permissions-div">
<div id="page-permissions-editor-form">
<div id="page-permissions-error-div" class="hidden">
<a href="#" id="permissions-error-div-close">Ok</a>
<div></div>
</div>
<div id="page-permissions-type-radios" class="page-permissions-label-rows">
<div>
<input id="restrictViewRadio" type="radio" checked="checked" name="pagePermissionTypeRadio" value="view"/>
<label for="restrictViewRadio">Restrict viewing of this page</label>
<input id="restrictEditRadio" type="radio" name="pagePermissionTypeRadio" value="edit"/>
<label for="restrictEditRadio">Restrict editing of this page</label>
</div>
</div>
<div id="page-permissions-input" class="page-permissions-label-rows">
<div class="page-permissions-label">To:</div>
<div id="page-permissions-chooser-box">
<span id="page-permissions-choose-user" class="ajs-button">
<a href="#" id='userpicker-popup-link-image' onClick="var picker = window.open('http://10.20.160.198/wiki/spaces/openuserpicker.action?key=dubbo&startIndex=0&onPopupSubmit=AJS.PagePermissions.addUserPermissions', 'EntitiesPicker', 'status=yes,resizable=yes,top=100,left=200,width=700,height=680,scrollbars=yes'); picker.focus(); return false;"><img src="user_16.gif"/*tpa=http://10.20.160.198/wiki/s/en/2166/34/_/images/icons/user_16.gif*/ height=16 width=16 border=0 align="absmiddle" title="Choose users" /></a>
<a href="#" id='userpicker-popup-link-text' onClick="var picker = window.open('http://10.20.160.198/wiki/spaces/openuserpicker.action?key=dubbo&startIndex=0&onPopupSubmit=AJS.PagePermissions.addUserPermissions', 'EntitiesPicker', 'status=yes,resizable=yes,top=100,left=200,width=700,height=680,scrollbars=yes'); picker.focus(); return false;">Person...</a>
</span>
<span id="page-permissions-choose-group" class="ajs-button">
<a href="#" id='grouppicker-popup-link-image' onClick="var picker = window.open('http://10.20.160.198/wiki/spaces/opengrouppicker.action?key=dubbo&startIndex=0&actionName=dosearchgroups.action&onPopupSubmit=AJS.PagePermissions.addGroupPermissions', 'EntitiesPicker', 'status=yes,resizable=yes,top=100,left=200,width=580,height=550,scrollbars=yes'); picker.focus(); return false;"><img src="group_16.gif"/*tpa=http://10.20.160.198/wiki/s/en/2166/34/_/images/icons/group_16.gif*/ height=16 width=16 border=0 align="absmiddle" title="Choose groups" /></a>
<a href="#" id='grouppicker-popup-link-text' onClick="var picker = window.open('http://10.20.160.198/wiki/spaces/opengrouppicker.action?key=dubbo&startIndex=0&actionName=dosearchgroups.action&onPopupSubmit=AJS.PagePermissions.addGroupPermissions', 'EntitiesPicker', 'status=yes,resizable=yes,top=100,left=200,width=580,height=550,scrollbars=yes'); picker.focus(); return false;">Group...</a>
</span>
</div>
<div id="page-permissions-input-box">
<span>
<input type="text" id="page-permissions-names-input" class="input-placeholder" value="Enter user or group name" name="permissionNames" size="30" autocomplete="off"/>
</span>
<input
type="hidden"
id="page-permissions-names-hidden" /> <img height="16px" width="1px" src="spacer.gif"/*tpa=http://10.20.160.198/wiki/s/en/2166/34/_/images/border/spacer.gif*//>
<input type="button" id="add-typed-names" value="Restrict">
</div>
</div>
</div>
<div id="page-permissions-tables">
<div id="page-permissions-table-div">
<table id="page-permissions-table" class="page-permissions-table">
<tr id="page-permissions-no-views" class="marker-row">
<td colspan="3" class="page-permissions-marker-cell"><span>No view restrictions are defined for this page</span></td>
</tr>
<tr id="page-permissions-no-edits" class="marker-row">
<td colspan="3" class="page-permissions-marker-cell"><span>No edit restrictions are defined for this page</span></td>
</tr>
</table>
</div>
<div id="page-inherited-permissions-table-div" class="hidden">
<span id="page-inherited-permissions-table-desc">
<a class="icon twisty-closed">Show/Hide</a>
<a id="toggle-inherited-permissions" title="Click to see inherited restrictions">This page has restricted parent pages. It can only be seen by users who can see those parent pages.</a>
</span>
<div id="page-inherited-permissions-tables" class="hidden page-inheritance-togglable"></div>
</div>
</div>
</div>
</script>
<script type="text/x-template" title="permissions-row-template">
<tr class="permission-row">
<td class="page-permissions-marker-cell" width="20%">
<span>Viewing restricted to:</span>
</td>
<td class="permission-entity" nowrap="true" width="40%">
<span class="entity-container">
<img class="permission-entity-picture"/>
<span class="permission-entity-display-name"></span>
<span class="permission-entity-name-wrap">&nbsp;(<span class="permission-entity-name"></span>)</span>
</span>
</td>
<td class="permission-detail-column">
<div class="permission-remove-div">
<a href="#" class="remove-permission-link">Remove restriction</a>
</div>
</td>
</tr>
</script>
<script type="text/x-template" title="permissions-username-no-suggestion-template">
<ol>
<li><a href="#" class="message"><span>No matches</span></a></li>
</ol>
</script>
<script type="text/x-template" title="page-inherited-permissions-table-div-template">
<div class="page-inherited-permissions-owner-div">
<div class="page-inherited-permissions-table-desc">Viewing restrictions apply to “<a></a>”. In order to see “<span></span>”, a user must be in the following list of users and groups:</div>
<table class="page-permissions-table"></table>
</div>
</script>
<script type="text/x-template" title="page-restrictions-help-link">
<div class="dialog-help-link">
<a href="http://docs.atlassian.com/confluence/docs-35/Page+Restrictions" target="_blank">Help</a>
</div>
</script>
<!-- End restrictions section -->
<fieldset class="hidden parameters">
<input type="hidden" title="spaceKeyEncoded" value="dubbo">
<input type="hidden" title="spaceKeyDecoded" value="dubbo">
</fieldset>
<a href="#page-metadata-end" class="assistive">Skip to end of metadata</a>
<div id="page-metadata-start" class="assistive"></div>
<div class="page-metadata">
<ul>
<li class="page-metadata-item noprint">
<a id="content-metadata-page-restrictions" href="#" class="page-metadata-icon page-restrictions hidden" title="Page restrictions apply. Click the lock icon to view or edit the restriction.">
<span>Page restrictions apply</span></a> </li>
<li class="page-metadata-item noprint">
<a id="content-metadata-attachments" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/viewpageattachments.action?pageId=6950732&metadataLink=true \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/viewpageattachments.action?pageId=6950732&metadataLink=true%27" tppabs="http://10.20.160.198/wiki/pages/viewpageattachments.action?pageId=6950732&metadataLink=true" class="page-metadata-icon action-view-attachments" accessKey="a" title="Attachments: 2">
<span><span class="page-metadata-attachments-text">Attachments:</span><span class="page-metadata-attachments-count">2</span></span></a> </li>
<li class="page-metadata-modification-info" style="display: none">
Added by <a href="javascript:if(confirm(%27http://10.20.160.198/wiki/display/~william.liangf \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/display/~william.liangf%27" tppabs="http://10.20.160.198/wiki/display/~william.liangf"
class="url fn confluence-userlink" data-username="william.liangf"
>梁 飞</a>, last edited by <a href="javascript:if(confirm(%27http://10.20.160.198/wiki/display/~william.liangf \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/display/~william.liangf%27" tppabs="http://10.20.160.198/wiki/display/~william.liangf"
class="url fn confluence-userlink" data-username="william.liangf"
>梁 飞</a> on 四月 20, 2012
<span class="noprint">&nbsp;(<a id="view-change-link" href="javascript:if(confirm(%27http://10.20.160.198/wiki/pages/diffpages.action?pageId=6950732&originalId=7669785 \n\nThis file was not retrieved by Teleport Ultra, because it is addressed on a domain or path outside the boundaries set for its Starting Address. \n\nDo you want to open it from the server?%27))window.location=%27http://10.20.160.198/wiki/pages/diffpages.action?pageId=6950732&originalId=7669785%27" tppabs="http://10.20.160.198/wiki/pages/diffpages.action?pageId=6950732&originalId=7669785">view change</a>)</span>
</li>
</ul>
<div id="version-comment" class="noteMacro" style="display: none;">
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<h3><a name="DelayExport-DelayExport"></a>Delay Export</h3>
<p>(<a href="Delay+Export.htm" tppabs="http://10.20.160.198/wiki/display/dubbo/Delay+Export" title="Delay Export">+</a>) (<a href="#DelayExport-DelayExport">#</a>)</p>
<div class='panelMacro'><table class='tipMacro'><colgroup><col width='24'><col></colgroup><tr><td valign='top'><img src="check.gif" tppabs="http://10.20.160.198/wiki/images/icons/emoticons/check.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td>如果你的服务需要Warmup时间,比如初始化缓存,等待相关资源就位等,可以使用delay进行延迟暴露。</td></tr></table></div>
<p>延迟5秒暴露服务:</p>
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<script type="syntaxhighlighter" class="theme: Confluence; brush: xml; gutter: false"><![CDATA[&lt;dubbo:service delay="5000" /&gt;]]></script>
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<p>延迟到Spring初始化完成后,再暴露服务:(基于Spring的ContextRefreshedEvent事件触发暴露)</p>
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<script type="syntaxhighlighter" class="theme: Confluence; brush: xml; gutter: false"><![CDATA[&lt;dubbo:service delay="-1" /&gt;]]></script>
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<div class='panelMacro'><table class='noteMacro'><colgroup><col width='24'><col></colgroup><tr><td valign='top'><img src="warning-3.gif" tppabs="http://10.20.160.198/wiki/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b>Spring2.x初始化死锁问题</b><br />在Spring解析到&lt;dubbo:service /&gt;时,就已经向外暴露了服务,而Spring还在接着初始化其它Bean。<br/>
如果这时有请求进来,并且服务的实现类里有调用applicationContext.getBean()的用法。
<p>1. 请求线程的applicationContext.getBean()调用,先同步singletonObjects判断Bean是否存在,不存在就同步beanDefinitionMap进行初始化,并再次同步singletonObjects写入Bean实例缓存。<br/>
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2. 而Spring初始化线程,因不需要判断Bean的存在,直接同步beanDefinitionMap进行初始化,并同步singletonObjects写入Bean实例缓存。<br/>
<span class="image-wrap" style=""><img src="lock-init-context.jpg-version=1&modificationDate=1330949881000.jpg" tppabs="http://10.20.160.198/wiki/download/attachments/6950732/lock-init-context.jpg?version=1&modificationDate=1330949881000" style="border: 0px solid black" /></span></p>
<p>这样就导致getBean线程,先锁singletonObjects,再锁beanDefinitionMap,再次锁singletonObjects。<br/>
而Spring初始化线程,先锁beanDefinitionMap,再锁singletonObjects。<br/>
反向锁导致线程死锁,不能提供服务,启动不了。</p></td></tr></table></div>
<div class='panelMacro'><table class='tipMacro'><colgroup><col width='24'><col></colgroup><tr><td valign='top'><img src="check.gif" tppabs="http://10.20.160.198/wiki/images/icons/emoticons/check.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td><b>规避办法</b><br />1. 强烈建议不要在服务的实现类中有applicationContext.getBean()的调用,全部采用IoC注入的方式使用Spring的Bean。<br/>
2. 如果实在要调getBean(),可以将Dubbo的配置放在Spring的最后加载。<br/>
3. 如果不想依赖配置顺序,可以使用&lt;dubbo:provider deplay=”-1” /&gt;,使Dubbo在Spring容器初始化完后,再暴露服务。<br/>
4. 如果大量使用getBean(),相当于已经把Spring退化为工厂模式在用,可以将Dubbo的服务隔离单独的Spring容器。</td></tr></table></div>
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