<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<!DOCTYPE bugzilla SYSTEM "https://bugs.webkit.org/page.cgi?id=bugzilla.dtd">

<bugzilla version="5.0.4.1"
          urlbase="https://bugs.webkit.org/"
          
          maintainer="admin@webkit.org"
>

    <bug>
          <bug_id>229148</bug_id>
          
          <creation_ts>2021-08-16 09:31:52 -0700</creation_ts>
          <short_desc>[webkitcorepy] Add CallByNeed object</short_desc>
          <delta_ts>2021-08-18 09:34:09 -0700</delta_ts>
          <reporter_accessible>1</reporter_accessible>
          <cclist_accessible>1</cclist_accessible>
          <classification_id>1</classification_id>
          <classification>Unclassified</classification>
          <product>WebKit</product>
          <component>Tools / Tests</component>
          <version>WebKit Nightly Build</version>
          <rep_platform>Unspecified</rep_platform>
          <op_sys>Unspecified</op_sys>
          <bug_status>RESOLVED</bug_status>
          <resolution>FIXED</resolution>
          
          
          <bug_file_loc></bug_file_loc>
          <status_whiteboard></status_whiteboard>
          <keywords>InRadar</keywords>
          <priority>P2</priority>
          <bug_severity>Normal</bug_severity>
          <target_milestone>---</target_milestone>
          
          
          <everconfirmed>1</everconfirmed>
          <reporter name="Jonathan Bedard">jbedard</reporter>
          <assigned_to name="Jonathan Bedard">jbedard</assigned_to>
          <cc>aakash_jain</cc>
    
    <cc>dewei_zhu</cc>
    
    <cc>slewis</cc>
    
    <cc>webkit-bug-importer</cc>
          

      

      

      

          <comment_sort_order>oldest_to_newest</comment_sort_order>  
          <long_desc isprivate="0" >
    <commentid>1784545</commentid>
    <comment_count>0</comment_count>
    <who name="Jonathan Bedard">jbedard</who>
    <bug_when>2021-08-16 09:31:52 -0700</bug_when>
    <thetext>It&apos;s often the case that we want to defer the computation of an object until we actually need that object.  We should add a small wrapper object that allows us to do this in webkitcorepy.</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1784548</commentid>
    <comment_count>1</comment_count>
    <who name="Jonathan Bedard">jbedard</who>
    <bug_when>2021-08-16 09:33:27 -0700</bug_when>
    <thetext>&lt;rdar://problem/81817705&gt;</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1784554</commentid>
    <comment_count>2</comment_count>
      <attachid>435612</attachid>
    <who name="Jonathan Bedard">jbedard</who>
    <bug_when>2021-08-16 09:43:09 -0700</bug_when>
    <thetext>Created attachment 435612
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1784984</commentid>
    <comment_count>3</comment_count>
      <attachid>435612</attachid>
    <who name="">dewei_zhu</who>
    <bug_when>2021-08-17 16:34:08 -0700</bug_when>
    <thetext>Comment on attachment 435612
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=435612&amp;action=review

&gt; Tools/Scripts/libraries/webkitcorepy/webkitcorepy/defer.py:24
&gt; +class Defer(object):

It might cause confusion with &quot;Deferred&quot; in twisted module, which is more about async operation.
For this one, we want to defer the evaluation of &apos;callback&apos;, this is more like lazily evaluated. 
This also limits the callback to be a callable that takes no argument, would that work for what it&apos;s designed for?

&gt; Tools/Scripts/libraries/webkitcorepy/webkitcorepy/tests/defer_unittest.py:34
&gt; +

Maybe we also want to have a test case that the evaluation is actually deferred.

value = []
d = Defer(lambda: value.append(&apos;foo&apos;))
self.assertEqual(len(value), 0)
d.value
self.assertEqual(len(value), 1)
self.assertEqual(value[0], &apos;foo&apos;).</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1785113</commentid>
    <comment_count>4</comment_count>
      <attachid>435768</attachid>
    <who name="Jonathan Bedard">jbedard</who>
    <bug_when>2021-08-18 08:24:17 -0700</bug_when>
    <thetext>Created attachment 435768
Patch</thetext>
  </long_desc><long_desc isprivate="0" >
    <commentid>1785134</commentid>
    <comment_count>5</comment_count>
    <who name="Jonathan Bedard">jbedard</who>
    <bug_when>2021-08-18 09:34:09 -0700</bug_when>
    <thetext>Committed r281191 (240635@main): &lt;https://commits.webkit.org/240635@main&gt;</thetext>
  </long_desc>
      
          <attachment
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              ispatch="1"
              isprivate="0"
          >
            <attachid>435612</attachid>
            <date>2021-08-16 09:43:09 -0700</date>
            <delta_ts>2021-08-18 08:24:16 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-229148-20210816094308.patch</filename>
            <type>text/plain</type>
            <size>8557</size>
            <attacher name="Jonathan Bedard">jbedard</attacher>
            
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          </attachment>
          <attachment
              isobsolete="0"
              ispatch="1"
              isprivate="0"
          >
            <attachid>435768</attachid>
            <date>2021-08-18 08:24:17 -0700</date>
            <delta_ts>2021-08-18 08:24:17 -0700</delta_ts>
            <desc>Patch</desc>
            <filename>bug-229148-20210818082416.patch</filename>
            <type>text/plain</type>
            <size>8507</size>
            <attacher name="Jonathan Bedard">jbedard</attacher>
            
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          </attachment>
      

    </bug>

</bugzilla>