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From "Joe Bowser (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CB-9353) Memory issue in Android version when passing a large number of JSON objects in either direction
Date Mon, 20 Jul 2015 15:30:04 GMT

    [ https://issues.apache.org/jira/browse/CB-9353?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14633695#comment-14633695
] 

Joe Bowser edited comment on CB-9353 at 7/20/15 3:29 PM:
---------------------------------------------------------

Seriously, I've been waiting around for a reason to do this instead of doing pre-mature optimization,
because premature optimization is bad.


was (Author: bowserj):
Seriously, I've been waiting around for a reason to do this instead of doing pre-mature optimization.

> Memory issue in Android version when passing a large number of JSON objects in either
direction
> -----------------------------------------------------------------------------------------------
>
>                 Key: CB-9353
>                 URL: https://issues.apache.org/jira/browse/CB-9353
>             Project: Apache Cordova
>          Issue Type: Bug
>          Components: Android
>            Reporter: Chris Brody
>            Assignee: Joe Bowser
>            Priority: Critical
>             Fix For: 5.0.0
>
>
> As reported in https://github.com/litehelpers/Cordova-sqlite-storage/issues/18: when
an array with a very large number of JSON objects is sent from Javascript to Java, I would
encounter a memory problem in JSON as called by CordovaPlugin.execute():
> E/art     (22291): Throwing OutOfMemoryError "Failed to allocate a 28 byte allocation
with 20 free bytes and 20B until OOM" (recursive case)
> E/art     (22291): "JavaBridge" prio=5 tid=25 Runnable
> E/art     (22291):   | group="main" sCount=0 dsCount=0 obj=0x12de6820 self=0xb73ae620
> E/art     (22291):   | sysTid=22377 nice=0 cgrp=apps sched=0/0 handle=0xb73aead8
> E/art     (22291):   | state=R schedstat=( 0 0 0 ) utm=653 stm=94 core=1 HZ=100
> E/art     (22291):   | stack=0xa4ee1000-0xa4ee3000 stackSize=1036KB
> E/art     (22291):   | held mutexes= "mutator lock"(shared held)
> E/art     (22291):   at java.util.LinkedHashMap.addNewEntry(LinkedHashMap.java:195)
> E/art     (22291):   at java.util.HashMap.put(HashMap.java:403)
> E/art     (22291):   at org.json.JSONObject.put(JSONObject.java:264)
> E/art     (22291):   at org.json.JSONTokener.readObject(JSONTokener.java:385)
> E/art     (22291):   at org.json.JSONTokener.nextValue(JSONTokener.java:100)
> E/art     (22291):   at org.json.JSONTokener.readArray(JSONTokener.java:430)
> E/art     (22291):   at org.json.JSONTokener.nextValue(JSONTokener.java:103)
> E/art     (22291):   at org.json.JSONTokener.readObject(JSONTokener.java:385)
> E/art     (22291):   at org.json.JSONTokener.nextValue(JSONTokener.java:100)
> E/art     (22291):   at org.json.JSONTokener.readArray(JSONTokener.java:430)
> E/art     (22291):   at org.json.JSONTokener.nextValue(JSONTokener.java:103)
> E/art     (22291):   at org.json.JSONArray.<init>(JSONArray.java:92)
> E/art     (22291):   at org.json.JSONArray.<init>(JSONArray.java:108)
> E/art     (22291):   at org.apache.cordova.CordovaPlugin.execute(CordovaPlugin.java:64)
> E/art     (22291):   at org.apache.cordova.PluginManager.execHelper(PluginManager.java:242)
> E/art     (22291):   at org.apache.cordova.PluginManager.exec(PluginManager.java:227)
> E/art     (22291):   at org.apache.cordova.ExposedJsApi.exec(ExposedJsApi.java:53)
> E/art     (22291):   at org.chromium.base.SystemMessageHandler.nativeDoRunLoopOnce(Native
method)
> E/art     (22291):   at org.chromium.base.SystemMessageHandler.handleMessage(SystemMessageHandler.java:53)
> E/art     (22291):   at android.os.Handler.dispatchMessage(Handler.java:102)
> E/art     (22291):   at android.os.Looper.loop(Looper.java:135)
> E/art     (22291):   at android.os.HandlerThread.run(HandlerThread.java:61)
> The workaround, which took me some hard work to develop and test, is to send my data
as a flat array which the Java code has to interpret very carefully.
> In addition, in case the Java code attempts to create an array with a very large number
of JSON objects in order to send a response I get similar problem. The workaround was again
to format the response data as a flat array and interpret it very carefully on the Javascript
side.
> While I do have a workaround I find this to be very clumsy and hope we can find a better
solution. I am happy to make an isolated test plugin to reproduce and demonstrate this issue
if the Apache Cordova project is serious about trying to fix it.



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