Shared Object editing

[Cristian Rusu]

Hello

I am building a chat room.
I have a SO on server to keep the message conversation.
I need to know how can I access  that SO data from server side (java)?


I can't seems to be able to convert back to a ObjectMap added to SO using SO.getAttribute(msgid)



some code is
ObjectMap<String, Object> msg = new ObjectMap<String, Object>();
msg.put("id", id);
msg.put("txt", message);

SO.setAttribute(Integer.toString(id), msg);


Now how do I get that msg restored so I can read all the Map elements?

Thank you!

_______________
Sincerely
Cristian Rusu
==============
www.crilance.com
Web Development & Electronic Publishing

Chat: crirus74 Crirus crirus@...

Contact Me:

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[javaguy]

Hi Cristian

Cristian Rusu schrieb:
  > some code is
> ObjectMap<String, Object> msg = new ObjectMap<String, Object>();
> msg.put("id", id);
> msg.put("txt", message);
>
> SO.setAttribute(Integer.toString(id), msg);
>
> Now how do I get that msg restored so I can read all the Map elements?

just cast it to the type you expect.
this code snipped should work for your needs:

ObjectMap<String, Object> msg = (ObjectMap<String, Object>)
SO.getAttribute(Integer.toString(id));



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[Cristian Rusu]

On Thu, Jul 9, 2009 at 14:23, javaguy <javaguy@...> wrote:

Hi Cristian

Cristian Rusu schrieb:
 > some code is

ObjectMap<String, Object> msg = new ObjectMap<String, Object>();
msg.put("id", id);
msg.put("txt", message);

SO.setAttribute(Integer.toString(id), msg);

Now how do I get that msg restored so I can read all the Map elements?

just cast it to the type you expect.
this code snipped should work for your needs:

ObjectMap<String, Object> msg = (ObjectMap<String, Object>) SO.getAttribute(Integer.toString(id));

Well I tried that, and got some warnings about not verified casting...
When at runtime, I get exception about casting.
 

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[javaguy]

Cristian Rusu schrieb:

> On Thu, Jul 9, 2009 at 14:23, javaguy <javaguy@...> wrote:
>
>> Hi Cristian
>>
>> Cristian Rusu schrieb:
>>  > some code is
>>
>>> ObjectMap<String, Object> msg = new ObjectMap<String, Object>();
>>> msg.put("id", id);
>>> msg.put("txt", message);
>>>
>>> SO.setAttribute(Integer.toString(id), msg);
>>>
>>> Now how do I get that msg restored so I can read all the Map elements?
>>>
>> just cast it to the type you expect.
>> this code snipped should work for your needs:
>>
>> ObjectMap<String, Object> msg = (ObjectMap<String, Object>)
>> SO.getAttribute(Integer.toString(id));
>>
>
> Well I tried that, and got some warnings about not verified casting...
> When at runtime, I get exception about casting.

Don't worry about the warning. You just have to ensure that the object
you want to read and the object you have stored are of the same type.
But that condition is given in the example.

The ClassCastException is another problem.
Lets debug the code.
1) Ensure that the 'id' you store is the same 'id' you read from.
debug your code and compare the IDs or just try to use a fix number
instead of 'Integer.toString(id)'.
2) Get the value object for that ID
Object o = SO.getAttribute(Integer.toString(id));
2.1) check that this object is not 'null'
2.2) have a look inside the object with your debugger. has it the
expected content?
3) does anyone overwrite the attribute in the SO with another object type?

wouldn't it be easier to store the message only as
SO.setAttribute(Integer.toString(id), message);
no information would get lost ... ;)

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[Cristian Rusu]

On Thu, Jul 9, 2009 at 18:41, javaguy <javaguy@...> wrote:

Cristian Rusu schrieb:

On Thu, Jul 9, 2009 at 14:23, javaguy <javaguy@...> wrote:

Hi Cristian

Cristian Rusu schrieb:
 > some code is

ObjectMap<String, Object> msg = new ObjectMap<String, Object>();
msg.put("id", id);
msg.put("txt", message);

SO.setAttribute(Integer.toString(id), msg);

Now how do I get that msg restored so I can read all the Map elements?

just cast it to the type you expect.
this code snipped should work for your needs:

ObjectMap<String, Object> msg = (ObjectMap<String, Object>)
SO.getAttribute(Integer.toString(id));

Well I tried that, and got some warnings about not verified casting...
When at runtime, I get exception about casting.

Don't worry about the warning. You just have to ensure that the object you want to read and the object you have stored are of the same type. But that condition is given in the example.

The ClassCastException is another problem.
Lets debug the code.
1) Ensure that the 'id' you store is the same 'id' you read from.
debug your code and compare the IDs or just try to use a fix number instead of 'Integer.toString(id)'.
2) Get the value object for that ID
Object o = SO.getAttribute(Integer.toString(id));
2.1) check that this object is not 'null'
2.2) have a look inside the object with your debugger. has it the expected content?
3) does anyone overwrite the attribute in the SO with another object type?

wouldn't it be easier to store the message only as
SO.setAttribute(Integer.toString(id), message);
no information would get lost ... ;)

The ID is fine, my msg is more complex than just ID and text, just not mentioned here.
Object o is not null but I can't much recognize it by expanding and reading through properties in variable window, so I have no idea what is actually extracting from SO into obj o.
Nobody work on the SO but the function that also read it.

What I try to accomplish is to edit back a msg line but keep the old msg date and few other things related to it.

I'll dig more into the object tomorrow and see

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[Dominick Accattato-2]

In debug mode, make sure "Show Logical Structure" is shown.  It makes reading Map objects much easier.

On Thu, Jul 9, 2009 at 3:03 PM, Cristian Rusu <crirus@...> wrote:

On Thu, Jul 9, 2009 at 18:41, javaguy <javaguy@...> wrote:

Cristian Rusu schrieb:

On Thu, Jul 9, 2009 at 14:23, javaguy <javaguy@...> wrote:

Hi Cristian

Cristian Rusu schrieb:
 > some code is

ObjectMap<String, Object> msg = new ObjectMap<String, Object>();
msg.put("id", id);
msg.put("txt", message);

SO.setAttribute(Integer.toString(id), msg);

Now how do I get that msg restored so I can read all the Map elements?

just cast it to the type you expect.
this code snipped should work for your needs:

ObjectMap<String, Object> msg = (ObjectMap<String, Object>)
SO.getAttribute(Integer.toString(id));

Well I tried that, and got some warnings about not verified casting...
When at runtime, I get exception about casting.

Don't worry about the warning. You just have to ensure that the object you want to read and the object you have stored are of the same type. But that condition is given in the example.

The ClassCastException is another problem.
Lets debug the code.
1) Ensure that the 'id' you store is the same 'id' you read from.
debug your code and compare the IDs or just try to use a fix number instead of 'Integer.toString(id)'.
2) Get the value object for that ID
Object o = SO.getAttribute(Integer.toString(id));
2.1) check that this object is not 'null'
2.2) have a look inside the object with your debugger. has it the expected content?
3) does anyone overwrite the attribute in the SO with another object type?

wouldn't it be easier to store the message only as
SO.setAttribute(Integer.toString(id), message);
no information would get lost ... ;)

The ID is fine, my msg is more complex than just ID and text, just not mentioned here.
Object o is not null but I can't much recognize it by expanding and reading through properties in variable window, so I have no idea what is actually extracting from SO into obj o.
Nobody work on the SO but the function that also read it.

What I try to accomplish is to edit back a msg line but keep the old msg date and few other things related to it.

I'll dig more into the object tomorrow and see

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Red5 mailing list
Red5@...
http://osflash.org/mailman/listinfo/red5_osflash.org

_______________________________________________
Red5 mailing list
Red5@...
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[javaguy]

Cristian Rusu schrieb:

> On Thu, Jul 9, 2009 at 18:41, javaguy <javaguy@...> wrote:
>
>> Cristian Rusu schrieb:
>>
>>  On Thu, Jul 9, 2009 at 14:23, javaguy <javaguy@...> wrote:
>>>  Hi Cristian
>>>> Cristian Rusu schrieb:
>>>>  > some code is
>>>>
>>>>  ObjectMap<String, Object> msg = new ObjectMap<String, Object>();
>>>>> msg.put("id", id);
>>>>> msg.put("txt", message);
>>>>>
>>>>> SO.setAttribute(Integer.toString(id), msg);
>>>>>
>>>>> Now how do I get that msg restored so I can read all the Map elements?
>>>>>
>>>>>  just cast it to the type you expect.
>>>> this code snipped should work for your needs:
>>>>
>>>> ObjectMap<String, Object> msg = (ObjectMap<String, Object>)
>>>> SO.getAttribute(Integer.toString(id));
>>>>
>>>>
>>> Well I tried that, and got some warnings about not verified casting...
>>> When at runtime, I get exception about casting.
>>>
>> Don't worry about the warning. You just have to ensure that the object you
>> want to read and the object you have stored are of the same type. But that
>> condition is given in the example.
>>
>> The ClassCastException is another problem.
>> Lets debug the code.
>> 1) Ensure that the 'id' you store is the same 'id' you read from.
>> debug your code and compare the IDs or just try to use a fix number instead
>> of 'Integer.toString(id)'.
>> 2) Get the value object for that ID
>> Object o = SO.getAttribute(Integer.toString(id));
>> 2.1) check that this object is not 'null'
>> 2.2) have a look inside the object with your debugger. has it the expected
>> content?
>> 3) does anyone overwrite the attribute in the SO with another object type?
>>
>> wouldn't it be easier to store the message only as
>> SO.setAttribute(Integer.toString(id), message);
>> no information would get lost ... ;)
>>
>
>
> The ID is fine, my msg is more complex than just ID and text, just not
> mentioned here.
> Object o is not null but I can't much recognize it by expanding and reading
> through properties in variable window, so I have no idea what is actually
> extracting from SO into obj o.
> Nobody work on the SO but the function that also read it.
>
> What I try to accomplish is to edit back a msg line but keep the old msg
> date and few other things related to it.
>
> I'll dig more into the object tomorrow and see

sorry, but currently I don't have a glue what's wrong or an idea to help
you. I store common java objects as well as Sets, Lists and some own
object types and I'm always able to write/read them to/from SO.

I still use red5 v0.7. Maybe you use already 0.8? Is there a difference
in storing/reading or at the ObjectMap? I don't know ...

I tried the following code in my environment.
my ID was fix (1)

ObjectMap<String, Object> msgWrite = new ObjectMap<String, Object>();
msgWrite.put("id", 1);
msgWrite.put("txt", "test");
SO.setAttribute("1", msgWrite);
               
Object o = SO.getAttribute("1");
try
{
   ObjectMap<String, Object> msgRead = (ObjectMap<String, Object>) o;
   Integer id = (Integer) msgRead.get("id");
   String text = (String) msgRead.get("txt");
   System.out.println(id+":"+text);
}
catch(Exception e)
{
   e.printStackTrace();
}

This code run fine without any error.

Please correct me if I'm wrong with my next assumption. The objects you
store inside the ObjectMap should implement Serializable. So you may
have stored some object types inside the ObjectMap that do not implement
Serializable?

Maybe any others have some more hints to solve your problem.

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[Cristian Rusu]

On Fri, Jul 10, 2009 at 13:00, javaguy <javaguy@...> wrote:

Cristian Rusu schrieb:

On Thu, Jul 9, 2009 at 18:41, javaguy <javaguy@...> wrote:

Cristian Rusu schrieb:

 On Thu, Jul 9, 2009 at 14:23, javaguy <javaguy@...> wrote:

 Hi Cristian

Cristian Rusu schrieb:
 > some code is

 ObjectMap<String, Object> msg = new ObjectMap<String, Object>();

msg.put("id", id);
msg.put("txt", message);

SO.setAttribute(Integer.toString(id), msg);

Now how do I get that msg restored so I can read all the Map elements?

 just cast it to the type you expect.

this code snipped should work for your needs:

ObjectMap<String, Object> msg = (ObjectMap<String, Object>)
SO.getAttribute(Integer.toString(id));

Well I tried that, and got some warnings about not verified casting...
When at runtime, I get exception about casting.

Don't worry about the warning. You just have to ensure that the object you
want to read and the object you have stored are of the same type. But that
condition is given in the example.

The ClassCastException is another problem.
Lets debug the code.
1) Ensure that the 'id' you store is the same 'id' you read from.
debug your code and compare the IDs or just try to use a fix number instead
of 'Integer.toString(id)'.
2) Get the value object for that ID
Object o = SO.getAttribute(Integer.toString(id));
2.1) check that this object is not 'null'
2.2) have a look inside the object with your debugger. has it the expected
content?
3) does anyone overwrite the attribute in the SO with another object type?

wouldn't it be easier to store the message only as
SO.setAttribute(Integer.toString(id), message);
no information would get lost ... ;)

The ID is fine, my msg is more complex than just ID and text, just not
mentioned here.
Object o is not null but I can't much recognize it by expanding and reading
through properties in variable window, so I have no idea what is actually
extracting from SO into obj o.
Nobody work on the SO but the function that also read it.

What I try to accomplish is to edit back a msg line but keep the old msg
date and few other things related to it.

I'll dig more into the object tomorrow and see

sorry, but currently I don't have a glue what's wrong or an idea to help you. I store common java objects as well as Sets, Lists and some own object types and I'm always able to write/read them to/from SO.

I still use red5 v0.7. Maybe you use already 0.8? Is there a difference in storing/reading or at the ObjectMap? I don't know ...

I tried the following code in my environment.
my ID was fix (1)

ObjectMap<String, Object> msgWrite = new ObjectMap<String, Object>();
msgWrite.put("id", 1);
msgWrite.put("txt", "test");
SO.setAttribute("1", msgWrite);
               
Object o = SO.getAttribute("1");
try
{
 ObjectMap<String, Object> msgRead = (ObjectMap<String, Object>) o;
 Integer id = (Integer) msgRead.get("id");
 String text = (String) msgRead.get("txt");
 System.out.println(id+":"+text);
}
catch(Exception e)
{
 e.printStackTrace();
}

This code run fine without any error.

Please correct me if I'm wrong with my next assumption. The objects you store inside the ObjectMap should implement Serializable. So you may have stored some object types inside the ObjectMap that do not implement Serializable?

Maybe any others have some more hints to solve your problem.

Worked like a charm, maybe I was too tired yesterday, I don't even have to convert o to msgRead to extract does fields.

Thank you!

 

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