Average Size of an object stored in the cache

Hi,
I am trying to query coherence and get the data in to my client. I am using Jconsole to monitor coherence. Is there a way I can find the average size of the object stored in the cache in bytes, so that I can determine how many bytes are sent over the network from coherence back to my client?
-Regards,
Mayuresh

If you are using binary unit calculator, you can get object size information from MBean.
You should check cache MBean on back tier. "Size" attribute is number of entries in this instance of backing map and "Units" attribute would be size in bytes (but only if binary unit calculator is configured).
Alternatively, if you interested in traffic, you could check extend proxy service MBean in "ConnectionManager" group. It has "TotalBytesSent" and "TotalBytesReceived" attributes.

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Hi, I have the question about if the coherence caches the value from the cache? I believe it does from my test, just want to get the confirmation.
I like to use an example to describe my question. For example:
If (key1, value1) are in the cache1, (value1 is an object),
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I am asking this question because I found a problem in our project when use coherence. As the above example, if I use value1 = cache1.get(key1), and in our project, value1 object has a set method to change one of its internal attributes, and this method was indeed invoked after value1 get from cache1. Then in another class, value2 = cache1.get(key1) is called again, and I found out that value2's attribute will have the modified value, even cache1.put(key1, value1) is never invoked in the first place.
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Thanks

You observation is correct. More specifically for cache topologies which include an in-process cache Coherence may return the same object reference for repeated get requests on the same key. I say "may" because for any variety of reasons we may also have to retrieve a fresh copy from a remote cache server. When possible we will return existing objects for performance reasons avoiding costly things like network hops, and de-serialization. Any modifications made to an object returned from the cache will not be made automatically available to other cluster members. Additionally if these modifications are made concurrently with another thread performing a cache.put() on the same value could result in a corrupt cached value if your serialization methods are not thread-safe. Best practice dictates that unless you are sure that you are using a cache topology which does not include an in-process cache that you treat the values returned from the cache as immutable, and instead deep clone() it before making any modifications.
The distributed-scheme and remote-scheme are the only types of caches which do not include in-process caching, and thus always return "mutation safe" values. The most common in-process cache topology is near-scheme, but others include replicated-scheme, optimistic-scheme, local-scheme, and the programatically created ContinuousQueryCache.
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Sholdnt the cache be cleared before an OutOfMemory exceptio

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As a quick test for cookie or cache problems you can try to switch Private Browsing mode on to see if that allows to log in.
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Want to know the size of Session Object

Hi,
There are around 100 objects stored in my application session.i want to know the size of Session object.
For this i perform the following code:
Enumeration enu=request.getSession().getAttributeNames();
int i=0;
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String obj_name=(String)enu.nextElement();
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Anurag_Tripathi wrote:
Hi,
There are around 100 objects stored in my application session.i want to know the size of Session object.
For this i perform the following code:First, that code makes no sense. Second, I highly recommend using a [Java profiler|http://www.google.com/search?q=java+profiler] to measure your application's performance. It will be much easier than trying to cobble together code to do this on your own.
~

I need to add the values stored in the session object into the html textbox

Dear Sir,
i have been trying to create an edit employee details page
What i have done till now is as follow:
1. Got employee id from HTML page.
2. Compared it with the id stored in the database.
3. If the id is correct then pulled the record of the corresponding employee and stored it in the session object.
4. Dispatched the session values to another servlet EditEmpDetails2.java
what i need to do now
5. Now i need to set the session values in the text field of the html form
6. I also need to be able to edit those vales and store the edited values in the database.
Please help me as i have tried doing it for 1 week without any clues
i have tried to create a html page which is something like this:
<html>
<head>
<title>Edit Employee Details Page</title>
<body BGCOLOR="red" text="black">
<h1 ><font color="black">Edit Employee Details Page</font></h1>
<form action = "EditEmpDetails" method="Get">
<table width="50% align="center"
<tr><td>Employee ID: </td>
<td><INPUT TYPE="TEXT" name="employeeid"<br></td></tr>
<tr><td><center><input type="submit" value="submit"></center></td></tr>
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</form>
</body>
</html>
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Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
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PreparedStatement stat = con.prepareStatement(query);
System.out.println(stat);
stat.setString(1,X);
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String F = rs.getString(6);
session.setAttribute("address", F);
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String H = rs.getString(8);
session.setAttribute("phone", H);
String I = rs.getString(9);
session.setAttribute("mobile", I);
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I do not know how to put the values stored in the session object into the html text box

3. If the id is correct then pulled the record of the corresponding employee and stored it in the session object.do you really need to store this in session object?
5. Now i need to set the session values in the text field of the html form which form? in a new html/jsp page? i suggest go for a JSP
In your JSP page use JSP expression tags to put the session attributes.
it's something like : <input type='text' name='employeeid' value='<%= session.getAttribute("employeeid") %>' >and you need to generateanother servlet for saving the details/modifications to the database.
I think i m clear enough.
if you need more clarifications. just try it and then post your problem.
Diablo

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myforum wrote:
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<b>AND</b>
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The following is a general list of things you may try when the issue is not in a specific file, and when it is not caused by issues with opening a file from external media, see below. You may have tried/done some of them already; 1) and 2) are the easy ones for temporary strangenesses, and 3) and 4) are specifically aimed at possibly corrupt preferences); 5) is a list in itself, and 6) is the last resort.
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Average Size of an object stored in the cache

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