GemFire 6.6

com.gemstone.gemfire
Class CopyHelper

java.lang.Object
  extended by com.gemstone.gemfire.CopyHelper

public final class CopyHelper
extends Object

A static helper for optimally creating copies. Creating copies of cache values provides improved concurrency as well as isolation. For transactions, creating a copy is the guaranteed way to enforce "Read Committed" isolation on changes to cache Entries.

Here is a simple example of how to use CopyHelper.copy

    Object o = r.get("stringBuf");
    StringBuffer s = (StringBuffer) CopyHelper.copy(o);
    s.append("... and they lived happily ever after.  The End.");
    r.put("stringBuf", s);
  

Since:
4.0
See Also:
Cloneable, Serializable, DataSerializer, GemFireCache.setCopyOnRead(boolean), CacheTransactionManager

Method Summary
static
<T> T
copy(T o)
          Makes a copy of the specified object.
 
Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Method Detail

copy

public static <T> T copy(T o)

Makes a copy of the specified object. Copies can only be made if the original is Cloneable or serializable by GemFire.

Parameters:
o - the original object that a copy is needed of
Returns:
the new instance that is a copy of of the original
Throws:
CopyException - if copying fails because a class could not be found or could not be serialized.
Since:
4.0

GemFire 6.6

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