|Oracle® Coherence Developer's Guide for Oracle Coherence
Part Number E13818-01
Use Coherence caches to cache value objects. These objects may represent data from any source, either internal (such as session data, transient data, and so on) or external (such as a database, mainframe, and so on).
Objects placed in the cache must be serializable. The simplest approach to doing this is to implement
java.io.Serializable. For higher performance, Coherence also supports the
java.io.Externalizable and (even faster)
com.tangosol.io.ExternalizableLite interfaces. The primary difference between
ExternalizableLite is the I/O stream used. In most cases, porting from one to the other is simple.
Note:Remember, when serializing an object, Java serialization automatically crawls every visible object (by using object references, including collections like
List). As a result, cached objects should not refer to their parent objects directly (holding onto an identifying value like an integer is OK).
Objects that implement their own serialization routines are not affected.
Any objects that implement
com.tangosol.run.xml.XmlBean will automatically support
ExternalizableLite. For more details, see the API Javadoc for