MemcacheSerialization (Google App Engine API for Java)

com.google.appengine.api.memcache

Class MemcacheSerialization

  • java.lang.Object
    • com.google.appengine.api.memcache.MemcacheSerialization


  • public class MemcacheSerialization
    extends java.lang.Object
    Static serialization helpers shared by MemcacheServiceImpl and LocalMemcacheService. This class is thread-safe.
    • Field Detail

      • USE_THREAD_CONTEXT_CLASSLOADER_PROPERTY

        public static final java.lang.String USE_THREAD_CONTEXT_CLASSLOADER_PROPERTY
        See Also:
        Constant Field Values
    • Method Detail

      • deserialize

        public static java.lang.Object deserialize(byte[] value,
                                                   int flags)
                                            throws java.lang.ClassNotFoundException,
                                                   java.io.IOException
        Deserialize the object, according to its flags. This would have private visibility, but is also used by LocalMemcacheService for the increment operation.
        Parameters:
        value -
        flags -
        Returns:
        the Object originally stored
        Throws:
        java.lang.ClassNotFoundException - if the object can't be re-instantiated due to being an unlocatable type
        java.io.IOException - if the object can't be re-instantiated for some other reason
      • makePbKey

        public static byte[] makePbKey(java.lang.Object key)
                                throws java.io.IOException
        Converts the user's key Object into a byte[] for the MemcacheGetRequest. Because the underlying service has a length limit, we actually use the SHA1 hash of the serialized object as its key if it's not a basic type. For the basic types (that is, String, Boolean, and the fixed-point numbers), we use a human-readable representation.
        Parameters:
        key -
        Returns:
        hash result. For the key null, the hash is also null.
        Throws:
        java.io.IOException
      • serialize

        public static MemcacheSerialization.ValueAndFlags serialize(java.lang.Object value)
                                                             throws java.io.IOException
        Parameters:
        value -
        Returns:
        the ValueAndFlags containing a serialized representation of the Object and the flags to hint deserialization.
        Throws:
        java.io.IOException - for serialization errors, normally due to a non-serializable object type

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