water.rapids

Class Env

java.lang.Object

water.Iced

water.rapids.Env

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, Freezable

public class Env
extends Iced

Execute a set of instructions in the context of an H2O cloud. An Env (environment) object is a classic stack of values used during execution of an AST. The stack is hidden in the normal Java execution stack and is not explicit. For efficiency, reference counting is employed to recycle objects already in use rather than creating copies upon copies (a la R). When a Frame is `pushed` on to the stack, its reference count is incremented by 1. When a Frame is `popped` off of the stack, its reference count is decremented by 1. When the reference count is 0, the Env instance will dispose of the object. All objects live and die by the Env's that create them. That means that any object not created by an Env instance shalt not be DKV.removed. Therefore, the Env class is a stack of values + an API for reference counting.

See Also:

Serialized Form

Method Summary

Methods

Modifier and Type	Method and Description
Env	read_impl(AutoBuffer ab) Implementation of the Iced serialization protocol, only called by auto-genned code.
<V extends Val> V	returning(V val)
int	sp()
java.lang.String	toString()
AutoBuffer	write_impl(AutoBuffer ab) Implementation of the Iced serialization protocol, only called by auto-genned code.

Methods inherited from class water.Iced

clone, copyOver, frozenType, read, readExternal, readJSON_impl, readJSON, toJsonString, write, writeExternal, writeJSON_impl, writeJSON

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Detail

sp

public int sp()

returning

public <V extends Val> V returning(V val)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object

write_impl

public AutoBuffer write_impl(AutoBuffer ab)

Description copied from class: Iced

Implementation of the Iced serialization protocol, only called by auto-genned code. Not intended to be called by user code. Override only for custom Iced serializers.

Specified by:

write_impl in interface Freezable

Overrides:

write_impl in class Iced

Parameters:

ab - AutoBuffer to write this object to.

Returns:

Returns the original AutoBuffer for flow-coding.

read_impl

public Env read_impl(AutoBuffer ab)

Description copied from class: Iced

Implementation of the Iced serialization protocol, only called by auto-genned code. Not intended to be called by user code. Override only for custom Iced serializers.

Specified by:

read_impl in interface Freezable

Overrides:

read_impl in class Iced

Parameters:

ab - AutoBuffer to read this object from.

Returns:

Returns a new instance of object reconstructed from AutoBuffer.