io.prestosql.execution.buffer

Enum BufferState

java.lang.Object

java.lang.Enum<BufferState>

io.prestosql.execution.buffer.BufferState

All Implemented Interfaces:

Serializable, Comparable<BufferState>

public enum BufferState
extends Enum<BufferState>

Enum Constant Summary

Enum Constants

Enum Constant and Description
FAILED Buffer has failed.
FINISHED No more buffers can be added and all pages have been consumed.
FLUSHING No more pages or buffers can be added, and buffer is waiting for the final pages to be consumed.
NO_MORE_BUFFERS No more buffers can be added.
NO_MORE_PAGES No more pages can be added.
OPEN Additional buffers can be added.

Field Summary

Fields

Modifier and Type	Field and Description
static Set<BufferState>	TERMINAL_BUFFER_STATES

Method Summary

Modifier and Type	Method and Description
boolean	canAddBuffers()
boolean	canAddPages()
boolean	isTerminal()
static BufferState	valueOf(String name) Returns the enum constant of this type with the specified name.
static BufferState[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

OPEN

public static final BufferState OPEN

Additional buffers can be added. Any next state is allowed.

NO_MORE_BUFFERS

public static final BufferState NO_MORE_BUFFERS

No more buffers can be added. Next state is FLUSHING.

NO_MORE_PAGES

public static final BufferState NO_MORE_PAGES

No more pages can be added. Next state is FLUSHING.

FLUSHING

public static final BufferState FLUSHING

No more pages or buffers can be added, and buffer is waiting for the final pages to be consumed. Next state is FINISHED.

FINISHED

public static final BufferState FINISHED

No more buffers can be added and all pages have been consumed. This is the terminal state.

FAILED

public static final BufferState FAILED

Buffer has failed. No more buffers or pages can be added. Readers will be blocked, as to not communicate a finished state. It is assumed that the reader will be cleaned up elsewhere. This is the terminal state.

Field Detail

TERMINAL_BUFFER_STATES

public static final Set<BufferState> TERMINAL_BUFFER_STATES

Method Detail

values

public static BufferState[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (BufferState c : BufferState.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static BufferState valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null

canAddPages

public boolean canAddPages()

canAddBuffers

public boolean canAddBuffers()

isTerminal

public boolean isTerminal()