Package org.jgrapes.webconsole.base

Class KVStoreBasedConsolePolicy

java.lang.Object

org.jgrapes.core.internal.ComponentVertex

org.jgrapes.core.Component

org.jgrapes.webconsole.base.KVStoreBasedConsolePolicy

All Implemented Interfaces:

Iterable<ComponentType>, Channel, ComponentType, Eligible, Manager

public class KVStoreBasedConsolePolicy
extends Component

A component that restores the console layout using key/value events for persisting the data between sessions.

This component requires another component that handles the key/value store events (KeyValueStoreUpdate, KeyValueStoreQuery) used by this component for implementing persistence. When the web console becomesready, this policy sends a query for the persisted data.

When the web console has been prepared, the policy sends the last layout as retrieved from persistent storage to the web console and then generates render events for all web console components contained in this layout.

Each time the layout is changed in the web console, the web console sends the new layout data and this component updates the persistent storage accordingly.

Nested Class Summary

Nested classes/interfaces inherited from interface org.jgrapes.core.Channel

Channel.Default

Field Summary

Fields

Modifier and Type	Field	Description
protected static final com.fasterxml.jackson.databind.ObjectMapper	mapper	The mapper.

Fields inherited from class org.jgrapes.core.Component

logger

Fields inherited from interface org.jgrapes.core.Channel

BROADCAST, SELF

Constructor Summary

Constructors

Constructor	Description
KVStoreBasedConsolePolicy()	Creates a new component with its channel set to itself.
KVStoreBasedConsolePolicy(Channel componentChannel)	Creates a new component with its channel set to the given channel.

Method Summary

Modifier and Type	Method	Description
void	onConsoleLayoutChanged(ConsoleLayoutChanged event, ConsoleConnection channel)	Forward layout changed event to browser session scoped storage.
void	onConsolePrepared(ConsolePrepared event, ConsoleConnection channel)	Create browser session scoped storage and forward event to it.

Methods inherited from class org.jgrapes.core.Component

channel, component, defaultCriterion, isEligibleFor, setName

Methods inherited from class org.jgrapes.core.internal.ComponentVertex

activeEventPipeline, addHandler, attach, channelReplacements, children, componentPath, componentVertex, detach, fire, initComponentsHandlers, iterator, name, newEventPipeline, newEventPipeline, parent, registerAsGenerator, root, toString, unregisterAsGenerator

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.jgrapes.core.Manager

stream

Field Details

mapper

protected static final com.fasterxml.jackson.databind.ObjectMapper mapper

The mapper.

Constructor Details

KVStoreBasedConsolePolicy

public KVStoreBasedConsolePolicy()

Creates a new component with its channel set to itself.

KVStoreBasedConsolePolicy

public KVStoreBasedConsolePolicy(Channel componentChannel)

Creates a new component with its channel set to the given channel.

Parameters:

componentChannel -

Method Details

onConsolePrepared

@Handler
public void onConsolePrepared(ConsolePrepared event,
 ConsoleConnection channel)

Create browser session scoped storage and forward event to it.

Parameters:

event - the event

channel - the channel

onConsoleLayoutChanged

@Handler
public void onConsoleLayoutChanged(ConsoleLayoutChanged event,
 ConsoleConnection channel)
                            throws IOException

Forward layout changed event to browser session scoped storage.

Parameters:

event - the event

channel - the channel

Throws:

IOException - Signals that an I/O exception has occurred.