Class AtomicActionRenderer<T>

A middleware to make action render events to satisfy transactions' atomicity.

Decorates an IActionRenderer<T> instance and filters out render events made by unsuccessful transactions (i.e., transactions with one or more exception-throwing actions).

Inheritance

Object

AtomicActionRenderer<T>

Implements

IActionRenderer<T>

IRenderer<T>

Namespace: Libplanet.Blockchain.Renderers

Assembly: Libplanet.dll

Syntax

public sealed class AtomicActionRenderer<T> : object, IActionRenderer<T>, IRenderer<T> where T : IAction, new()

Type Parameters

Name	Description
T	An IAction type. It should match to BlockChain<T>'s type parameter.

Remarks

The wrapped ActionRenderer will not receive any RenderActionError(IAction, IActionContext, Exception) and UnrenderActionError(IAction, IActionContext, Exception) events except for block actions, which do not belong to any transactions.

Constructors

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AtomicActionRenderer(IActionRenderer<T>)

Creates a new AtomicActionRenderer<T> instance decorating the given actionRenderer.

Declaration

public AtomicActionRenderer(IActionRenderer<T> actionRenderer)

Parameters

Type	Name	Description
IActionRenderer<T>	actionRenderer	The inner action renderer which has the actual implementations and expects to receive no RenderActionError(IAction, IActionContext, Exception)/UnrenderActionError(IAction, IActionContext, Exception) events.

Properties

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ActionRenderer

The inner action renderer which has the actual implementations and expects to receive no RenderActionError(IAction, IActionContext, Exception)/UnrenderActionError(IAction, IActionContext, Exception) events.

Declaration

public IActionRenderer<T> ActionRenderer { get; }

Property Value

Type	Description
IActionRenderer<T>

Methods

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RenderAction(IAction, IActionContext, IAccountStateDelta)

Does things that should be done right after an action is executed and applied to the blockchain.

Declaration

public void RenderAction(IAction action, IActionContext context, IAccountStateDelta nextStates)

Parameters

Type	Name	Description
IAction	action	An executed action.
IActionContext	context	The equivalent context object to an object passed to the `action`'s Execute(IActionContext) method. That means PreviousStates are the states right before this action executed. For the states after this action executed, use the `nextStates` argument instead.
IAccountStateDelta	nextStates	The states right after this action executed, which means it is equivalent to the states `action`'s Execute(IActionContext) method returned.

Remarks

It is guaranteed to be called only once for an action, and only after applied to the blockchain, unless an exception is thrown during executing the action (in that case RenderActionError(IAction, IActionContext, Exception) is called instead) or once the action has been unrendered.

Also note that this method is invoked after RenderBlock(Block<T>, Block<T>) method is called (where its second parameter newTip contains a transaction the action belongs to).

The reason why the parameter action takes IAction instead of T is because it can take block actions (BlockAction) besides transaction actions (Actions).

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RenderActionError(IAction, IActionContext, Exception)

Does the similar things to RenderAction(IAction, IActionContext, IAccountStateDelta), except that this method is invoked when action has terminated with an exception.

Declaration

public void RenderActionError(IAction action, IActionContext context, Exception exception)

Parameters

Type	Name	Description
IAction	action	An action which threw an exception during execution.
IActionContext	context	The equivalent context object to an object passed to the `action`'s Execute(IActionContext) method. That means PreviousStates are the states right before this action executed.
Exception	exception	The exception thrown during executing the `action`.

Remarks

Also note that this method is invoked after RenderBlock(Block<T>, Block<T>) method is called (where its second parameter newTip contains a transaction the action belongs to).

The reason why the parameter action takes IAction instead of T is because it can take block actions (BlockAction) besides transaction actions (Actions).

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RenderBlock(Block<T>, Block<T>)

Does things that should be done right after a new Block<T> is appended to a BlockChain<T> (so that its Tip has changed).

Declaration

public void RenderBlock(Block<T> oldTip, Block<T> newTip)

Parameters

Type	Name	Description
Block<T>	oldTip	The previous Tip.
Block<T>	newTip	The current Tip.

Remarks

It is guaranteed to be called only once for a block, and only after applied to the blockchain, unless it has been stale due to reorg (for that case, RenderReorg(Block<T>, Block<T>, Block<T>) is called in advance).

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RenderBlockEnd(Block<T>, Block<T>)

Does things that should be done right all actions in a new Block<T> are rendered.

Declaration

public void RenderBlockEnd(Block<T> oldTip, Block<T> newTip)

Parameters

Type	Name	Description
Block<T>	oldTip	The previous Tip.
Block<T>	newTip	The current Tip.

Remarks

It is guaranteed to be called only once for a block.

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RenderReorg(Block<T>, Block<T>, Block<T>)

Does things that should be done right before reorg happens to a BlockChain<T>.

Declaration

public void RenderReorg(Block<T> oldTip, Block<T> newTip, Block<T> branchpoint)

Parameters

Type	Name	Description
Block<T>	oldTip	The Tip right before reorg.
Block<T>	newTip	The Tip after reorg.
Block<T>	branchpoint	The highest common Block<T> between `oldTip` and `newTip`.

Remarks

For every call to this method, calls to RenderBlock(Block<T>, Block<T>) and RenderReorgEnd(Block<T>, Block<T>, Block<T>) methods with the same newTip is made too. Note that this method is guaranteed to be called before RenderBlock(Block<T>, Block<T>) method for the same newTip.

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RenderReorgEnd(Block<T>, Block<T>, Block<T>)

Does things that should be done right after reorg happens to a BlockChain<T>.

Declaration

public void RenderReorgEnd(Block<T> oldTip, Block<T> newTip, Block<T> branchpoint)

Parameters

Type	Name	Description
Block<T>	oldTip	The Tip right before reorg.
Block<T>	newTip	The Tip after reorg.
Block<T>	branchpoint	The highest common Block<T> between `oldTip` and `newTip`.

Remarks

Note that this method is guaranteed to be called after RenderReorg(Block<T>, Block<T>, Block<T>) and RenderBlock(Block<T>, Block<T>) methods for the same newTip.

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UnrenderAction(IAction, IActionContext, IAccountStateDelta)

Does things that should be undone right after the given action is invalidated (mostly due to reorg, i.e., a block which the action has belonged to becomes considered stale).

This method takes the equivalent arguments to RenderAction(IAction, IActionContext, IAccountStateDelta) method.

Declaration

public void UnrenderAction(IAction action, IActionContext context, IAccountStateDelta nextStates)

Parameters

Type	Name	Description
IAction	action	A stale action.
IActionContext	context	The equivalent context object to an object passed to the `action`'s Execute(IActionContext) method. That means PreviousStates are the states right before this action executed. For the states after this action executed, use the `nextStates` argument instead.
IAccountStateDelta	nextStates	The states right after this action executed, which means it is equivalent to the states `action`'s Execute(IActionContext) method returned.

Remarks

As a rule of thumb, this should be the inverse of RenderAction(IAction, IActionContext, IAccountStateDelta) method with redrawing the graphics on the display at the finish.

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UnrenderActionError(IAction, IActionContext, Exception)

Does the similar things to UnrenderAction(IAction, IActionContext, IAccountStateDelta), except that this method is invoked when action has terminated with an exception.

This method takes the equivalent arguments to RenderActionError(IAction, IActionContext, Exception) method.

Declaration

public void UnrenderActionError(IAction action, IActionContext context, Exception exception)

Parameters

Type	Name	Description
IAction	action	An action which threw an exception during execution.
IActionContext	context	The equivalent context object to an object passed to the `action`'s Execute(IActionContext) method. That means PreviousStates are the states right before this action executed.
Exception	exception	The exception thrown during executing the `action`.

Remarks

The reason why the parameter action takes IAction instead of T is because it can take block actions (BlockAction) besides transaction actions (Actions).

Implements

IActionRenderer<T>

IRenderer<T>