Package org.apache.tapestry5.services
Interface Heartbeat
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- All Known Implementing Classes:
HeartbeatImpl
public interface Heartbeat
Allows for deferred execution of logic, useful when trying to get multiple components to coordinate behavior. A component may add a command to be executed "at the end of the heartbeat". The classic example of this is a Label and the field it labels; since we don't know which order the two will render, we can't tell if the field's id is correct until after both have rendered. The Heartbeat is injected into components via theEnvironmentalannotation.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description voidbegin()Begins a new Heartbeat.voiddefer(java.lang.Runnable command)Adds a new command to the current Heartbeat.voidend()Executes all commands since the most recentbegin().
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Method Detail
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begin
void begin()
Begins a new Heartbeat. Heartbeats nest. Every call to begin() should be matched by a call toend().
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defer
void defer(java.lang.Runnable command)
Adds a new command to the current Heartbeat. The command will be executed byend().- Parameters:
command- command to be executed at the end of the heartbeat- See Also:
HeartbeatDeferred
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