Package io.vertx.reactivex.circuitbreaker

Class CircuitBreaker

java.lang.Object

io.vertx.reactivex.circuitbreaker.CircuitBreaker

public class CircuitBreaker
extends Object

An implementation of the circuit breaker pattern for Vert.x

NOTE: This class has been automatically generated from the original non RX-ified interface using Vert.x codegen.

Field Summary

Fields

Modifier and Type	Field	Description
static TypeArg<CircuitBreaker>	__TYPE_ARG

Constructor Summary

Constructors

Constructor	Description
CircuitBreaker(CircuitBreaker delegate)
CircuitBreaker(Object delegate)

Method Summary

Modifier and Type	Method	Description
CircuitBreaker	close()	Closes the circuit breaker.
CircuitBreaker	closeHandler(Handler<Void> handler)	Sets a invoked when the circuit breaker state switches to close.
static CircuitBreaker	create(String name, Vertx vertx)	Creates a new instance of CircuitBreaker, with default options.
static CircuitBreaker	create(String name, Vertx vertx, CircuitBreakerOptions options)	Creates a new instance of CircuitBreaker.
boolean	equals(Object o)
<T> void	execute(Handler<Promise<T>> command)	Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using the circuit breaker default fallback.
<T> void	execute(Handler<Promise<T>> command, Handler<AsyncResult<T>> handler)	Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using the circuit breaker default fallback.
<T> CircuitBreaker	executeAndReport(Promise<T> resultPromise, Handler<Promise<T>> command)	Same as executeAndReportWithFallback(io.vertx.reactivex.core.Promise<T>, io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>) but using the circuit breaker default fallback.
<T> CircuitBreaker	executeAndReportWithFallback(Promise<T> resultPromise, Handler<Promise<T>> command, Function<Throwable,T> fallback)	Executes the given operation with the circuit breaker control.
<T> void	executeWithFallback(Handler<Promise<T>> command, Function<Throwable,T> fallback)	Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using a callback.
<T> void	executeWithFallback(Handler<Promise<T>> command, Function<Throwable,T> fallback, Handler<AsyncResult<T>> handler)	Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using a callback.
long	failureCount()
<T> CircuitBreaker	fallback(Function<Throwable,T> handler)	Sets a default invoked when the bridge is open to handle the "request", or on failure if CircuitBreakerOptions is enabled.
CircuitBreaker	getDelegate()
CircuitBreaker	halfOpenHandler(Handler<Void> handler)	Sets a invoked when the circuit breaker state switches to half-open.
int	hashCode()
String	name()
static CircuitBreaker	newInstance(CircuitBreaker arg)
CircuitBreaker	open()	Explicitly opens the circuit.
CircuitBreaker	openHandler(Handler<Void> handler)	Sets a invoked when the circuit breaker state switches to open.
CircuitBreaker	reset()	Resets the circuit breaker state (number of failure set to 0 and state set to closed).
CircuitBreaker	retryPolicy(RetryPolicy retryPolicy)	Set a RetryPolicy which computes a delay before retry execution.
CircuitBreaker	retryPolicy(Function<Integer,Long> retryPolicy)	Deprecated.
<T> io.reactivex.Single<T>	rxExecute(Handler<Promise<T>> command)	Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using the circuit breaker default fallback.
<T> io.reactivex.Single<T>	rxExecuteWithFallback(Handler<Promise<T>> command, Function<Throwable,T> fallback)	Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using a callback.
CircuitBreakerState	state()
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

__TYPE_ARG

public static final TypeArg<CircuitBreaker> __TYPE_ARG

Constructor Detail

CircuitBreaker

public CircuitBreaker(CircuitBreaker delegate)

CircuitBreaker

public CircuitBreaker(Object delegate)

Method Detail

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getDelegate

public CircuitBreaker getDelegate()

create

public static CircuitBreaker create(String name,
                                    Vertx vertx,
                                    CircuitBreakerOptions options)

Creates a new instance of CircuitBreaker.

Parameters:

name - the name

vertx - the Vert.x instance

options - the configuration option

Returns:

the created instance

create

public static CircuitBreaker create(String name,
                                    Vertx vertx)

Creates a new instance of CircuitBreaker, with default options.

Parameters:

name - the name

vertx - the Vert.x instance

Returns:

the created instance

close

public CircuitBreaker close()

Closes the circuit breaker. It stops sending events on its state on the event bus. This method is not related to the close state of the circuit breaker. To set the circuit breaker in the close state, use reset().

Returns:

openHandler

public CircuitBreaker openHandler(Handler<Void> handler)

Sets a invoked when the circuit breaker state switches to open.

Parameters:

handler - the handler, must not be null

Returns:

the current CircuitBreaker

halfOpenHandler

public CircuitBreaker halfOpenHandler(Handler<Void> handler)

Sets a invoked when the circuit breaker state switches to half-open.

Parameters:

handler - the handler, must not be null

Returns:

the current CircuitBreaker

closeHandler

public CircuitBreaker closeHandler(Handler<Void> handler)

Sets a invoked when the circuit breaker state switches to close.

Parameters:

handler - the handler, must not be null

Returns:

the current CircuitBreaker

executeWithFallback

public <T> void executeWithFallback(Handler<Promise<T>> command,
                                    Function<Throwable,T> fallback,
                                    Handler<AsyncResult<T>> handler)

Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using a callback.

Parameters:

command - the operation

fallback - the fallback

handler - the completion handler receiving either the operation result or the fallback result. The parameter is an because if the fallback is not called, the error is passed to the handler.

executeWithFallback

public <T> void executeWithFallback(Handler<Promise<T>> command,
                                    Function<Throwable,T> fallback)

Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using a callback.

Parameters:

command - the operation

fallback - the fallback

rxExecuteWithFallback

public <T> io.reactivex.Single<T> rxExecuteWithFallback(Handler<Promise<T>> command,
                                                        Function<Throwable,T> fallback)

Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using a callback.

Parameters:

command - the operation

fallback - the fallback

Returns:

execute

public <T> void execute(Handler<Promise<T>> command,
                        Handler<AsyncResult<T>> handler)

Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using the circuit breaker default fallback.

Parameters:

command - the operation

handler - the completion handler receiving either the operation result or the fallback result. The parameter is an because if the fallback is not called, the error is passed to the handler.

execute

public <T> void execute(Handler<Promise<T>> command)

Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using the circuit breaker default fallback.

Parameters:

command - the operation

rxExecute

public <T> io.reactivex.Single<T> rxExecute(Handler<Promise<T>> command)

Same as executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>) but using the circuit breaker default fallback.

Parameters:

command - the operation

Returns:

executeAndReport

public <T> CircuitBreaker executeAndReport(Promise<T> resultPromise,
                                           Handler<Promise<T>> command)

Same as executeAndReportWithFallback(io.vertx.reactivex.core.Promise<T>, io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>) but using the circuit breaker default fallback.

Parameters:

resultPromise - the promise on which the operation result is reported

command - the operation

Returns:

the current CircuitBreaker

executeAndReportWithFallback

public <T> CircuitBreaker executeAndReportWithFallback(Promise<T> resultPromise,
                                                       Handler<Promise<T>> command,
                                                       Function<Throwable,T> fallback)

Executes the given operation with the circuit breaker control. The operation is generally calling an external system. The operation receives a object as parameter and must call when the operation has terminated successfully. The operation must also call in case of failure.

The operation is not invoked if the circuit breaker is open, and the given fallback is called immediately. The circuit breaker also monitor the completion of the operation before a configure timeout. The operation is considered as failed if it does not terminate in time.

Unlike executeWithFallback(io.vertx.core.Handler<io.vertx.reactivex.core.Promise<T>>, java.util.function.Function<java.lang.Throwable, T>, io.vertx.core.Handler<io.vertx.core.AsyncResult<T>>), this method does return a object, but let the caller pass a object on which the result is reported. If the fallback is called, the future is successfully completed with the value returned by the fallback function. If the fallback throws an exception, the future is marked as failed.

Parameters:

resultPromise - the promise on which the operation result is reported

command - the operation

fallback - the fallback function. It gets an exception as parameter and returns the fallback result

Returns:

the current CircuitBreaker

fallback

public <T> CircuitBreaker fallback(Function<Throwable,T> handler)

Sets a default invoked when the bridge is open to handle the "request", or on failure if CircuitBreakerOptions is enabled.

The function gets the exception as parameter and returns the fallback result.

Parameters:

handler - the handler

Returns:

the current CircuitBreaker

reset

public CircuitBreaker reset()

Resets the circuit breaker state (number of failure set to 0 and state set to closed).

Returns:

the current CircuitBreaker

open

public CircuitBreaker open()

Explicitly opens the circuit.

Returns:

the current CircuitBreaker

state

public CircuitBreakerState state()

Returns:

the current state.

failureCount

public long failureCount()

Returns:

the current number of failures.

name

public String name()

Returns:

the name of the circuit breaker.

retryPolicy

@Deprecated
public CircuitBreaker retryPolicy(Function<Integer,Long> retryPolicy)

Deprecated.

Parameters:

retryPolicy -

Returns:

retryPolicy

public CircuitBreaker retryPolicy(RetryPolicy retryPolicy)

Set a RetryPolicy which computes a delay before retry execution.

Parameters:

retryPolicy -

Returns:

newInstance

public static CircuitBreaker newInstance(CircuitBreaker arg)