Class HandlerMonitor

java.lang.Object

io.fluxzero.sdk.tracking.metrics.HandlerMonitor

All Implemented Interfaces:

HandlerDecorator, HandlerInterceptor

public class HandlerMonitor
extends Object
implements HandlerInterceptor

Nested Class Summary

Nested classes/interfaces inherited from interface HandlerDecorator

HandlerDecorator.MergedDecorator

Nested classes/interfaces inherited from interface HandlerInterceptor

HandlerInterceptor.InterceptedHandler, HandlerInterceptor.PreparedHandlerFunction, HandlerInterceptor.PreparedHandlerInputFunction, HandlerInterceptor.PreparedHandlerInputInterceptor, HandlerInterceptor.PreparedHandlerInterceptor, HandlerInterceptor.PreparedInterceptedHandler

Field Summary

Fields inherited from interface HandlerDecorator

noOp

Fields inherited from interface HandlerInterceptor

defaultInterceptors

Constructor Summary

Constructors

Constructor	Description
HandlerMonitor()

Method Summary

Modifier and Type	Method	Description
protected String	formatType(DeserializingMessage message, HandlerInvoker invoker)
Function<DeserializingMessage, Object>	interceptHandling(Function<DeserializingMessage, Object> function, HandlerInvoker invoker)	Intercepts the message handling logic.
protected boolean	logMetrics(HandlerInvoker invoker, HasMessage message)
protected boolean	metricsDisabled(HandlerInvoker invoker)
HandlerInterceptor.PreparedHandlerInterceptor	prepare(HandlerDescriptor handler)	Prepares this interceptor for a specific handler method.
HandlerInterceptor.PreparedHandlerInputInterceptor	prepareInput(HandlerDescriptor handler)	Prepares this interceptor to run without first creating a complete message.
HandlerInterceptor.PreparedHandlerInputInterceptor	prepareInput(HandlerDescriptor handler, HandlerInput<DeserializingMessage> input)	Prepares this interceptor using both the selected handler method and a representative input.
protected void	publishMetrics(HandlerInvoker invoker, DeserializingMessage message, boolean exceptionalResult, Instant start, Object result)
boolean	supportsPreparation()	Indicates whether this interceptor opts into the prepared, mergeable handler wrapper.

Methods inherited from class Object

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

Methods inherited from interface HandlerDecorator

andThen

Methods inherited from interface HandlerInterceptor

wrap

Constructor Details

HandlerMonitor

public HandlerMonitor()

Method Details

interceptHandling

public Function<DeserializingMessage, Object> interceptHandling(Function<DeserializingMessage, Object> function,
 HandlerInvoker invoker)

Description copied from interface: HandlerInterceptor

Intercepts the message handling logic.

The function parameter represents the next step in the handling chain— typically the actual message handler. The invoker provides metadata and invocation logic for the underlying handler method.

Within this method, an interceptor may:

• Modify the DeserializingMessage before passing it to the handler
• Bypass the handler entirely and return a value directly
• Wrap the result after the handler is invoked

Note: Interceptors may return a different DeserializingMessage, but it must be compatible with a handler method in the same target class. If no suitable handler is found, an exception will be thrown.

Specified by:

interceptHandling in interface HandlerInterceptor

Parameters:

function - the next step in the handler chain (typically the handler itself)

invoker - the metadata and execution strategy for the actual handler method

Returns:

a decorated function that wraps handling behavior

prepare

public HandlerInterceptor.PreparedHandlerInterceptor prepare(HandlerDescriptor handler)

Description copied from interface: HandlerInterceptor

Prepares this interceptor for a specific handler method.

The returned interceptor is cached and reused concurrently for invocations with the same stable handler metadata. Implementations may use this hook to resolve annotation- or signature-based policy once while keeping message-dependent decisions inside HandlerInterceptor.PreparedHandlerInterceptor.interceptHandling(DeserializingMessage, HandlerDescriptor, BiFunction, HandlerInterceptor.PreparedHandlerFunction).

The default adapter preserves the existing HandlerInterceptor.interceptHandling(Function, HandlerInvoker) contract and deliberately disables the reusable HandlerMethod path. Custom interceptors therefore retain their current behavior unless they explicitly opt into preparation.

Specified by:

prepare in interface HandlerInterceptor

Parameters:

handler - stable metadata for the handler method

Returns:

a thread-safe prepared interceptor

prepareInput

public HandlerInterceptor.PreparedHandlerInputInterceptor prepareInput(HandlerDescriptor handler)

Description copied from interface: HandlerInterceptor

Prepares this interceptor to run without first creating a complete message.

Return null when the interceptor requires the regular message-based handling path. The default only supports an interceptor whose prepared behavior is the shared no-op policy, so existing interceptors retain their exact behavior unless they opt in explicitly.

The returned policy may be cached and invoked concurrently.

Specified by:

prepareInput in interface HandlerInterceptor

Parameters:

handler - stable information about the selected handler method

Returns:

a thread-safe payload-first policy, or null to use regular message-based handling

prepareInput

public HandlerInterceptor.PreparedHandlerInputInterceptor prepareInput(HandlerDescriptor handler,
 HandlerInput<DeserializingMessage> input)

Description copied from interface: HandlerInterceptor

Prepares this interceptor using both the selected handler method and a representative input.

Override this overload when the interceptor's ability to use payload-first handling depends on input characteristics. The default delegates to HandlerInterceptor.prepareInput(HandlerDescriptor).

Specified by:

prepareInput in interface HandlerInterceptor

Parameters:

handler - stable information about the selected handler method

input - a representative input for the prepared handler plan

Returns:

a thread-safe payload-first policy, or null to use regular message-based handling

supportsPreparation

public boolean supportsPreparation()

Description copied from interface: HandlerInterceptor

Indicates whether this interceptor opts into the prepared, mergeable handler wrapper.

The default is false, preserving the exact wrapper behavior of existing custom interceptors. An interceptor should return true only when HandlerInterceptor.prepare(HandlerDescriptor) returns a thread-safe plan that fully represents its handling behavior. If a subclass overrides only the legacy HandlerInterceptor.interceptHandling(Function, HandlerInvoker) method, the legacy wrapper is retained automatically.

Specified by:

supportsPreparation in interface HandlerInterceptor

Returns:

true when this interceptor may be merged into a prepared wrapper

publishMetrics

protected void publishMetrics(HandlerInvoker invoker,
 DeserializingMessage message,
 boolean exceptionalResult,
 Instant start,
 Object result)

formatType

protected String formatType(DeserializingMessage message,
 HandlerInvoker invoker)

metricsDisabled

protected boolean metricsDisabled(HandlerInvoker invoker)

logMetrics

protected boolean logMetrics(HandlerInvoker invoker,
 HasMessage message)