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io.smallrye.faulttolerance.FaultToleranceInterceptor Maven / Gradle / Ivy
/*
* Copyright 2017 Red Hat, Inc, and individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.smallrye.faulttolerance;
import static io.smallrye.faulttolerance.core.Invocation.invocation;
import static io.smallrye.faulttolerance.core.util.SneakyThrow.sneakyThrow;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.Duration;
import java.time.temporal.ChronoUnit;
import java.util.Arrays;
import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.concurrent.CompletionStage;
import java.util.concurrent.Executor;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Future;
import java.util.function.Supplier;
import jakarta.annotation.Priority;
import jakarta.enterprise.context.control.RequestContextController;
import jakarta.enterprise.inject.Any;
import jakarta.enterprise.inject.Instance;
import jakarta.enterprise.inject.Intercepted;
import jakarta.enterprise.inject.spi.Bean;
import jakarta.inject.Inject;
import jakarta.interceptor.AroundInvoke;
import jakarta.interceptor.Interceptor;
import jakarta.interceptor.InvocationContext;
import org.eclipse.microprofile.faulttolerance.FallbackHandler;
import org.eclipse.microprofile.faulttolerance.exceptions.FaultToleranceException;
import io.smallrye.common.annotation.Identifier;
import io.smallrye.faulttolerance.api.CustomBackoffStrategy;
import io.smallrye.faulttolerance.api.FaultTolerance;
import io.smallrye.faulttolerance.config.FaultToleranceOperation;
import io.smallrye.faulttolerance.core.FaultToleranceStrategy;
import io.smallrye.faulttolerance.core.apiimpl.LazyFaultTolerance;
import io.smallrye.faulttolerance.core.async.CompletionStageExecution;
import io.smallrye.faulttolerance.core.async.FutureExecution;
import io.smallrye.faulttolerance.core.async.RememberEventLoop;
import io.smallrye.faulttolerance.core.bulkhead.CompletionStageThreadPoolBulkhead;
import io.smallrye.faulttolerance.core.bulkhead.FutureThreadPoolBulkhead;
import io.smallrye.faulttolerance.core.bulkhead.SemaphoreBulkhead;
import io.smallrye.faulttolerance.core.circuit.breaker.CircuitBreaker;
import io.smallrye.faulttolerance.core.circuit.breaker.CircuitBreakerEvents;
import io.smallrye.faulttolerance.core.circuit.breaker.CompletionStageCircuitBreaker;
import io.smallrye.faulttolerance.core.event.loop.EventLoop;
import io.smallrye.faulttolerance.core.fallback.AsyncFallbackFunction;
import io.smallrye.faulttolerance.core.fallback.CompletionStageFallback;
import io.smallrye.faulttolerance.core.fallback.Fallback;
import io.smallrye.faulttolerance.core.fallback.FallbackFunction;
import io.smallrye.faulttolerance.core.invocation.AsyncSupport;
import io.smallrye.faulttolerance.core.invocation.AsyncSupportRegistry;
import io.smallrye.faulttolerance.core.invocation.Invoker;
import io.smallrye.faulttolerance.core.invocation.StrategyInvoker;
import io.smallrye.faulttolerance.core.metrics.CompletionStageMetricsCollector;
import io.smallrye.faulttolerance.core.metrics.MetricsCollector;
import io.smallrye.faulttolerance.core.metrics.MetricsRecorder;
import io.smallrye.faulttolerance.core.rate.limit.CompletionStageRateLimit;
import io.smallrye.faulttolerance.core.rate.limit.RateLimit;
import io.smallrye.faulttolerance.core.retry.BackOff;
import io.smallrye.faulttolerance.core.retry.CompletionStageRetry;
import io.smallrye.faulttolerance.core.retry.ConstantBackOff;
import io.smallrye.faulttolerance.core.retry.CustomBackOff;
import io.smallrye.faulttolerance.core.retry.ExponentialBackOff;
import io.smallrye.faulttolerance.core.retry.FibonacciBackOff;
import io.smallrye.faulttolerance.core.retry.Jitter;
import io.smallrye.faulttolerance.core.retry.RandomJitter;
import io.smallrye.faulttolerance.core.retry.Retry;
import io.smallrye.faulttolerance.core.retry.ThreadSleepDelay;
import io.smallrye.faulttolerance.core.retry.TimerDelay;
import io.smallrye.faulttolerance.core.stopwatch.SystemStopwatch;
import io.smallrye.faulttolerance.core.timeout.AsyncTimeout;
import io.smallrye.faulttolerance.core.timeout.CompletionStageTimeout;
import io.smallrye.faulttolerance.core.timeout.Timeout;
import io.smallrye.faulttolerance.core.timeout.TimerTimeoutWatcher;
import io.smallrye.faulttolerance.core.timer.Timer;
import io.smallrye.faulttolerance.core.util.DirectExecutor;
import io.smallrye.faulttolerance.core.util.ExceptionDecision;
import io.smallrye.faulttolerance.core.util.SetBasedExceptionDecision;
import io.smallrye.faulttolerance.core.util.SetOfThrowables;
import io.smallrye.faulttolerance.internal.FallbackMethod;
import io.smallrye.faulttolerance.internal.FallbackMethodCandidates;
import io.smallrye.faulttolerance.internal.InterceptionInvoker;
import io.smallrye.faulttolerance.internal.InterceptionPoint;
import io.smallrye.faulttolerance.internal.RequestScopeActivator;
import io.smallrye.faulttolerance.internal.StrategyCache;
import io.smallrye.faulttolerance.metrics.MetricsProvider;
/**
* The interceptor for fault tolerance strategies.
*
* @author Antoine Sabot-Durand
* @author Martin Kouba
* @author Michal Szynkiewicz
*/
@Interceptor
@FaultToleranceBinding
@Priority(Interceptor.Priority.PLATFORM_AFTER + 10)
public class FaultToleranceInterceptor {
private final Bean interceptedBean;
private final FaultToleranceOperationProvider operationProvider;
private final StrategyCache cache;
private final FallbackHandlerProvider fallbackHandlerProvider;
private final MetricsProvider metricsProvider;
private final ExecutorService asyncExecutor;
private final EventLoop eventLoop;
private final Timer timer;
private final RequestContextController requestContextController;
private final CircuitBreakerMaintenanceImpl cbMaintenance;
private final SpecCompatibility specCompatibility;
private final Instance> configuredFaultTolerance;
@Inject
public FaultToleranceInterceptor(
@Intercepted Bean interceptedBean,
FaultToleranceOperationProvider operationProvider,
StrategyCache cache,
FallbackHandlerProvider fallbackHandlerProvider,
MetricsProvider metricsProvider,
ExecutorHolder executorHolder,
RequestContextIntegration requestContextIntegration,
CircuitBreakerMaintenanceImpl cbMaintenance,
SpecCompatibility specCompatibility,
@Any Instance> configuredFaultTolerance) {
this.interceptedBean = interceptedBean;
this.operationProvider = operationProvider;
this.cache = cache;
this.fallbackHandlerProvider = fallbackHandlerProvider;
this.metricsProvider = metricsProvider;
asyncExecutor = executorHolder.getAsyncExecutor();
eventLoop = executorHolder.getEventLoop();
timer = executorHolder.getTimer();
requestContextController = requestContextIntegration.get();
this.cbMaintenance = cbMaintenance;
this.specCompatibility = specCompatibility;
this.configuredFaultTolerance = configuredFaultTolerance;
}
@AroundInvoke
public Object intercept(InvocationContext interceptionContext) throws Exception {
Method method = interceptionContext.getMethod();
Class beanClass = interceptedBean != null ? interceptedBean.getBeanClass() : method.getDeclaringClass();
InterceptionPoint point = new InterceptionPoint(beanClass, interceptionContext.getMethod());
FaultToleranceOperation operation = operationProvider.get(beanClass, method);
if (operation.hasApplyFaultTolerance()) {
return preconfiguredFlow(operation, interceptionContext);
} else if (specCompatibility.isOperationTrulyAsynchronous(operation)) {
return asyncFlow(operation, interceptionContext, point);
} else if (specCompatibility.isOperationPseudoAsynchronous(operation)) {
return futureFlow(operation, interceptionContext, point);
} else {
return syncFlow(operation, interceptionContext, point);
}
}
private Object preconfiguredFlow(FaultToleranceOperation operation, InvocationContext interceptionContext)
throws Exception {
String identifier = operation.getApplyFaultTolerance().value();
Instance> instance = configuredFaultTolerance.select(Identifier.Literal.of(identifier));
if (!instance.isResolvable()) {
throw new FaultToleranceException("Can't resolve a bean of type " + FaultTolerance.class.getName()
+ " with qualifier @" + Identifier.class.getName() + "(\"" + identifier + "\")");
}
FaultTolerance faultTolerance = (FaultTolerance) instance.get();
if (!(faultTolerance instanceof LazyFaultTolerance)) {
throw new FaultToleranceException("Configured fault tolerance '" + identifier
+ "' is not created by the FaultTolerance API, this is not supported");
}
Class asyncType = ((LazyFaultTolerance) faultTolerance).internalGetAsyncType();
AsyncSupport forOperation = AsyncSupportRegistry.get(operation.getParameterTypes(), operation.getReturnType());
AsyncSupport fromConfigured = asyncType == null ? null : AsyncSupportRegistry.get(new Class[0], asyncType);
if (forOperation == null && fromConfigured == null) {
return faultTolerance.call(interceptionContext::proceed);
} else if (forOperation == null) {
throw new FaultToleranceException("Configured fault tolerance '" + identifier
+ "' expects the operation to " + fromConfigured.mustDescription()
+ ", but the operation is synchronous: " + operation);
} else if (fromConfigured == null) {
throw new FaultToleranceException("Configured fault tolerance '" + identifier
+ "' expects the operation to be synchronous, but it "
+ forOperation.doesDescription() + ": " + operation);
} else if (!forOperation.getClass().equals(fromConfigured.getClass())) {
throw new FaultToleranceException("Configured fault tolerance '" + identifier
+ "' expects the operation to " + fromConfigured.mustDescription()
+ ", but it " + forOperation.doesDescription() + ": " + operation);
} else {
return faultTolerance.call(interceptionContext::proceed);
}
}
private AT asyncFlow(FaultToleranceOperation operation, InvocationContext interceptionContext,
InterceptionPoint point) {
AsyncSupport asyncSupport = AsyncSupportRegistry.get(operation.getParameterTypes(), operation.getReturnType());
if (asyncSupport == null) {
throw new FaultToleranceException("Unknown async invocation: " + operation);
}
FaultToleranceStrategy> strategy = cache.getStrategy(point,
() -> prepareAsyncStrategy(operation, point));
Invoker invoker = new InterceptionInvoker<>(interceptionContext);
io.smallrye.faulttolerance.core.InvocationContext> ctx = invocationContext(
() -> asyncSupport.toCompletionStage(invoker), interceptionContext, operation);
Invoker> wrapper = new StrategyInvoker<>(interceptionContext.getParameters(),
strategy, ctx);
try {
return asyncSupport.fromCompletionStage(wrapper);
} catch (Exception e) {
throw sneakyThrow(e);
}
}
private T syncFlow(FaultToleranceOperation operation, InvocationContext interceptionContext, InterceptionPoint point)
throws Exception {
FaultToleranceStrategy strategy = cache.getStrategy(point, () -> prepareSyncStrategy(operation, point));
io.smallrye.faulttolerance.core.InvocationContext ctx = invocationContext(
() -> (T) interceptionContext.proceed(), interceptionContext, operation);
return strategy.apply(ctx);
}
private Future futureFlow(FaultToleranceOperation operation, InvocationContext interceptionContext,
InterceptionPoint point) throws Exception {
FaultToleranceStrategy> strategy = cache.getStrategy(point, () -> prepareFutureStrategy(operation, point));
io.smallrye.faulttolerance.core.InvocationContext> ctx = invocationContext(
() -> (Future) interceptionContext.proceed(), interceptionContext, operation);
return strategy.apply(ctx);
}
private io.smallrye.faulttolerance.core.InvocationContext invocationContext(Callable callable,
InvocationContext interceptionContext, FaultToleranceOperation operation) {
io.smallrye.faulttolerance.core.InvocationContext result = new io.smallrye.faulttolerance.core.InvocationContext<>(
callable);
result.set(InvocationContext.class, interceptionContext);
if (operation.hasCircuitBreaker() && operation.hasCircuitBreakerName()) {
result.registerEventHandler(CircuitBreakerEvents.StateTransition.class,
cbMaintenance.stateTransitionEventHandler(operation.getCircuitBreakerName().value()));
}
return result;
}
private FaultToleranceStrategy> prepareAsyncStrategy(FaultToleranceOperation operation,
InterceptionPoint point) {
FaultToleranceStrategy> result = invocation();
result = new RequestScopeActivator<>(result, requestContextController);
Executor executor = operation.isThreadOffloadRequired() ? asyncExecutor : DirectExecutor.INSTANCE;
result = new CompletionStageExecution<>(result, executor);
if (operation.hasBulkhead()) {
int size = operation.getBulkhead().value();
int queueSize = operation.getBulkhead().waitingTaskQueue();
result = new CompletionStageThreadPoolBulkhead<>(result, point.toString(), size, queueSize);
}
if (operation.hasTimeout()) {
long timeoutMs = getTimeInMs(operation.getTimeout().value(), operation.getTimeout().unit());
result = new CompletionStageTimeout<>(result, point.toString(), timeoutMs,
new TimerTimeoutWatcher(timer));
}
if (operation.hasRateLimit()) {
result = new CompletionStageRateLimit<>(result, point.toString(),
operation.getRateLimit().value(),
getTimeInMs(operation.getRateLimit().window(), operation.getRateLimit().windowUnit()),
getTimeInMs(operation.getRateLimit().minSpacing(), operation.getRateLimit().minSpacingUnit()),
operation.getRateLimit().type(),
SystemStopwatch.INSTANCE);
}
if (operation.hasCircuitBreaker()) {
long delayInMillis = getTimeInMs(operation.getCircuitBreaker().delay(), operation.getCircuitBreaker().delayUnit());
result = new CompletionStageCircuitBreaker<>(result, point.toString(),
createExceptionDecision(operation.getCircuitBreaker().skipOn(), operation.getCircuitBreaker().failOn()),
delayInMillis,
operation.getCircuitBreaker().requestVolumeThreshold(),
operation.getCircuitBreaker().failureRatio(),
operation.getCircuitBreaker().successThreshold(),
SystemStopwatch.INSTANCE,
timer);
String cbName = operation.hasCircuitBreakerName()
? operation.getCircuitBreakerName().value()
: UUID.randomUUID().toString();
cbMaintenance.register(cbName, (CircuitBreaker) result);
}
if (operation.hasRetry()) {
long maxDurationMs = getTimeInMs(operation.getRetry().maxDuration(), operation.getRetry().durationUnit());
Supplier backoff = prepareRetryBackoff(operation);
result = new CompletionStageRetry<>(result, point.toString(),
createExceptionDecision(operation.getRetry().abortOn(), operation.getRetry().retryOn()),
operation.getRetry().maxRetries(),
maxDurationMs,
() -> new TimerDelay(backoff.get(), timer),
SystemStopwatch.INSTANCE);
}
if (operation.hasFallback()) {
result = new CompletionStageFallback<>(result, point.toString(),
prepareFallbackFunction(point, operation),
createExceptionDecision(operation.getFallback().skipOn(), operation.getFallback().applyOn()));
}
if (metricsProvider.isEnabled()) {
result = new CompletionStageMetricsCollector<>(result, getMetricsRecorder(operation, point),
operation.hasBulkhead(), operation.hasCircuitBreaker(), operation.hasRateLimit(),
operation.hasRetry(), operation.hasTimeout());
}
if (!operation.isThreadOffloadRequired()) {
result = new RememberEventLoop<>(result, eventLoop);
}
return result;
}
private FaultToleranceStrategy prepareSyncStrategy(FaultToleranceOperation operation, InterceptionPoint point) {
FaultToleranceStrategy result = invocation();
if (operation.hasBulkhead()) {
result = new SemaphoreBulkhead<>(result, point.toString(), operation.getBulkhead().value());
}
if (operation.hasTimeout()) {
long timeoutMs = getTimeInMs(operation.getTimeout().value(), operation.getTimeout().unit());
result = new Timeout<>(result, point.toString(), timeoutMs,
new TimerTimeoutWatcher(timer));
}
if (operation.hasRateLimit()) {
result = new RateLimit<>(result, point.toString(),
operation.getRateLimit().value(),
getTimeInMs(operation.getRateLimit().window(), operation.getRateLimit().windowUnit()),
getTimeInMs(operation.getRateLimit().minSpacing(), operation.getRateLimit().minSpacingUnit()),
operation.getRateLimit().type(),
SystemStopwatch.INSTANCE);
}
if (operation.hasCircuitBreaker()) {
long delayInMillis = getTimeInMs(operation.getCircuitBreaker().delay(), operation.getCircuitBreaker().delayUnit());
result = new CircuitBreaker<>(result, point.toString(),
createExceptionDecision(operation.getCircuitBreaker().skipOn(), operation.getCircuitBreaker().failOn()),
delayInMillis,
operation.getCircuitBreaker().requestVolumeThreshold(),
operation.getCircuitBreaker().failureRatio(),
operation.getCircuitBreaker().successThreshold(),
SystemStopwatch.INSTANCE,
timer);
String cbName = operation.hasCircuitBreakerName()
? operation.getCircuitBreakerName().value()
: UUID.randomUUID().toString();
cbMaintenance.register(cbName, (CircuitBreaker) result);
}
if (operation.hasRetry()) {
long maxDurationMs = getTimeInMs(operation.getRetry().maxDuration(), operation.getRetry().durationUnit());
Supplier backoff = prepareRetryBackoff(operation);
result = new Retry<>(result, point.toString(),
createExceptionDecision(operation.getRetry().abortOn(), operation.getRetry().retryOn()),
operation.getRetry().maxRetries(),
maxDurationMs,
() -> new ThreadSleepDelay(backoff.get()),
SystemStopwatch.INSTANCE);
}
if (operation.hasFallback()) {
result = new Fallback<>(result, point.toString(),
prepareFallbackFunction(point, operation),
createExceptionDecision(operation.getFallback().skipOn(), operation.getFallback().applyOn()));
}
if (metricsProvider.isEnabled()) {
result = new MetricsCollector<>(result, getMetricsRecorder(operation, point), false,
operation.hasBulkhead(), operation.hasCircuitBreaker(), operation.hasRateLimit(),
operation.hasRetry(), operation.hasTimeout());
}
return result;
}
private FaultToleranceStrategy> prepareFutureStrategy(FaultToleranceOperation operation,
InterceptionPoint point) {
FaultToleranceStrategy> result = invocation();
result = new RequestScopeActivator<>(result, requestContextController);
if (operation.hasBulkhead()) {
int size = operation.getBulkhead().value();
int queueSize = operation.getBulkhead().waitingTaskQueue();
result = new FutureThreadPoolBulkhead<>(result, point.toString(), size, queueSize);
}
if (operation.hasTimeout()) {
long timeoutMs = getTimeInMs(operation.getTimeout().value(), operation.getTimeout().unit());
Timeout> timeout = new Timeout<>(result, point.toString(), timeoutMs,
new TimerTimeoutWatcher(timer));
result = new AsyncTimeout<>(timeout, asyncExecutor);
}
if (operation.hasRateLimit()) {
result = new RateLimit<>(result, point.toString(),
operation.getRateLimit().value(),
getTimeInMs(operation.getRateLimit().window(), operation.getRateLimit().windowUnit()),
getTimeInMs(operation.getRateLimit().minSpacing(), operation.getRateLimit().minSpacingUnit()),
operation.getRateLimit().type(),
SystemStopwatch.INSTANCE);
}
if (operation.hasCircuitBreaker()) {
long delayInMillis = getTimeInMs(operation.getCircuitBreaker().delay(), operation.getCircuitBreaker().delayUnit());
result = new CircuitBreaker<>(result, point.toString(),
createExceptionDecision(operation.getCircuitBreaker().skipOn(), operation.getCircuitBreaker().failOn()),
delayInMillis,
operation.getCircuitBreaker().requestVolumeThreshold(),
operation.getCircuitBreaker().failureRatio(),
operation.getCircuitBreaker().successThreshold(),
SystemStopwatch.INSTANCE,
timer);
String cbName = operation.hasCircuitBreakerName()
? operation.getCircuitBreakerName().value()
: UUID.randomUUID().toString();
cbMaintenance.register(cbName, (CircuitBreaker) result);
}
if (operation.hasRetry()) {
long maxDurationMs = getTimeInMs(operation.getRetry().maxDuration(), operation.getRetry().durationUnit());
Supplier backoff = prepareRetryBackoff(operation);
result = new Retry<>(result, point.toString(),
createExceptionDecision(operation.getRetry().abortOn(), operation.getRetry().retryOn()),
operation.getRetry().maxRetries(),
maxDurationMs,
() -> new ThreadSleepDelay(backoff.get()),
SystemStopwatch.INSTANCE);
}
if (operation.hasFallback()) {
result = new Fallback<>(result, point.toString(),
prepareFallbackFunction(point, operation),
createExceptionDecision(operation.getFallback().skipOn(), operation.getFallback().applyOn()));
}
if (metricsProvider.isEnabled()) {
result = new MetricsCollector<>(result, getMetricsRecorder(operation, point), true,
operation.hasBulkhead(), operation.hasCircuitBreaker(), operation.hasRateLimit(),
operation.hasRetry(), operation.hasTimeout());
}
result = new FutureExecution<>(result, asyncExecutor);
return result;
}
private Supplier prepareRetryBackoff(FaultToleranceOperation operation) {
long delayMs = getTimeInMs(operation.getRetry().delay(), operation.getRetry().delayUnit());
long jitterMs = getTimeInMs(operation.getRetry().jitter(), operation.getRetry().jitterDelayUnit());
Jitter jitter = jitterMs == 0 ? Jitter.ZERO : new RandomJitter(jitterMs);
if (operation.hasExponentialBackoff()) {
int factor = operation.getExponentialBackoff().factor();
long maxDelay = getTimeInMs(operation.getExponentialBackoff().maxDelay(),
operation.getExponentialBackoff().maxDelayUnit());
return () -> new ExponentialBackOff(delayMs, factor, jitter, maxDelay);
} else if (operation.hasFibonacciBackoff()) {
long maxDelay = getTimeInMs(operation.getFibonacciBackoff().maxDelay(),
operation.getFibonacciBackoff().maxDelayUnit());
return () -> new FibonacciBackOff(delayMs, jitter, maxDelay);
} else if (operation.hasCustomBackoff()) {
Class strategy = operation.getCustomBackoff().value();
return () -> {
CustomBackoffStrategy instance;
try {
instance = strategy.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw sneakyThrow(e);
}
instance.init(delayMs);
return new CustomBackOff(instance::nextDelayInMillis);
};
} else {
return () -> new ConstantBackOff(delayMs, jitter);
}
}
private FallbackFunction prepareFallbackFunction(InterceptionPoint point, FaultToleranceOperation operation) {
AsyncSupport asyncSupport = AsyncSupportRegistry.get(operation.getParameterTypes(), operation.getReturnType());
String fallbackMethodName = operation.getFallback().fallbackMethod();
FallbackMethodCandidates candidates = !"".equals(fallbackMethodName)
? cache.getFallbackMethodCandidates(point, fallbackMethodName)
: null;
FallbackFunction fallbackFunction;
if (candidates != null) {
fallbackFunction = ctx -> {
FallbackMethod fallbackMethod = candidates.select(ctx.failure.getClass());
if (fallbackMethod == null) {
throw sneakyThrow(ctx.failure);
}
try {
Invoker invoker = fallbackMethod.createInvoker(ctx);
return asyncSupport == null ? (V) invoker.proceed() : (V) asyncSupport.toCompletionStage(invoker);
} catch (InvocationTargetException e) {
throw sneakyThrow(e.getCause());
} catch (Throwable e) {
throw new FaultToleranceException("Error during fallback method invocation", e);
}
};
} else {
FallbackHandler fallbackHandler = fallbackHandlerProvider.get(operation);
if (fallbackHandler != null) {
fallbackFunction = ctx -> {
ExecutionContextImpl executionContext = new ExecutionContextImpl(
ctx.invocationContext.get(InvocationContext.class), ctx.failure);
V result = fallbackHandler.handle(executionContext);
if (asyncSupport != null) {
result = (V) asyncSupport.fallbackResultToCompletionStage(result);
}
return result;
};
} else {
throw new FaultToleranceException("Could not obtain fallback handler for " + point);
}
}
if (specCompatibility.isOperationTrulyAsynchronous(operation) && operation.isThreadOffloadRequired()) {
fallbackFunction = new AsyncFallbackFunction(fallbackFunction, asyncExecutor);
}
return fallbackFunction;
}
private long getTimeInMs(long time, ChronoUnit unit) {
return Duration.of(time, unit).toMillis();
}
private ExceptionDecision createExceptionDecision(Class[] consideredExpected,
Class[] consideredFailure) {
return new SetBasedExceptionDecision(createSetOfThrowables(consideredFailure),
createSetOfThrowables(consideredExpected), specCompatibility.inspectExceptionCauseChain());
}
private SetOfThrowables createSetOfThrowables(Class[] throwableClasses) {
if (throwableClasses == null) {
return SetOfThrowables.EMPTY;
}
return SetOfThrowables.create(Arrays.asList(throwableClasses));
}
private MetricsRecorder getMetricsRecorder(FaultToleranceOperation operation, InterceptionPoint point) {
return cache.getMetrics(point, () -> metricsProvider.create(operation));
}
}
