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package io.smallrye.faulttolerance.core;

import static io.smallrye.faulttolerance.core.CoreLogger.LOG;

import java.util.concurrent.Callable;

/**
 * A "sentinel" fault tolerance strategy that does no processing, it only invokes the guarded {@link Callable}.
 * This is supposed to be used as the last fault tolerance stragegy in a chain.
 * 
 * There's only one instance of this class, accessible using {@link #invocation()}.
 */
public final class Invocation implements FaultToleranceStrategy {
    private static final Invocation INSTANCE = new Invocation<>();

    @SuppressWarnings("unchecked")
    public static  Invocation invocation() {
        return (Invocation) INSTANCE;
    }

    private Invocation() {
        // avoid instantiation
    }

    @Override
    public V apply(InvocationContext ctx) throws Exception {
        LOG.trace("Guarded method invocation started");
        try {
            return ctx.call();
        } finally {
            LOG.trace("Guarded method invocation finished");
        }
    }
}