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package io.smallrye.faulttolerance.internal;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Supplier;

import javax.inject.Inject;
import javax.inject.Singleton;

import io.smallrye.faulttolerance.SpecCompatibility;
import io.smallrye.faulttolerance.core.FaultToleranceStrategy;
import io.smallrye.faulttolerance.core.metrics.MetricsRecorder;

@Singleton
public class StrategyCache {
    private final Map> strategies = new ConcurrentHashMap<>();
    private final Map metricsRecorders = new ConcurrentHashMap<>();
    private final Map fallbackMethods = new ConcurrentHashMap<>();

    private final SpecCompatibility specCompatibility;

    @Inject
    public StrategyCache(SpecCompatibility specCompatibility) {
        this.specCompatibility = specCompatibility;
    }

    @SuppressWarnings("unchecked")
    public  FaultToleranceStrategy getStrategy(InterceptionPoint point,
            Supplier> producer) {
        return (FaultToleranceStrategy) strategies.computeIfAbsent(point, ignored -> producer.get());
    }

    public MetricsRecorder getMetrics(InterceptionPoint point, Supplier producer) {
        return metricsRecorders.computeIfAbsent(point, ignored -> producer.get());
    }

    public FallbackMethodCandidates getFallbackMethodCandidates(InterceptionPoint point, String fallbackMethodName) {
        return fallbackMethods.computeIfAbsent(point, ignored -> FallbackMethodCandidates.create(
                point, fallbackMethodName, specCompatibility.allowFallbackMethodExceptionParameter()));
    }
}