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• 0.2
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• AbstractScope.java

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de.leanovate.pragmatic.ioc.AbstractScope Maven / Gradle / Ivy

package de.leanovate.pragmatic.ioc;

import java.util.LinkedList;
import java.util.Objects;
import java.util.function.Supplier;

public abstract class AbstractScope implements Scope {
    protected ThreadLocal> createStack = ThreadLocal.withInitial(LinkedList::new);

    protected  T createInstance(final String key, final Supplier supplier) {

        final LinkedList stack = createStack.get();
        if (stack.contains(key)) {
            throw new CyclicDependencyException(stack);
        }
        try {
            stack.add(key);
            return Objects.requireNonNull(supplier.get(), () -> "Instantiation of '" + key + "' failed");
        } finally {
            stack.removeLast();
            if (stack.isEmpty()) {
                createStack.remove();
            }
        }
    }
}