/*
 * Copyright 2012 the original author or authors.
 *
 * 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 org.gradle.test.fixtures.concurrent

import java.util.concurrent.atomic.AtomicReference

/**
 * Represents some operation performed by a test. Has a start and end instant.
 */
class NamedOperation {
    final String name
    final Instant start
    private final AtomicReference<Instant> end = new AtomicReference<>()

    NamedOperation(String name) {
        this.name = name
        this.start = new Instant(System.nanoTime())
    }

    @Override
    String toString() {
        return "[operation $name]"
    }

    Instant getEnd() {
        def instant = end.get()
        if (instant == null) {
            throw new IllegalStateException("Operation '$name' has not completed yet.")
        }
        return instant
    }

    Duration getDuration() {
        return getEnd() - start
    }

    void completed(Instant when) {
        end.compareAndSet(null, when)
    }
}
