com.spotify.metrics.ffwdhttp.Clock Maven / Gradle / Ivy

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/*
 * Copyright (c) 2016 Spotify AB.
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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 com.spotify.metrics.ffwdhttp;

/**
 * A clock shim.
 */
public interface Clock {
    long currentTimeMillis();

    class SystemTime implements Clock {
        @Override
        public long currentTimeMillis() {
            return System.currentTimeMillis();
        }
    }

    class Fixed implements Clock {
        private long currentTime;

        public Fixed(final long currentTime) {
            this.currentTime = currentTime;
        }

        public void setCurrentTime(final long currentTime) {
            this.currentTime = currentTime;
        }

        @Override
        public long currentTimeMillis() {
            return currentTime;
        }
    }
}