io.activej.common.time.CurrentTimeProvider Maven / Gradle / Ivy
/*
* Copyright (C) 2020 ActiveJ LLC.
*
* 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 io.activej.common.time;
import java.time.Instant;
import static io.activej.common.Checks.checkNotNull;
/**
* Gives access to current time in milliseconds
*/
public interface CurrentTimeProvider {
/**
* @return current time in milliseconds
*/
long currentTimeMillis();
default Instant currentInstant() {
return Instant.ofEpochMilli(currentTimeMillis());
}
static CurrentTimeProvider ofSystem() {
return System::currentTimeMillis;
}
ThreadLocal THREAD_LOCAL_TIME_PROVIDER = new ThreadLocal<>();
static CurrentTimeProvider ofThreadLocal() {
return checkNotNull(THREAD_LOCAL_TIME_PROVIDER.get(), "ThreadLocal has no instance of CurrentTimeProvider associated with current thread");
}
static CurrentTimeProvider ofTimeSequence(long start, long increment) {
return new CurrentTimeProvider() {
long time = start;
@Override
public long currentTimeMillis() {
long time = this.time;
this.time += increment;
return time;
}
};
}
}