/
ScheduledExecutorTaskScheduler.java
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/
ScheduledExecutorTaskScheduler.java
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/*
* Copyright 2017-2020 original 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
*
* https://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.micronaut.scheduling;
import static io.micronaut.core.util.ArgumentUtils.check;
import io.micronaut.context.annotation.Primary;
import io.micronaut.core.util.StringUtils;
import io.micronaut.scheduling.cron.CronExpression;
import javax.inject.Named;
import javax.inject.Singleton;
import java.time.Duration;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.ScheduledFuture;
import java.util.concurrent.TimeUnit;
/**
* Simple abstraction over {@link ScheduledExecutorService}.
*
* @author graemerocher
* @since 1.0
*/
@Named(TaskExecutors.SCHEDULED)
@Primary
@Singleton
public class ScheduledExecutorTaskScheduler implements TaskScheduler {
private final ScheduledExecutorService executorService;
/**
* @param executorService To schedule executor tasks
*/
public ScheduledExecutorTaskScheduler(@Named(TaskExecutors.SCHEDULED) ExecutorService executorService) {
if (!(executorService instanceof ScheduledExecutorService)) {
throw new IllegalStateException("Cannot schedule tasks on ExecutorService that is not a ScheduledExecutorService: " + executorService);
}
this.executorService = (ScheduledExecutorService) executorService;
}
@Override
public ScheduledFuture<?> schedule(String cron, Runnable command) {
if (StringUtils.isEmpty(cron)) {
throw new IllegalArgumentException("Blank cron expression not allowed");
}
check("command", command).notNull();
NextFireTime delaySupplier = new NextFireTime(CronExpression.create(cron));
return new ReschedulingTask<>(() -> {
command.run();
return null;
}, this, delaySupplier);
}
@Override
public <V> ScheduledFuture<V> schedule(String cron, Callable<V> command) {
if (StringUtils.isEmpty(cron)) {
throw new IllegalArgumentException("Blank cron expression not allowed");
}
check("command", command).notNull();
NextFireTime delaySupplier = new NextFireTime(CronExpression.create(cron));
return new ReschedulingTask<>(command, this, delaySupplier);
}
@Override
public ScheduledFuture<?> schedule(Duration delay, Runnable command) {
check("delay", delay).notNull();
check("command", command).notNull();
return executorService.schedule(
command,
delay.toMillis(),
TimeUnit.MILLISECONDS
);
}
@Override
public <V> ScheduledFuture<V> schedule(Duration delay, Callable<V> callable) {
check("delay", delay).notNull();
check("callable", callable).notNull();
return executorService.schedule(
callable,
delay.toMillis(),
TimeUnit.MILLISECONDS
);
}
@Override
public ScheduledFuture<?> scheduleAtFixedRate(Duration initialDelay, Duration period, Runnable command) {
check("period", period).notNull();
check("command", command).notNull();
long initialDelayMillis = initialDelay != null ? initialDelay.toMillis() : 0;
return executorService.scheduleAtFixedRate(
command,
initialDelayMillis,
period.toMillis(),
TimeUnit.MILLISECONDS
);
}
@Override
public ScheduledFuture<?> scheduleWithFixedDelay(Duration initialDelay, Duration delay, Runnable command) {
check("delay", delay).notNull();
check("command", command).notNull();
long initialDelayMillis = initialDelay != null ? initialDelay.toMillis() : 0;
return executorService.scheduleWithFixedDelay(
command,
initialDelayMillis,
delay.toMillis(),
TimeUnit.MILLISECONDS
);
}
}