spring LocalTaskExecutorThreadPool 源码
spring LocalTaskExecutorThreadPool 代码
文件路径：/spring-context-support/src/main/java/org/springframework/scheduling/quartz/LocalTaskExecutorThreadPool.java
/*
* Copyright 2002-2018 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
*
* 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 org.springframework.scheduling.quartz;
import java.util.concurrent.Executor;
import java.util.concurrent.RejectedExecutionException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.quartz.SchedulerConfigException;
import org.quartz.spi.ThreadPool;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Quartz {@link ThreadPool} adapter that delegates to a Spring-managed
* {@link Executor} instance, specified on {@link SchedulerFactoryBean}.
*
* @author Juergen Hoeller
* @since 2.0
* @see SchedulerFactoryBean#setTaskExecutor
*/
public class LocalTaskExecutorThreadPool implements ThreadPool {
/** Logger available to subclasses. */
protected final Log logger = LogFactory.getLog(getClass());
@Nullable
private Executor taskExecutor;
@Override
public void setInstanceId(String schedInstId) {
}
@Override
public void setInstanceName(String schedName) {
}
@Override
public void initialize() throws SchedulerConfigException {
// Absolutely needs thread-bound Executor to initialize.
this.taskExecutor = SchedulerFactoryBean.getConfigTimeTaskExecutor();
if (this.taskExecutor == null) {
throw new SchedulerConfigException("No local Executor found for configuration - " +
"'taskExecutor' property must be set on SchedulerFactoryBean");
}
}
@Override
public void shutdown(boolean waitForJobsToComplete) {
}
@Override
public int getPoolSize() {
return -1;
}
@Override
public boolean runInThread(Runnable runnable) {
Assert.state(this.taskExecutor != null, "No TaskExecutor available");
try {
this.taskExecutor.execute(runnable);
return true;
}
catch (RejectedExecutionException ex) {
logger.error("Task has been rejected by TaskExecutor", ex);
return false;
}
}
@Override
public int blockForAvailableThreads() {
// The present implementation always returns 1, making Quartz
// always schedule any tasks that it feels like scheduling.
// This could be made smarter for specific TaskExecutors,
// for example calling {@code getMaximumPoolSize() - getActiveCount()}
// on a {@code java.util.concurrent.ThreadPoolExecutor}.
return 1;
}
}
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