Java Eclipse RCP IJob:限制并发执行作业的数量
如何让EclipseRCP作业管理同时运行最多x个作业 编辑: 它通过使用答案中描述的自定义调度规则来工作 不要将同一规则引用传递给多个作业,这一点很重要 以下是我使用的类: 公营就业主任{Java Eclipse RCP IJob:限制并发执行作业的数量,java,eclipse-rcp,Java,Eclipse Rcp,如何让EclipseRCP作业管理同时运行最多x个作业 编辑: 它通过使用答案中描述的自定义调度规则来工作 不要将同一规则引用传递给多个作业,这一点很重要 以下是我使用的类: 公营就业主任{ private class Listener implements IJobChangeListener { @Override public void aboutToRun(final IJobChangeEvent event) { } @Override p
private class Listener implements IJobChangeListener {
@Override
public void aboutToRun(final IJobChangeEvent event) {
}
@Override
public void awake(final IJobChangeEvent event) {
}
@Override
public void done(final IJobChangeEvent event) {
synchronized (JobMaster.this) {
running--;
System.err.println("now running " + running);
}
}
@Override
public void running(final IJobChangeEvent event) {
synchronized (JobMaster.this) {
running++;
System.err.println("now running " + running);
}
}
@Override
public void scheduled(final IJobChangeEvent event) {
}
@Override
public void sleeping(final IJobChangeEvent event) {
}
}
private class MyRule implements ISchedulingRule {
public MyRule() {
}
@Override
public boolean contains(final ISchedulingRule rule) {
if (rule == this) {
return true;
}
return false;
}
@Override
public boolean isConflicting(final ISchedulingRule rule) {
synchronized (JobMaster.this) {
if (rule == this) {
return true;
}
if (rule instanceof MyRule) {
return running >= maxRun;
}
return false;
}
}
}
private final Listener l = new Listener();
private final int maxRun;
private volatile int running = 0;
public JobMaster(final int maxRun) {
this.maxRun = maxRun;
}
public synchronized void add(final Job j) {
j.setRule(new MyRule());
j.addJobChangeListener(l);
j.schedule();
}
}作业管理器无法限制作业总数 对于正在创建的作业,可以创建一个
isSchedulingRule
规则,该规则限制同时运行的作业数量。调用Job.setRule(rule)
设置作业的规则(在安排作业之前执行此操作)
调度规则示例(来自Java调试):
这将停止一次运行多个使用特定对象的作业
更新:
作业管理器检查调度规则的以下条件:
// contains method must be reflexive
Assert.isLegal(rule.contains(rule));
// contains method must return false when given an unknown rule
Assert.isLegal(!rule.contains(nullRule));
// isConflicting method must be reflexive
Assert.isLegal(rule.isConflicting(rule));
// isConflicting method must return false when given an unknown rule
Assert.isLegal(!rule.isConflicting(nullRule));
从Eclipse Mars(4.5)开始,可以使用作业组来限制并发线程的数量:
JobGroup jobGroup = new JobGroup("Job...", /* maxThreads*/ 10, /* seedJobsCount */ 100);
for (int ii = 0; ii < 100; ii++)
{
Job job = new Job("job name")
{
@Override
protected IStatus run(IProgressMonitor monitor)
{
// do something
return Status.OK_STATUS;
}
};
job.setJobGroup(jobGroup);
job.schedule();
}
jobGroup.join(10000, monitor);
JobGroup JobGroup=new JobGroup(“作业…”,/*maxThreads*/10,/*seedjobsunt*/100);
对于(int ii=0;ii<100;ii++)
{
作业=新作业(“作业名称”)
{
@凌驾
受保护的IStatus运行(IProgressMonitor监视器)
{
//做点什么
返回状态。OK_状态;
}
};
job.setJobGroup(作业组);
job.schedule();
}
jobGroup.join(10000,监视器);
我已经尝试使用调度规则。不幸的是,这不起作用:java.lang.IllegalArgumentException:at org.eclipse.core.runtime.Assert.isLegal(Assert.java:63)at org.eclipse.core.runtime.Assert.isLegal(Assert.java:47)at org.eclipse.core.internal.jobs.JobManager.validateRule(JobManager.java:1573)Assert.isLegal(rule.isConflicting(rule));这说明你的规则的逻辑是错误的。规则必须是“自反的”-isConflicting
,传递的规则与参数必须返回true的规则相同。在回答中添加了要求参见关于JobGroup的回答,作为支持的实现节流/限制的方式。
JobGroup jobGroup = new JobGroup("Job...", /* maxThreads*/ 10, /* seedJobsCount */ 100);
for (int ii = 0; ii < 100; ii++)
{
Job job = new Job("job name")
{
@Override
protected IStatus run(IProgressMonitor monitor)
{
// do something
return Status.OK_STATUS;
}
};
job.setJobGroup(jobGroup);
job.schedule();
}
jobGroup.join(10000, monitor);