我编写了一个函数,该函数应该阻塞,直到列表中的所有实例都不处于特定状态为止,所以这是我所拥有的:
private void waitForInstanceState(List<String> instancesId, InstanceStateName state) {
int numAchievedState = 0;
while (numAchievedState != instancesId.size()) {
numAchievedState = 0;
DescribeInstanceStatusRequest describeRequest = new DescribeInstanceStatusRequest().withInstanceIds(instancesId);
DescribeInstanceStatusResult instanceStatus = ec2.describeInstanceStatus(describeRequest);
for (InstanceStatus status : instanceStatus.getInstanceStatuses()) {
if (status.getInstanceState().getName().equals(state.toString())) {
numAchievedState++;
}
}
try {
Thread.sleep(15000);
} catch (InterruptedException ex) {
Logger.getLogger(AmazonLibrary.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
调用上述函数的代码如下:
public void startInstace(List<String> instancesId) {
StartInstancesRequest startRequest = new StartInstancesRequest(instancesId);
ec2.startInstances(startRequest);
waitForInstanceState(instancesId, InstanceStateName.Running);
System.out.println("The instance has been started");
}
问题是,有时描述实例请求会为 InstanceStatus 返回 null,我认为这种情况永远不会发生,因为亚马逊中的实例总是有一个状态?此外,当在 instanceRun 函数中使用时,它可以工作,但当 InstanceStateName 设置为 Stopped 运行时,它不会。不会引发任何异常或错误。
最佳答案
以下内容完成了这项工作:
private void waitForInstanceState(List<String> instancesId, InstanceStateName state) {
int numAchievedState = 0;
while (numAchievedState != instancesId.size()) {
try {
Thread.sleep(15000);
} catch (InterruptedException ex) {
Logger.getLogger(AmazonLibrary.class.getName()).log(Level.SEVERE, null, ex);
}
numAchievedState = 0;
DescribeInstancesRequest describeInstance = new DescribeInstancesRequest().withInstanceIds(instancesId);
DescribeInstancesResult describeResult = ec2.describeInstances(describeInstance);
List<Reservation> reservations = describeResult.getReservations();
//different instances might be in different reservation requests
//so we need to traverse those
for (Reservation reservation : reservations) {
List<Instance> instances = reservation.getInstances();
for (Instance instance : instances) {
if (instance.getState().getName().equals(state.toString())) {
numAchievedState++;
}
}
}
}
}
关于java - 阻塞直到所有 EC2 实例都处于特定状态?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9191730/