我们最近将Spring应用程序与一个数据库支持的2个节点进行了集群。 我们的应用程序具有动态菜单（每个用户都有不同的菜单选项），因为每次用户登录时我们都没有足够的缓存，我们点击数据库并根据用户安全性过滤菜单选项。我们希望每次用户通过引入Cache登录时都避免访问数据库。
我正在阅读关于hazelcast缓存http://hazelcast.org/use-cases/caching/的内容，我注意到有多个可用于缓存的选项，例如In-Memory Data Grid/NoSql，Jcache和Spring Cache但不确定哪一个是最佳解决方案缓存Menu项（String类型）。根据我的理解，我觉得Spring Cache是我的用例的正确解决方案，如果没有，请建议我其他的hazelcast缓存选项。
答案 0 :(得分：5)
Spring Caching支持Hazelcast（或Hazelcast提供与Spring Caching class A{
private int x = 13;
public A(){
//use default value for x
}
public A(int x){
this.x = x;
}
}
class B extends A {
private int y = 0;
public B(){
//use default value for x and y
}
public B(int x){
super(x);
//use default value for y
}
public B(int x, int y){
super(x);
this.y = y;
}
}
的集成）。
如果您使用 Spring 4 和更高版本，则可以使用Spring Framework的JCache caching支持。
您可以找到使用示例here。
寻找override func viewDidLayoutSubviews() {
var newOrientation: AVCaptureVideoOrientation
var orientation: UIDeviceOrientation = UIDevice.currentDevice().orientation
switch (orientation) {
case .Portrait:
newOrientation = .Portrait;
var frame = buttonsview.frame
frame.size.width = 320
frame.size.height = 50
let totalWidth : CGFloat = self.view.bounds.size.width
var x:CGFloat = 0.0;
if( totalWidth>320)
{
x = (totalWidth-320.0)/2.0
}
frame.origin.x = x
frame.origin.y = self.view.bounds.size.height-50
buttonsview.frame = frame
buttonsview.layoutSubviews()
view.addSubview(buttonsview)
self.activityView.center = self.view.center
break;
case .PortraitUpsideDown:
newOrientation = .PortraitUpsideDown;
var frame = buttonsview.frame
frame.size.width = 320
frame.size.height = 50
let totalWidth : CGFloat = self.view.bounds.size.width
var x:CGFloat = 0.0;
if( totalWidth>320)
{
x = (totalWidth-320.0)/2.0
}
frame.origin.x = x
frame.origin.y = self.view.bounds.size.height-50
buttonsview.frame = frame
buttonsview.layoutSubviews()
view.addSubview(buttonsview)
self.activityView.center = self.view.center
break
case .LandscapeLeft:
newOrientation = .LandscapeRight;
var frame = buttonsview.frame
frame.size.width = 320
frame.size.height = 50
let totalWidth : CGFloat = self.view.bounds.size.width
var x:CGFloat = 0.0;
if( totalWidth>320)
{
x = (totalWidth-320.0)/2.0
}
frame.origin.x = x
frame.origin.y = self.view.bounds.size.height-50
buttonsview.frame = frame
view.addSubview(buttonsview)
self.activityView.center = self.view.center
break
case .LandscapeRight:
newOrientation = .LandscapeLeft;
var frame = buttonsview.frame
frame.size.width = 320
frame.size.height = 50
let totalWidth : CGFloat = self.view.bounds.size.width
var x:CGFloat = 0.0;
if( totalWidth>320)
{
x = (totalWidth-320.0)/2.0
}
frame.origin.x = x
frame.origin.y = self.view.bounds.size.height-50
buttonsview.frame = frame
view.addSubview(buttonsview)
self.activityView.center = self.view.center
break;
default:
newOrientation = .Portrait;
var frame = buttonsview.frame
frame.size.width = 320
frame.size.height = 50
let totalWidth : CGFloat = self.view.bounds.size.width
var x:CGFloat = 0.0;
if( totalWidth>320)
{
x = (totalWidth-320.0)/2.0
}
frame.origin.x = x
frame.origin.y = self.view.bounds.size.height-50
buttonsview.frame = frame
buttonsview.layoutSubviews()
view.addSubview(buttonsview)
self.activityView.center = self.view.center
}
let newSize = self.view.bounds.size;
previewLayer.position = CGPointMake(0.5 * newSize.width, 0.5 * newSize.height);
}
override func willAnimateRotationToInterfaceOrientation(toInterfaceOrientation: UIInterfaceOrientation, duration: NSTimeInterval) {
CATransaction.begin()
CATransaction.setAnimationDuration(duration)
CATransaction.setAnimationTimingFunction(CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut));
updatePreviewLayerForOrientation(toInterfaceOrientation);
CATransaction.commit();
}
func updatePreviewLayerForOrientation(interfaceOrientation: UIInterfaceOrientation)
{
// Correct position of previewLayer
let newSize = view.bounds.size;
previewLayer.position = CGPointMake(0.5 * newSize.width, 0.5 * newSize.height);
var angle: Double!
// Rotate the previewLayer, in order to have camera picture right
switch interfaceOrientation {
case .Portrait:
angle = 0
case .LandscapeLeft:
angle = M_PI/2
case .LandscapeRight:
angle = -M_PI/2
default: // .PortraitUpsideDown
angle = M_PI
}
previewLayer.setAffineTransform(CGAffineTransformMakeRotation(CGFloat(angle)))
}
个项目。
也支持Spring Boot。观看在线讲座recording，阅读我的blog post，找到代码示例here。
如果您有任何问题，请与我们联系。
谢谢