io.undertow.server.handlers.proxy.mod_cluster.NodeLbStatus Maven / Gradle / Ivy
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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including
all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and
JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up
with different versions on classes on the class path).
/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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
*
* http://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.undertow.server.handlers.proxy.mod_cluster;
/**
* The load-balancing information of a node.
*
* @author Emanuel Muckenhuber
*/
// move this back to Node
class NodeLbStatus {
private volatile int oldelected;
private volatile int lbfactor;
private volatile int lbstatus;
private volatile int elected;
public int getLbFactor() {
return lbfactor;
}
public int getElected() {
return elected;
}
synchronized int getElectedDiff() {
return elected - oldelected;
}
/**
* Update the load balancing status.
*
* @return
*/
synchronized boolean update() {
int elected = this.elected;
int oldelected = this.oldelected;
int lbfactor = this.lbfactor;
if (lbfactor > 0) {
this.lbstatus = ((elected - oldelected) * 1000) / lbfactor;
}
this.oldelected = elected;
return elected != oldelected; // ping if they are equal
}
synchronized void elected() {
if (elected == Integer.MAX_VALUE) {
oldelected = (elected - oldelected);
elected = 1;
} else {
elected++;
}
}
void updateLoad(int load) {
lbfactor = load;
}
/**
* Get the load balancing status.
*
* @return
*/
synchronized int getLbStatus() {
int lbfactor = this.lbfactor;
if (lbfactor > 0) {
return (((elected - oldelected) * 1000) / lbfactor) + lbstatus;
} else {
return -1;
}
}
}