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https://issues.apache.org/jira/browse/SCB-706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16545911#comment-16545911
]
ASF GitHub Bot commented on SCB-706:
------------------------------------
liubao68 commented on a change in pull request #803: [SCB-706]change filters
to discovery filters and support invocation based filters
URL:
https://github.com/apache/incubator-servicecomb-java-chassis/pull/803#discussion_r202869612
##########
File path:
handlers/handler-loadbalance/src/main/java/org/apache/servicecomb/loadbalance/LoadbalanceHandler.java
##########
@@ -121,67 +114,40 @@ public void handle(Invocation invocation, AsyncResponse
asyncResp) throws Except
}
private void clearLoadBalancer() {
- for (LoadBalancer loadBalancer : loadBalancerMap.values()) {
- loadBalancer.shutdown();
+ for (LoadBalancerCreator creator : loadBalancerMap.values()) {
+ creator.shutdown();
}
loadBalancerMap.clear();
}
- protected void setIsolationFilter(LoadBalancer lb, String microserviceName) {
- final String filterName = IsolationServerListFilter.class.getName();
- IsolationServerListFilter isolationListFilter = new
IsolationServerListFilter();
- isolationListFilter.setMicroserviceName(microserviceName);
- isolationListFilter.setLoadBalancerStats(lb.getLoadBalancerStats());
- lb.putFilter(filterName, isolationListFilter);
- }
-
- protected void setTransactionControlFilter(LoadBalancer lb, String
microserviceName) {
- final String filterName = TransactionControlFilter.class.getName();
+ protected void setTransactionControlFilter(String microserviceName) {
String policyClsName =
Configuration.INSTANCE.getFlowsplitFilterPolicy(microserviceName);
- if (policyClsName.isEmpty()) {
- return;
- }
- try {
- Class<?> policyCls = Class.forName(policyClsName);
- if (!TransactionControlFilter.class.isAssignableFrom(policyCls)) {
- String errMsg = String.format(
- "Define instance filter %s in yaml, but not extends abstract class
TransactionControlFilter.",
- policyClsName);
- LOGGER.error(errMsg);
- throw new Error(errMsg);
- }
- TransactionControlFilter transactionControlFilter =
(TransactionControlFilter) policyCls.newInstance();
- transactionControlFilter.setLoadBalancerStats(lb.getLoadBalancerStats());
- transactionControlFilter.setMicroserviceName(microserviceName);
- lb.putFilter(filterName, transactionControlFilter);
- } catch (Throwable e) {
- String errMsg = "Fail to create instance of class: " + policyClsName;
- LOGGER.error(errMsg);
- throw new Error(errMsg, e);
+ if (!policyClsName.isEmpty()) {
+ LOGGER.error(Configuration.TRANSACTIONCONTROL_POLICY_KEY_PATTERN + " is
not supported anymore." +
+ "You can change this class to SPI, and filters will be loaded by
SPI.");
Review comment:
Document added :
https://huaweicse.github.io/servicecomb-java-chassis-doc/zh_CN/references-handlers/loadbalance.html
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> refactor loadbalance filters logic to support invocation based filter
> ---------------------------------------------------------------------
>
> Key: SCB-706
> URL: https://issues.apache.org/jira/browse/SCB-706
> Project: Apache ServiceComb
> Issue Type: Improvement
> Reporter: liubao
> Assignee: liubao
> Priority: Major
>
> Why we do this?
> # When implement invocation based filter, e.g. darklaunch deployment, we
> need to filter servers based on invocation parameters. But now, we create a
> Loadbalaner instance for each service, and Robin filter interface can not
> pass Invocation to it. Before refactor, we doing this by ThreadLocal and
> cache Invocation, and use in filter implementation. This is error prone and
> users can't handle this complixity
> # We have other improvements, e.g. SCB-700, we can do server status check,
> and add a filter a choose from active servers. We need to consider filter
> orders and other feature, current implementation not satisfy this.
> # We want to make loadbalance code handy by remove some compatible fixes.
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