Description
Problem Statement
The current implementation of the checkLocalConfig method in ClientWoker has multiple conditional checks that are not only redundant but also make the code difficult to read and maintain. In addition, the method contains duplication in logic for handling failover file creation, changes, and deletion events.
Proposed Change
I propose an optimization of the checkLocalConfig method that simplifies the code, reduces redundancy, and enhances maintainability. The key changes include:
- Consolidating the conditions that check for the existence, creation, and modification of the failover file into a streamlined logical structure.
- Removing duplicate code blocks and extracting them into reusable code snippets where appropriate.
Impact of Change
This optimization does not impact the existing functionality but rather improves the internal code quality of the method. It is a non-breaking change that retains all existing behaviors while streamlining the code.
Suggested Implementation
I have already implemented a version of this optimized method and am prepared to submit a Pull Request for further review and testing by the Nacos community. The proposed implementation can be found in the following snippet:
public void checkLocalConfig(CacheData cacheData) {
final String dataId = cacheData.dataId;
final String group = cacheData.group;
final String tenant = cacheData.tenant;
final String envName = cacheData.envName;
// Check if a failover file exists for the specified dataId, group, and tenant.
File file = LocalConfigInfoProcessor.getFailoverFile(envName, dataId, group, tenant);
// not using local config info, but a failover file exists
boolean failOverFileCreated = !cacheData.isUseLocalConfigInfo() && file.exists();
// using local config info, but there is a change in local configuration
boolean failOverFileChanged= cacheData.isUseLocalConfigInfo() && file.exists() && cacheData.getLocalConfigInfoVersion() != file.lastModified();
// using local config info, but the failover file is deleted
boolean failOverFileDeleted = cacheData.isUseLocalConfigInfo() && !file.exists();
if (failOverFileCreated || failOverFileChanged) {
// load and use the file content
String content = LocalConfigInfoProcessor.getFailover(envName, dataId, group, tenant);
final String md5 = MD5Utils.md5Hex(content, Constants.ENCODE);
cacheData.setUseLocalConfigInfo(true);
cacheData.setLocalConfigInfoVersion(file.lastModified());
cacheData.setContent(content);
LOGGER.warn(
"[{}] [failover-change] failover file {}. dataId={}, group={}, tenant={}, md5={}, content={}",
failOverFileCreated ? "created" : "changed", envName, dataId, group, tenant, md5, ContentUtils.truncateContent(content));;
}
if (failOverFileDeleted) {
// switch back to server config.
cacheData.setUseLocalConfigInfo(false);
LOGGER.warn("[{}] [failover-change] failover file deleted. dataId={}, group={}, tenant={}", envName,
dataId, group, tenant);
}
}Please let me know if there are any concerns or additional considerations that should be taken into account. I believe this optimization aligns with the goals of maintaining high code quality and I look forward to the community's feedback.
Thanks for considering this proposal.