/**
* Read project meta from zookeeper
*
* @param projectName name of the project
* @return project meta
* @throws KeeperException throws when write project meta to zookeeper
* @throws InterruptedException if the zookeeper server transaction is interrupted
*/
private ProjectMeta constrcutProjectMeta(String projectName)
throws KeeperException, InterruptedException {
ProjectMeta projectMeta = null;
String packageRoot = null;
String masterAddr = null;
String projectPath = Utils.getProjectRootPath(projectName);
byte[] b = zk.getData(projectPath, false, null);
// read the master meta
MasterMeta maserMeta = JsonUtils.getObject(b, MasterMeta.class);
packageRoot = maserMeta.getPackageRoot();
masterAddr = maserMeta.getMasterAddr();
String projectMetaPath = Utils.getProjectMetaRootPath(projectName);
List<String> packageNameList = zk.getChildren(projectMetaPath, false);
// read package list
projectMeta =
new ProjectMeta(
projectName,
masterAddr,
packageRoot,
readPackageInfo(projectMetaPath, packageNameList));
return projectMeta;
}
/**
* Read package info from zookeeper.
*
* @param packageRootPath the root path of the packages
* @param packageNameList the list of package names
* @return the list of package metas
* @throws KeeperException throws when write project meta to zookeeper
* @throws InterruptedException if the zookeeper server transaction is interrupted
*/
private List<PackageMeta> readPackageInfo(String packageRootPath, List<String> packageNameList)
throws KeeperException, InterruptedException {
List<PackageMeta> packageMetaList = new ArrayList<PackageMeta>();
for (String pkgName : packageNameList) {
String packagePath = Utils.constructString(packageRootPath, Global.PATH_SEPARATOR, pkgName);
// read package data and construct the meta object
byte[] data = zk.getData(packagePath, false, null);
PackageMeta packageMeta = JsonUtils.getObject(data, PackageMeta.class);
packageMetaList.add(packageMeta);
}
return packageMetaList;
}