pkuwm commented on a change in pull request #1357:
URL: https://github.com/apache/helix/pull/1357#discussion_r492334597
##########
File path:
helix-rest/src/main/java/org/apache/helix/rest/server/HelixRestServer.java
##########
@@ -162,6 +168,24 @@ protected ResourceConfig
getResourceConfig(HelixRestNamespace namespace, Servlet
return cfg;
}
+ /*
+ * Initialize metric registry and jmx reporter for each namespace.
+ */
+ private void initMetricRegistry(ResourceConfig cfg, String namespace) {
Review comment:
This will be called after a servlet is init. We don't need concurrency
control same as `initServlet()`
##########
File path:
helix-rest/src/main/java/org/apache/helix/rest/server/HelixRestObjectNameFactory.java
##########
@@ -0,0 +1,86 @@
+package org.apache.helix.rest.server;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+import java.util.Hashtable;
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+
+import com.codahale.metrics.jmx.ObjectNameFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Creates an {@link ObjectName} that has "name", "type", "namespace"
properties
+ * for metrics registry in Helix rest service.
+ *
+ * <p>It is recommended to only be used within Helix REST.
+ */
+class HelixRestObjectNameFactory implements ObjectNameFactory {
+ private static final Logger LOG =
LoggerFactory.getLogger(HelixRestObjectNameFactory.class);
+
+ private static final String KEY_NAME = "name";
+ private static final String KEY_TYPE = "type";
+ private static final String KEY_NAMESPACE = "namespace";
+
+ public ObjectName createName(String type, String domainNameSpace, String
name) {
+ String[] splits = domainNameSpace.split(":");
+ String domain = splits[0];
+ String namespace = splits[1];
+
+ try {
+ Hashtable<String, String> properties = new Hashtable<>();
+ properties.put(KEY_NAME, name);
+ properties.put(KEY_TYPE, type);
+ properties.put(KEY_NAMESPACE, namespace);
+
+ /*
+ * The only way we can find out if we need to quote the properties is by
Review comment:
I will keep it then.
##########
File path:
helix-rest/src/main/java/org/apache/helix/rest/server/HelixRestObjectNameFactory.java
##########
@@ -0,0 +1,90 @@
+package org.apache.helix.rest.server;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+import java.util.Hashtable;
+import javax.management.MalformedObjectNameException;
+import javax.management.ObjectName;
+
+import com.codahale.metrics.jmx.ObjectNameFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Creates an {@link ObjectName} that has "name", "type" and "namespace"
properties
+ * for metrics registry in Helix rest service.
+ *
+ * <p>It is recommended to only be used within Helix REST.
+ */
+class HelixRestObjectNameFactory implements ObjectNameFactory {
+ private static final Logger LOG =
LoggerFactory.getLogger(HelixRestObjectNameFactory.class);
+
+ private static final String KEY_NAME = "name";
+ private static final String KEY_TYPE = "type";
+ private static final String KEY_NAMESPACE = "namespace";
+
+ private final String _namespace;
+
+ HelixRestObjectNameFactory(String nameSpace) {
+ _namespace = nameSpace;
+ }
+
+ public ObjectName createName(String type, String domain, String name) {
Review comment:
No. `Hashtable` has the null check. If any property is null, NPE will be
thrown.
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