MonitorCommand.java

/*
 * 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.
 */

package org.apache.zookeeper.server.command;

import java.io.PrintWriter;
import org.apache.zookeeper.server.ServerCnxn;
import org.apache.zookeeper.server.ServerMetrics;

public class MonitorCommand extends AbstractFourLetterCommand {

    MonitorCommand(PrintWriter pw, ServerCnxn serverCnxn) {
        super(pw, serverCnxn);
    }

    @Override
    public void commandRun() {
        if (!isZKServerRunning()) {
            pw.println(ZK_NOT_SERVING);
            return;
        }

        // non metrics
        zkServer.dumpMonitorValues(this::print);

        ServerMetrics.getMetrics().getMetricsProvider().dump(this::print);
    }

    private void print(String key, Object value) {
        if (value == null) {
            output(key, null);
        } else if (value instanceof Long || value instanceof Integer) {
            // format as integers
            output(key, value + "");
        } else if (value instanceof Number) {
            // format as floating point
            output(key, ((Number) value).doubleValue() + "");
        } else {
            output(key, value.toString());
        }
    }

    private void output(String key, String value) {
        pw.print("zk_");
        pw.print(key);
        pw.print("\t");
        pw.println(value);
    }

}