shell/src/main/java/org/apache/karaf/cellar/shell/NodePingCommand.java

/*
 * Licensed 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.karaf.cellar.shell;

import org.apache.karaf.cellar.core.Node;
import org.apache.karaf.cellar.core.shell.completer.AllNodeCompleter;
import org.apache.karaf.cellar.utils.ping.Ping;
import org.apache.karaf.shell.api.action.Argument;
import org.apache.karaf.shell.api.action.Command;
import org.apache.karaf.shell.api.action.Completion;
import org.apache.karaf.shell.api.action.lifecycle.Service;

import java.util.Arrays;
import java.util.HashSet;

@Command(scope = "cluster", name = "node-ping", description = "Ping a cluster node")
@Service
public class NodePingCommand extends ClusterCommandSupport {

    private static Long TIMEOUT = 10000L;

    @Argument(index = 0, name = "node", description = "The ID or alias of the node to ping", required = true, multiValued = false)
    @Completion(AllNodeCompleter.class)
    String nodeIdOrAlias;

    @Argument(index = 1, name = "iterations", description = "The number of iterations to perform", required = false, multiValued = false)
    Integer iterations = 10;

    @Argument(index = 2, name = "interval", description = "The time in millis to wait between iteration", required = false, multiValued = false)
    Long interval = 1000L;

    @Override
    protected Object doExecute() throws Exception {
        Node node = clusterManager.findNodeByIdOrAlias(nodeIdOrAlias);
        if (node == null) {
            System.out.println("Cluster node " + nodeIdOrAlias + " doesn't exist");
            return null;
        }

        System.out.println("PING " + node.getId());
        try {
            for (int i = 1; i <= iterations; i++) {
                Long start = System.currentTimeMillis();
                Ping ping = new Ping(clusterManager.generateId());
                ping.setTimeout(timeout * 1000);
                ping.setDestination(new HashSet(Arrays.asList(node)));
                executionContext.execute(ping);
                Long stop = System.currentTimeMillis();
                Long delay = stop - start;
                if (delay >= TIMEOUT) {
                    System.err.println(String.format("TIMEOUT %s %s", i, node.getId()));
                } else {
                    System.out.println(String.format("from %s: req=%s time=%s ms", i, node.getId(), delay));
                }
                Thread.sleep(interval);
            }
        } catch (InterruptedException e) {
            // nothing to do
        } catch (Exception e) {
            throw e;
        }
        return null;
    }

}