org.jolokia.jvmagent.client.command.StartCommand Maven / Gradle / Ivy
package org.jolokia.jvmagent.client.command;
/*
* Copyright 2009-2013 Roland Huss
*
* 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.
*/
import org.jolokia.jvmagent.client.util.OptionsAndArgs;
import org.jolokia.jvmagent.client.util.VirtualMachineHandlerOperations;
/**
* Load a Jolokia Agent and start it. Whether an agent is started is decided by the existence of the
* system property {@see JvmAgent#JOLOKIA_AGENT_URL}.
*
* @author roland
* @since 06.10.11
*/
public class StartCommand extends AbstractBaseCommand {
/** {@inheritDoc} */
@Override
String getName() {
return "start";
}
/** {@inheritDoc} */
@Override
@SuppressWarnings("PMD.SystemPrintln")
int execute(OptionsAndArgs pOpts, Object pVm, VirtualMachineHandlerOperations pHandler) {
String agentUrl;
agentUrl = checkAgentUrl(pVm, pHandler);
boolean quiet = pOpts.isQuiet();
if (agentUrl == null) {
loadAgent(pVm, pHandler, pOpts);
agentUrl = checkAgentUrl(pVm, pHandler);
if (agentUrl == null) {
// Wait a bit and try again
agentUrl = checkAgentUrl(pVm, pHandler, 500);
if (agentUrl == null) {
System.err.println("Couldn't start agent for " + getProcessDescription(pHandler, pOpts));
System.err.println("Possible reason could be that port '" + pOpts.getPort() + "' is already occupied.");
System.err.println("Please check the standard output of the target process for a detailed error message.");
return 1;
}
}
if (!quiet) {
System.out.println("Started Jolokia for " + getProcessDescription(pHandler, pOpts));
System.out.println(agentUrl);
}
return 0;
} else {
if (!quiet) {
System.out.println("Jolokia is already attached to " + getProcessDescription(pHandler, pOpts));
System.out.println(agentUrl);
}
return 1;
}
}
}