asterix-installer/src/main/java/edu/uci/ics/asterix/installer/command/DescribeCommand.java

/*
 * Copyright 2009-2012 by The Regents of the University of California
 * 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 from
 * 
 *     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 edu.uci.ics.asterix.installer.command;

import java.util.List;

import org.kohsuke.args4j.Option;

import edu.uci.ics.asterix.installer.driver.InstallerDriver;
import edu.uci.ics.asterix.installer.driver.InstallerUtil;
import edu.uci.ics.asterix.installer.error.InstallerException;
import edu.uci.ics.asterix.installer.error.VerificationUtil;
import edu.uci.ics.asterix.installer.model.AsterixInstance;
import edu.uci.ics.asterix.installer.model.AsterixInstance.State;
import edu.uci.ics.asterix.installer.model.AsterixRuntimeState;
import edu.uci.ics.asterix.installer.service.ServiceProvider;

public class DescribeCommand extends AbstractCommand {

	@Override
	protected void execCommand() throws Exception {
		InstallerDriver.initConfig();
		String asterixInstanceName = ((DescribeConfig) config).name;
		boolean adminView = ((DescribeConfig) config).admin;
		if (asterixInstanceName != null) {
			InstallerUtil.validateAsterixInstanceExists(asterixInstanceName,
					State.INACTIVE, State.ACTIVE, State.UNUSABLE);
			AsterixInstance instance = ServiceProvider.INSTANCE
					.getLookupService().getAsterixInstance(asterixInstanceName);
			if (instance != null) {
				AsterixRuntimeState state = VerificationUtil
						.getAsterixRuntimeState(instance);
				boolean expectedRunning = instance.getState().equals(
						State.UNUSABLE) ? instance.getPreviousState().equals(
						State.ACTIVE) : !instance.getState().equals(
						State.INACTIVE);
				VerificationUtil.updateInstanceWithRuntimeDescription(instance,
						state, expectedRunning);
				ServiceProvider.INSTANCE.getLookupService()
						.updateAsterixInstance(instance);
				LOGGER.info(instance.getDescription(adminView));
			} else {
				throw new InstallerException("Asterix instance by the name "
						+ asterixInstanceName + " does not exist.");
			}
		} else {
			List<AsterixInstance> asterixInstances = ServiceProvider.INSTANCE
					.getLookupService().getAsterixInstances();
			if (asterixInstances.size() > 0) {
				for (AsterixInstance instance : asterixInstances) {
					AsterixRuntimeState state = VerificationUtil
							.getAsterixRuntimeState(instance);
					boolean expectedRunning = instance.getState().equals(
							State.UNUSABLE) ? instance.getPreviousState()
							.equals(State.ACTIVE) : !instance.getState()
							.equals(State.INACTIVE);
					VerificationUtil.updateInstanceWithRuntimeDescription(
							instance, state, expectedRunning);
					ServiceProvider.INSTANCE.getLookupService()
							.updateAsterixInstance(instance);
					LOGGER.info(instance.getDescription(adminView));
				}
			} else {
				LOGGER.info("No Asterix instances found!");
			}

		}
	}

	@Override
	protected CommandConfig getCommandConfig() {
		return new DescribeConfig();
	}

	@Override
	protected String getUsageDescription() {
		return "\nProvides information about an ASTERIX instance."
				+ "\n\nUsage arguments/options:-"
				+ "\n[-n]       Name of the ASTERIX instance."
				+ "\n[-admin]   Provides a detailed description";
	}

}

class DescribeConfig extends AbstractCommandConfig {

	@Option(name = "-n", required = false, usage = "Name of Asterix Instance")
	public String name;

	@Option(name = "-admin", required = false, usage = "Detailed description")
	public boolean admin;

}