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 *
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 * provided that the following conditions are met:
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 * 1. Redistributions of source code must retain the above copyright notice, this list of conditions
 * and the following disclaimer.
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package org.openjdk.jmc.rjmx.services.internal;

import javax.management.MBeanServerConnection;

import org.openjdk.jmc.rjmx.ConnectionException;
import org.openjdk.jmc.rjmx.ConnectionToolkit;
import org.openjdk.jmc.rjmx.IConnectionHandle;
import org.openjdk.jmc.rjmx.ServiceNotAvailableException;
import org.openjdk.jmc.rjmx.services.ICommercialFeaturesService;
import org.openjdk.jmc.rjmx.services.IDiagnosticCommandService;
import javax.management.ObjectName;

public class HotSpot23CommercialFeaturesService implements ICommercialFeaturesService {
	private final static String VM_FLAG = "UnlockCommercialFeatures"; //$NON-NLS-1$
	private final static String UNLOCK_COMMAND = "VM.unlock_commercial_features"; //$NON-NLS-1$
	private final MBeanServerConnection server;
	private final IDiagnosticCommandService dcs;
	private final static String JFR2_MBEAN_OBJECT_NAME = "jdk.management.jfr:type=FlightRecorder"; //$NON-NLS-1$

	public HotSpot23CommercialFeaturesService(IConnectionHandle handle)
			throws ConnectionException, ServiceNotAvailableException {
		server = handle.getServiceOrThrow(MBeanServerConnection.class);
		dcs = handle.getServiceOrNull(IDiagnosticCommandService.class);
		try {
			HotspotManagementToolkit.getVMOption(server, VM_FLAG); // Will fail if option is not available
		} catch (Exception e) {
			// Commercial Feature option is not available but Flighter Recorder is.
			if (!isJfrMBeanAvailable()) {
				throw new ServiceNotAvailableException(""); //$NON-NLS-1$
			}
		}
	}

	@Override
	public boolean isCommercialFeaturesEnabled() {
		try {
			return ((String) HotspotManagementToolkit.getVMOption(server, VM_FLAG)).contains("true"); //$NON-NLS-1$
		} catch (Exception e) {
			// Commercial Feature option is not available but Flighter Recorder is.
			if (isJfrMBeanAvailable()) {
				return true;
			}
			return false;
		}
	}

	@Override
	public void enableCommercialFeatures() throws Exception {
		if (dcs != null) {
			dcs.runCtrlBreakHandlerWithResult(UNLOCK_COMMAND);
		}
		if (!isCommercialFeaturesEnabled()) {
			HotspotManagementToolkit.setVMOption(server, VM_FLAG, "true"); //$NON-NLS-1$
		}
	}

	private boolean isJfrMBeanAvailable() {
		try {
			getJfrMBeanObjectName();
			return true;
		} catch (Exception e) {
			return false;
		}
	}

	private ObjectName getJfrMBeanObjectName() throws Exception {
		ObjectName candidateObjectName = ConnectionToolkit.createObjectName(JFR2_MBEAN_OBJECT_NAME);
		server.getMBeanInfo(candidateObjectName);
		return candidateObjectName;
	}
}