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/*******************************************************************************
 * Copyright (c) 2006, 2018 IBM Corp. and others
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution and
 * is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following
 * Secondary Licenses when the conditions for such availability set
 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
 * General Public License, version 2 with the GNU Classpath
 * Exception [1] and GNU General Public License, version 2 with the
 * OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 *******************************************************************************/

package org.eclipse.osgi.internal.cds;

import static org.eclipse.osgi.internal.debug.Debug.OPTION_DEBUG_LOADER_CDS;

import java.util.function.Supplier;
import org.eclipse.osgi.framework.log.FrameworkLogEntry;
import org.eclipse.osgi.internal.debug.Debug;
import org.eclipse.osgi.internal.framework.EquinoxContainer;
import org.eclipse.osgi.internal.hookregistry.HookConfigurator;
import org.eclipse.osgi.internal.hookregistry.HookRegistry;
import org.eclipse.osgi.internal.log.EquinoxLogServices;

public class CDSHookConfigurator implements HookConfigurator {

	private static final String REPORT_ERRORS = "j9.cds.reporterrors"; //$NON-NLS-1$
	private static final String DISABLE_CDS = "j9.cds.disable"; //$NON-NLS-1$
	private static final String OLD_CDS_CONFIGURATOR = "com.ibm.cds.CDSHookConfigurator"; //$NON-NLS-1$
	private static final String J9_SHARED_CLASS_HELPER_CLASS = "com.ibm.oti.shared.SharedClassHelperFactory"; //$NON-NLS-1$

	static void print(Debug debug, Supplier msg) {
		if (debug.DEBUG_LOADER_CDS) {
			debug.trace(OPTION_DEBUG_LOADER_CDS, msg.get());
		}
	}
	@Override
	public void addHooks(HookRegistry hookRegistry) {
		Debug debug = hookRegistry.getConfiguration().getDebug();
		boolean disableCDS = Boolean.valueOf(hookRegistry.getConfiguration().getProperty(DISABLE_CDS));
		if (disableCDS) {
			print(debug, () -> "Class sharing is disabled by: " + DISABLE_CDS); //$NON-NLS-1$
			return;
		}
		// check for the external com.ibm.cds system.bundle fragment
		try {
			Class.forName(OLD_CDS_CONFIGURATOR);
			// the old com.ibm.cds fragment is installed; disable build-in one
			print(debug, () -> "Detected old com.ibm.cds fragment."); //$NON-NLS-1$
			return;
		} catch (ClassNotFoundException e) {
			// expected
		}
		try {
			Class.forName(J9_SHARED_CLASS_HELPER_CLASS);
			print(debug, () -> "Found Eclipse OpenJ9 support class: " + J9_SHARED_CLASS_HELPER_CLASS); //$NON-NLS-1$
		} catch (ClassNotFoundException e) {
			print(debug, () -> "Not running on Eclipse OpenJ9."); //$NON-NLS-1$
			boolean reportErrors = Boolean.valueOf(hookRegistry.getConfiguration().getProperty(REPORT_ERRORS));
			// not running on J9
			if (reportErrors) {
				EquinoxContainer container = hookRegistry.getContainer();
				EquinoxLogServices logServices = container.getLogServices();
				logServices.log(EquinoxContainer.NAME, FrameworkLogEntry.WARNING,
						"The J9 Class Sharing Adaptor will not work in this configuration. You are not running on a J9 Java VM.", //$NON-NLS-1$
						null);
			}
			return;
		}
		new CDSHookImpls(debug).registerHooks(hookRegistry);
	}

}