StubMapImpl.java

/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 2.1 of the License, or (at your option)
 * any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

package com.liferay.portal.nio.intraband.proxy;

import com.liferay.portal.kernel.nio.intraband.RegistrationReference;
import com.liferay.portal.kernel.resiliency.spi.SPI;
import com.liferay.portal.kernel.resiliency.spi.SPIRegistryUtil;
import com.liferay.portal.nio.intraband.proxy.StubHolder.StubCreator;

import java.rmi.RemoteException;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

/**
 * @author Shuyang Zhou
 */
public class StubMapImpl<T>
	extends ConcurrentHashMap<String, T> implements StubMap<T> {

	public StubMapImpl(StubCreator<T> stubCreator) {
		_stubCreator = stubCreator;
	}

	@Override
	public T get(Object key) {
		String portletId = String.valueOf(key);

		StubHolder<T> stubHolder = _stubHolders.get(portletId);

		if (stubHolder != null) {
			return stubHolder.getStub();
		}

		T originalValue = super.get(key);

		if (originalValue == null) {
			return null;
		}

		RegistrationReference registrationReference = _getRegistrationReference(
			portletId);

		if (registrationReference == null) {
			return originalValue;
		}

		stubHolder = new StubHolder<>(
			originalValue, portletId, registrationReference, _stubCreator);

		StubHolder<T> previousStubHolder = _stubHolders.putIfAbsent(
			portletId, stubHolder);

		if (previousStubHolder != null) {
			stubHolder = previousStubHolder;
		}

		return stubHolder.getStub();
	}

	@Override
	public boolean removeStubHolder(String portletId, T stub) {
		return _stubHolders.remove(portletId, stub);
	}

	private RegistrationReference _getRegistrationReference(String portletId) {
		SPI spi = SPIRegistryUtil.getPortletSPI(portletId);

		if (spi == null) {
			return null;
		}

		try {
			return spi.getRegistrationReference();
		}
		catch (RemoteException re) {
			throw new RuntimeException(re);
		}
	}

	private final StubCreator<T> _stubCreator;
	private final ConcurrentMap<String, StubHolder<T>> _stubHolders =
		new ConcurrentHashMap<>();

}