MavenWrapperManager.java

/*******************************************************************************
 * Copyright (c) 2012-2017 Codenvy, S.A.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *   Codenvy, S.A. - initial API and implementation
 *******************************************************************************/
package org.eclipse.che.plugin.maven.server;

import com.google.inject.Inject;
import com.google.inject.Singleton;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;

/**
 *
 * Manages and cache MavenServerWrapper instances
 *
 * @author Evgen Vidolob
 */
@Singleton
public class MavenWrapperManager {


    private final MavenServerManager    serverManager;
    private final Map<ServerType, MavenServerWrapper> cache = new HashMap<>();
    private final Set<MavenServerWrapper> usedServers = new HashSet<>();


    @Inject
    public MavenWrapperManager(MavenServerManager serverManager) {
        this.serverManager = serverManager;
    }

    public synchronized MavenServerWrapper getMavenServer(ServerType type) {
        MavenServerWrapper wrapper = cache.get(type);
        if (wrapper == null) {
            wrapper = serverManager.createMavenServer();
            cache.put(type, wrapper);
        }

        if (usedServers.contains(wrapper)) {
            //need to warn here
            return serverManager.createMavenServer();
        }

        usedServers.add(wrapper);
        return wrapper;
    }

    public synchronized void release(MavenServerWrapper wrapper) {
        if (usedServers.contains(wrapper)) {
            wrapper.reset();
            usedServers.remove(wrapper);
        } else {
            wrapper.dispose();
        }
    }

    public enum ServerType {
        RESOLVE, DOWNLOAD
    }
}