org.jclouds.karaf.services.ServiceFactorySupport Maven / Gradle / Ivy

Go to download
/*
 * Copyright (C) 2011, the original authors
 *
 * ====================================================================
 * 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 at
 *
 * 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 org.jclouds.karaf.services;

import org.jclouds.apis.ApiMetadata;
import org.jclouds.providers.ProviderMetadata;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.cm.ConfigurationException;
import org.osgi.service.cm.ManagedServiceFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Dictionary;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;

public abstract class ServiceFactorySupport implements ManagedServiceFactory {

    private static final Logger LOGGER = LoggerFactory.getLogger(ComputeServiceFactory.class);

    public static final String PROVIDER = "provider";
    public static final String API = "api";
    public static final String ENDPOINT = "endpoint";
    public static final String IDENTITY = "identity";
    public static final String CREDENTIAL = "credential";


    protected final Map registrations = new ConcurrentHashMap();

    protected final Map pendingPids = new HashMap();
    protected final Map activePids = new HashMap();

    protected final Map providerPids = new HashMap();
    protected final Map apiPids = new HashMap();
    protected final Map installedProviders = new HashMap();
    protected final Map installedApis = new HashMap();

    protected final ReentrantLock lock = new ReentrantLock();

    public void deleted(String pid) {
        ServiceRegistration oldRegistration = registrations.remove(pid);
        if (oldRegistration != null) {
            oldRegistration.unregister();
        }
    }

    public void providerInstalled(ProviderMetadata provider) {
        try {
            lock.tryLock();
            installedProviders.put(provider.getId(), provider);
            //Check if there is a pid that requires the installed provider.
            String pid = providerPids.get(provider.getId());
            if (pid != null && pendingPids.containsKey(pid) ) {
                Dictionary properties = pendingPids.get(pid);
                try {
                    updated(pid, properties);
                } catch (ConfigurationException e) {
                    LOGGER.error("Error while installing service for pending provider " + provider + " with pid " + pid, e);
                }
            }
        } finally {
            if (lock.isHeldByCurrentThread()) {
                lock.unlock();
            }
        }
    }


    public void providerUninstalled(ProviderMetadata provider) {
        try {
            lock.tryLock();
            String pid = providerPids.get(provider.getId());
            if (pid != null) {
                if (activePids.containsKey(pid)) {
                    pendingPids.put(pid, activePids.remove(pid));
                }
                deleted(pid);
            }
            installedProviders.remove(provider.getId());
        } finally {
            if (lock.isHeldByCurrentThread()) {
                lock.unlock();
            }
        }
    }

    public void apiInstalled(ApiMetadata api) {
        try {
            lock.tryLock();
            installedApis.put(api.getId(), api);
            //Check if there is a pid that requires the installed provider.
            String pid = apiPids.get(api.getId());
            if (pid != null && pendingPids.containsKey(pid)) {
                Dictionary properties = pendingPids.get(pid);
                try {
                    updated(pid, properties);
                } catch (ConfigurationException e) {
                    LOGGER.error("Error while installing service for pending api " + api + " with pid " + pid, e);
                }
            }
        } finally {
            if (lock.isHeldByCurrentThread()) {
                lock.unlock();
            }
        }
    }

    public void apiUninstalled(ApiMetadata api) {
        try {
            lock.tryLock();
            String pid = apiPids.get(api.getId());
            if (pid != null) {
                if (activePids.containsKey(pid)) {
                    pendingPids.put(pid, activePids.remove(pid));
                }
                deleted(pid);
            }
            installedApis.remove(api.getId());
        } finally {
            if (lock.isHeldByCurrentThread()) {
                lock.unlock();
            }
        }
    }

    public Map getInstalledProviders() {
        return installedProviders;
    }

    public Map getInstalledApis() {
        return installedApis;
    }

}