org.petalslink.dsb.registry.RegistryImpl.java Source code

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Here is the source code for org.petalslink.dsb.registry.RegistryImpl.java

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/**
 * PETALS - PETALS Cloud Platform.
 * Copyright (c) 2012 EBM Websourcing, http://www.ebmwebsourcing.com/
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package org.petalslink.dsb.registry;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;

import javax.xml.namespace.QName;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

/**
 * @author chamerling
 * 
 */
public class RegistryImpl implements Registry<String> {

    /**
     * Key is ITF QName as String
     */
    LoadingCache<String, List<String>> itfs;

    LoadingCache<String, List<String>> srvItf;

    LoadingCache<String, List<String>> srvEpItf;

    private final RegistryEntryLoader loader;

    /**
     * Entry Time To Live. Will be deleted from the cache after ttl seconds.
     */
    private long ttl;

    /**
     * 
     */
    public RegistryImpl(final RegistryEntryLoader loader, long ttl) {
        this.loader = loader;
        this.ttl = ttl;

        itfs = CacheBuilder.newBuilder().expireAfterAccess(this.ttl, TimeUnit.SECONDS)
                .build(new CacheLoader<String, List<String>>() {

                    @Override
                    public List<String> load(String key) throws Exception {
                        return RegistryImpl.this.loader.getByInterface(key);
                    }
                });

        srvItf = CacheBuilder.newBuilder().expireAfterAccess(this.ttl, TimeUnit.SECONDS)
                .build(new CacheLoader<String, List<String>>() {

                    @Override
                    public List<String> load(String key) throws Exception {
                        return RegistryImpl.this.loader.getByServiceInterface(key);
                    }
                });

        srvEpItf = CacheBuilder.newBuilder().expireAfterAccess(this.ttl, TimeUnit.SECONDS)
                .build(new CacheLoader<String, List<String>>() {

                    @Override
                    public List<String> load(String key) throws Exception {
                        return RegistryImpl.this.loader.getByServiceInterfaceEndpoint(key);
                    }
                });
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.petalslink.dsb.registry.Registry#get(java.lang.String,
     * javax.xml.namespace.QName, javax.xml.namespace.QName)
     */
    public List<String> get(String endpoint, QName service, QName itf) {
        String key = toKey(endpoint, service, itf);

        if (endpoint != null && service != null && itf != null) {
            try {
                return srvEpItf.get(key);
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        } else if (service != null && itf != null) {
            try {
                return srvItf.get(key);
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        } else if (itf != null) {
            try {
                return itfs.get(key);
            } catch (ExecutionException e) {
                e.printStackTrace();
            }
        }
        return new ArrayList<String>();
    }

    private String toKey(String endpoint, QName service, QName itf) {
        StringBuilder sb = new StringBuilder();
        if (endpoint != null) {
            sb.append(endpoint);
        }
        if (service != null) {
            sb.append(service.toString());

        }
        if (itf != null) {
            sb.append(itf.toString());
        }
        return sb.toString();
    }

}