epoxide.lpa.impl.memcachedb.MemcacheRecordSet.java Source code

Introduction

Here is the source code for epoxide.lpa.impl.memcachedb.MemcacheRecordSet.java

Source

/*
   Copyright 2014 Simon Schmidt
    
   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 epoxide.lpa.impl.memcachedb;

import com.google.common.hash.Hashing;

import net.spy.memcached.MemcachedClient;
import epoxide.lpa.IterableIterator;
import epoxide.lpa.RecordSet;
import epoxide.lpa.impl.Empty;
import epoxide.lpa.impl.Serializer;
import epoxide.lpa.impl.StringUtil;

public class MemcacheRecordSet<T> implements RecordSet<T> {
    private Class<T> cls;
    private RecordData recdata;
    private MemcachedClient client;

    public MemcacheRecordSet(Class<T> cls, RecordData recdata, MemcachedClient client) {
        super();
        this.cls = cls;
        this.recdata = recdata;
        this.client = client;
    }

    private String toKey(Object id) {
        return recdata.name + ">" + StringUtil.hash(Hashing.murmur3_128(), Serializer.INSTANCE.kryo(), id);
    }

    @Override
    public T getEntity(Object id) {
        String k = toKey(id);
        return cls.cast(client.get(k, recdata.transcoder));
    }

    @Override
    public IterableIterator<T> getEntities() {
        return new Empty<T>();
    }

    @Override
    public void insert(T record) {
        String key = toKey(recdata.key.get(record));
        if (client.get(key) != null)
            return;
        client.set(key, Integer.MAX_VALUE, record, recdata.transcoder);
    }

    @Override
    public void update(T record) {
        String key = toKey(recdata.key.get(record));
        if (client.get(key) == null)
            return;
        client.set(key, Integer.MAX_VALUE, record, recdata.transcoder);
    }

    @Override
    public void put(T record) {
        String key = toKey(recdata.key.get(record));
        client.set(key, Integer.MAX_VALUE, record, recdata.transcoder);
    }

    @Override
    public void delete(T record) {
        client.delete(toKey(recdata.key.get(record)));
    }
}