/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.ignite.ml.math.impls.storage.vector;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.apache.ignite.IgniteCache;
import org.apache.ignite.Ignition;
import org.apache.ignite.ml.math.ValueMapper;
import org.apache.ignite.ml.math.VectorKeyMapper;
import org.apache.ignite.ml.math.VectorStorage;
/**
* Vector storage based on existing cache and index and value mapping functions.
*/
public class CacheVectorStorage<K, V> implements VectorStorage {
/** Storage size. */
private int size;
/** Key mapper. */
private VectorKeyMapper<K> keyMapper;
/** Value mapper. */
private ValueMapper<V> valMapper;
/** Underlying ignite cache. */
private IgniteCache<K, V> cache;
/**
*
*/
public CacheVectorStorage() {
// No-op.
}
/**
* @param size Vector size.
* @param cache Ignite cache.
* @param keyMapper {@link VectorKeyMapper} to validate cache key.
* @param valMapper {@link ValueMapper} to obtain value for given cache key.
*/
public CacheVectorStorage(int size, IgniteCache<K, V> cache, VectorKeyMapper<K> keyMapper,
ValueMapper<V> valMapper) {
assert size > 0;
assert cache != null;
assert keyMapper != null;
assert valMapper != null;
this.size = size;
this.cache = cache;
this.keyMapper = keyMapper;
this.valMapper = valMapper;
}
/**
* @return Ignite cache.
*/
public IgniteCache<K, V> cache() {
return cache;
}
/**
* @return Key mapper to validate cache keys.
*/
public VectorKeyMapper<K> keyMapper() {
return keyMapper;
}
/**
* @return Value mapper to obtain vector element values.
*/
public ValueMapper<V> valueMapper() {
return valMapper;
}
/** {@inheritDoc} */
@Override public int size() {
return size;
}
/** {@inheritDoc} */
@Override public double get(int i) {
return valMapper.toDouble(cache.get(keyMapper.apply(i)));
}
/** {@inheritDoc} */
@Override public void set(int i, double v) {
cache.put(keyMapper.apply(i), valMapper.fromDouble(v));
}
/** {@inheritDoc} */
@Override public void writeExternal(ObjectOutput out) throws IOException {
out.writeInt(size);
out.writeObject(keyMapper);
out.writeObject(valMapper);
out.writeUTF(cache.getName());
}
/** {@inheritDoc} */
@SuppressWarnings("unchecked")
@Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
size = in.readInt();
keyMapper = (VectorKeyMapper<K>)in.readObject();
valMapper = (ValueMapper<V>)in.readObject();
cache = Ignition.localIgnite().getOrCreateCache(in.readUTF());
}
/** {@inheritDoc} */
@Override public boolean isSequentialAccess() {
return false;
}
/** {@inheritDoc} */
@Override public boolean isDense() {
return false;
}
/** {@inheritDoc} */
@Override public boolean isRandomAccess() {
return true;
}
/** {@inheritDoc} */
@Override public boolean isDistributed() {
return true;
}
/** {@inheritDoc} */
@Override public boolean isArrayBased() {
return false;
}
/** {@inheritDoc} */
@Override public int hashCode() {
int res = 1;
res = res * 37 + size();
res = res * 37 + keyMapper.hashCode();
res = res * 37 + valMapper.hashCode();
res = res * 37 + cache.hashCode();
return res;
}
/** {@inheritDoc} */
@Override public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null || getClass() != obj.getClass())
return false;
CacheVectorStorage that = (CacheVectorStorage)obj;
return size == that.size
&& (keyMapper != null ? keyMapper.getClass().equals(that.keyMapper.getClass()) : that.keyMapper == null)
&& (valMapper != null ? valMapper.getClass().equals(that.valMapper.getClass()) : that.valMapper == null)
&& (cache != null ? cache.equals(that.cache) : that.cache == null);
}
}