com.hazelcast.internal.serialization.Data Maven / Gradle / Ivy
/*
* Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
*
* 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 com.hazelcast.internal.serialization;
import com.hazelcast.nio.serialization.Serializer;
import com.hazelcast.partition.PartitioningStrategy;
/**
* Data is basic unit of serialization. It stores binary form of an object serialized
* by {@link SerializationService#toData(Object)}.
*/
public interface Data {
/**
* Returns byte array representation of internal binary format.
*
* @return binary data
*/
byte[] toByteArray();
/**
* Returns serialization type of binary form. It's defined by
* {@link Serializer#getTypeId()}
*
* @return serializer type ID
*/
int getType();
/**
* Returns the total size of Data in bytes.
*
* The total size is the size of a byte array to contain the full content of this data object. For example in case
* of an HeapData object, the total size will be the length of the payload.
*
* @return total size
*/
int totalSize();
/**
* Copies the payload contained in the Data to the destination buffer.
*
* The dest byte-buffer needs to be large enough to contain the payload. Otherwise an exception is thrown.
*
* The reason this method exists instead of relying on the {@link #toByteArray()} is the existence of the NativeMemoryData.
* With the NativeMemoryData it would lead to a temporary byte-array. This method prevents this temporary byte-array needing
* to be created.
*
* @param dest to byte-buffer to write to
* @param destPos the position in the destination buffer.
*/
void copyTo(byte[] dest, int destPos);
/**
* Returns size of internal binary data in bytes
*
* @return internal data size
*/
int dataSize();
/**
* Returns approximate heap cost of this Data object in bytes.
*
* @return approximate heap cost
*/
int getHeapCost();
/**
* Returns partition hash calculated for serialized object.
* Partition hash is used to determine partition of a Data and is calculated using
* {@link PartitioningStrategy} during serialization.
*
* If partition hash is not set then standard hashCode() is used.
*
* @return partition hash
* @see com.hazelcast.partition.PartitionAware
* @see PartitioningStrategy
* @see SerializationService#toData(Object, PartitioningStrategy)
*/
int getPartitionHash();
/**
* Returns true if Data has partition hash, false otherwise.
*
* @return true if Data has partition hash, false otherwise.
*/
boolean hasPartitionHash();
/**
* Returns 64-bit hash code for this Data object.
*
* @return 64-bit hash code
*/
long hash64();
/**
* Returns true if this Data is created from a {@link com.hazelcast.nio.serialization.Portable} object,
* false otherwise.
*
* @return true if source object is Portable, false otherwise.
*/
boolean isPortable();
/**
* Returns true if this Data is created from a {@link com.hazelcast.core.HazelcastJsonValue} object,
* false otherwise
*
* @return true if source object is HazelcastJsonValue, false otherwise.
*/
boolean isJson();
}