com.dyuproject.protostuff.runtime.NumericIdStrategy Maven / Gradle / Ivy
//================================================================================
//Copyright (c) 2012, David Yu
//All rights reserved.
//--------------------------------------------------------------------------------
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// 3. Neither the name of protostuff nor the names of its contributors may be used
// to endorse or promote products derived from this software without
// specific prior written permission.
//
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package com.dyuproject.protostuff.runtime;
import java.io.IOException;
import java.lang.reflect.Modifier;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Date;
import java.util.EnumMap;
import java.util.EnumSet;
import java.util.List;
import java.util.Map;
import com.dyuproject.protostuff.ByteString;
import com.dyuproject.protostuff.CollectionSchema;
import com.dyuproject.protostuff.Input;
import com.dyuproject.protostuff.MapSchema;
import com.dyuproject.protostuff.Output;
import com.dyuproject.protostuff.Pipe;
import com.dyuproject.protostuff.Schema;
/**
* Base class for numeric id strategies.
*
* @author David Yu
* @created Mar 28, 2012
*/
public abstract class NumericIdStrategy extends IdStrategy
{
// class ids will be limited to 5 bits (written as the value
// of the key: RuntimeFieldFactory.ID_ARRAY)
// Note that ID_ARRAY is used to write the int ids because the value
// is 15 (ID_ARRAY_MAPPED is 17), which means it only takes 1 byte to
// write.
// This optimization will benefit workloads that have primitive arrays
// (including their boxed types) and arrays that have concrete component
// types (e.g not an interface or abstract class)
// The same rules apply for ID_CLASS_ARRAY and ID_CLASS_ARRAY_MAPPED
// primitive values are 0-7 (first 3 bits)
// the 4th bit is the primitive flag
// limited to 24 ids max
protected static final int CID_BOOL = 0, CID_BYTE = 1, CID_CHAR = 2, CID_SHORT = 3,
CID_INT32 = 4, CID_INT64 = 5, CID_FLOAT = 6, CID_DOUBLE = 7,
CID_STRING = 16, CID_BYTES = 17, CID_BYTE_ARRAY = 18,
CID_BIGDECIMAL = 19, CID_BIGINTEGER = 20,
CID_DATE = 21, CID_OBJECT = 22,
CID_ENUM_SET = 23, CID_ENUM_MAP = 24, CID_ENUM = 25,
CID_COLLECTION = 26, CID_MAP = 27,
CID_POJO = 28, CID_CLASS = 29, CID_DELEGATE = 30;
protected NumericIdStrategy(IdStrategy primaryGroup, int groupId)
{
super(primaryGroup, groupId);
}
protected void writeArrayIdTo(Output output, Class componentType)
throws IOException
{
// shouldn't happen
assert !componentType.isArray();
final RegisteredDelegate rd = getRegisteredDelegate(componentType);
if(rd != null)
{
output.writeUInt32(RuntimeFieldFactory.ID_ARRAY,
(rd.id << 5) | CID_DELEGATE, false);
return;
}
final RuntimeFieldFactory inline =
RuntimeFieldFactory.getInline(componentType);
if(inline != null)
{
output.writeUInt32(RuntimeFieldFactory.ID_ARRAY,
getPrimitiveOrScalarId(componentType, inline.id), false);
}
else if(componentType.isEnum())
{
output.writeUInt32(RuntimeFieldFactory.ID_ARRAY,
getEnumId(componentType), false);
}
else if(Object.class == componentType)
{
output.writeUInt32(RuntimeFieldFactory.ID_ARRAY,
CID_OBJECT, false);
}
else if(Class.class == componentType)
{
output.writeUInt32(RuntimeFieldFactory.ID_ARRAY,
CID_CLASS, false);
}
else if(!componentType.isInterface() &&
!Modifier.isAbstract(componentType.getModifiers()))
{
output.writeUInt32(RuntimeFieldFactory.ID_ARRAY,
getId(componentType), false);
}
else
{
// too many possible interfaces and abstract types that it would be costly
// to index it at runtime (Not all subclasses allow dynamic indexing)
output.writeString(RuntimeFieldFactory.ID_ARRAY_MAPPED,
componentType.getName(), false);
}
}
protected void transferArrayId(Input input, Output output, int fieldNumber,
boolean mapped) throws IOException
{
if(mapped)
input.transferByteRangeTo(output, true, fieldNumber, false);
else
output.writeUInt32(fieldNumber, input.readUInt32(), false);
}
protected Class resolveArrayComponentTypeFrom(Input input, boolean mapped)
throws IOException
{
return mapped ? RuntimeEnv.loadClass(input.readString()) :
resolveClass(input.readUInt32());
}
protected void writeClassIdTo(Output output, Class componentType, boolean array)
throws IOException
{
// shouldn't happen
assert !componentType.isArray();
final int id = array ?
RuntimeFieldFactory.ID_CLASS_ARRAY : RuntimeFieldFactory.ID_CLASS;
final RegisteredDelegate rd = getRegisteredDelegate(componentType);
if(rd != null)
{
output.writeUInt32(id,
(rd.id << 5) | CID_DELEGATE, false);
return;
}
final RuntimeFieldFactory inline =
RuntimeFieldFactory.getInline(componentType);
if(inline != null)
{
output.writeUInt32(id,
getPrimitiveOrScalarId(componentType, inline.id), false);
}
else if(componentType.isEnum())
{
output.writeUInt32(id,
getEnumId(componentType), false);
}
else if(Object.class == componentType)
{
output.writeUInt32(id,
CID_OBJECT, false);
}
else if(Class.class == componentType)
{
output.writeUInt32(id,
CID_CLASS, false);
}
else if(!componentType.isInterface() &&
!Modifier.isAbstract(componentType.getModifiers()))
{
output.writeUInt32(id,
getId(componentType), false);
}
else
{
// too many possible interfaces and abstract types that it would be costly
// to index it at runtime (Not all subclasses allow dynamic indexing)
// mapped class ids are +1 from regular the regular ones
output.writeString(id + 1,
componentType.getName(), false);
}
}
protected void transferClassId(Input input, Output output, int fieldNumber,
boolean mapped, boolean array) throws IOException
{
if(mapped)
input.transferByteRangeTo(output, true, fieldNumber, false);
else
output.writeUInt32(fieldNumber, input.readUInt32(), false);
}
protected Class resolveClassFrom(Input input, boolean mapped,
boolean array) throws IOException
{
return mapped ? RuntimeEnv.loadClass(input.readString()) :
resolveClass(input.readUInt32());
}
private static int getPrimitiveOrScalarId(Class clazz, int id)
{
if(clazz.isPrimitive())
return id - 1;
// if id < 9, its the primitive's boxed type.
return id < 9 ? ((id - 1) | 0x08) : (id + 7);
}
private Class resolveClass(int id)
{
final int type = id & 0x1F;
if(type < 16)
{
final boolean primitive = type < 8;
// first 3 bits
switch(type & 0x07)
{
case CID_BOOL: return primitive ? boolean.class : Boolean.class;
case CID_BYTE: return primitive ? byte.class : Byte.class;
case CID_CHAR: return primitive ? char.class : Character.class;
case CID_SHORT: return primitive ? short.class : Short.class;
case CID_INT32: return primitive ? int.class : Integer.class;
case CID_INT64: return primitive ? long.class : Long.class;
case CID_FLOAT: return primitive ? float.class : Float.class;
case CID_DOUBLE: return primitive ? double.class : Double.class;
default: throw new RuntimeException("Should not happen.");
}
}
switch(type)
{
case CID_STRING: return String.class;
case CID_BYTES: return ByteString.class;
case CID_BYTE_ARRAY: return byte[].class;
case CID_BIGDECIMAL: return BigDecimal.class;
case CID_BIGINTEGER: return BigInteger.class;
case CID_DATE: return Date.class;
case CID_OBJECT: return Object.class;
case CID_ENUM_SET: return EnumSet.class;
case CID_ENUM_MAP: return EnumMap.class;
case CID_ENUM:
return enumClass(id >>> 5);
case CID_COLLECTION:
return collectionClass(id >>> 5);
case CID_MAP:
return mapClass(id >>> 5);
case CID_POJO:
return pojoClass(id >>> 5);
case CID_CLASS:
return Class.class;
case CID_DELEGATE:
return delegateClass(id >>> 5);
}
throw new RuntimeException("Should not happen.");
}
protected abstract RegisteredDelegate getRegisteredDelegate(Class clazz);
protected abstract Class enumClass(int id);
protected abstract Class delegateClass(int id);
protected abstract Class collectionClass(int id);
protected abstract Class mapClass(int id);
protected abstract Class pojoClass(int id);
protected abstract int getEnumId(Class clazz);
protected abstract int getId(Class clazz);
protected static ArrayList newList(int size)
{
List l = Collections.nCopies(size, null);
return new ArrayList(l);
}
protected static void grow(ArrayList list, int size)
{
int previousSize = list.size();
list.ensureCapacity(size);
List l = Collections.nCopies(size - previousSize, null);
list.addAll(l);
}
protected static final class RegisteredDelegate extends HasDelegate
{
public final int id;
RegisteredDelegate(int id, Delegate delegate, IdStrategy strategy)
{
super(delegate, strategy);
this.id = id;
}
}
/**
* Register your pojos/enums/collections/maps/delegates here.
*/
public interface Registry
{
/**
* Collection ids start at 1.
*/
public > Registry registerCollection(
CollectionSchema.MessageFactory factory, int id);
/**
* Map ids start at 1.
*/
public > Registry registerMap(
MapSchema.MessageFactory factory, int id);
/**
* Enum ids start at 1.
*/
public > Registry registerEnum(Class clazz, int id);
/**
* Enum ids start at 1.
*/
public Registry registerEnum(EnumIO eio, int id);
/**
* Pojo ids start at 1.
*/
public Registry registerPojo(Class clazz, int id);
/**
* Pojo ids start at 1.
*/
public Registry registerPojo(Schema schema, Pipe.Schema pipeSchema,
int id);
/**
* If you are sure that you are only using a single implementation of
* your interface/abstract class, then it makes sense to map it directly
* to its impl class to avoid writing the type.
*
* Note that the type is always written when your field is
* {@link java.lang.Object}.
*
* Pojo ids start at 1.
*/
public Registry mapPojo(Class baseClass, Class implClass);
/**
* Register a {@link Delegate} and assign an id.
*
* Delegate ids start at 1.
*/
public Registry registerDelegate(Delegate delegate, int id);
}
}
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