Facade + Strategy 应用

参考文档：

1.设计模式书籍；

在学习Facade模式的时候，已知应用中，说到了：

Choices操作系统[CIRM93]使用facade模式将多个框架组合到一起。Choices中的关键抽象是进程( process )、存储( storage )和地址空间(address space)。每个抽象有一个相应的子系统，用框架实现，支持Choices系统在不同的硬件平台之间移植。其中的两个子系统有“代表”（也就是facade），这两个代表分别是存储( FileSystemInterface )和地址空间( Domain )。

MemoryObjectCache将MemoryObject数据缓存在物理存储器中。MemoryObjectCache实际上是一个Strategy(5.9)模式，由它定位缓存策略。

于是，根据上图，实现这个Facade + Strategy模式的案例

代码实现，（对于具体的业务逻辑没有深入研究，欢迎拍砖）：

Process.java:

package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class Process {    public static void main(String[] args) {        Domain domain = new Domain();        Address address = new Address((byte) 0x0001);        Memory memory = new Memory(address);        domain.add(memory, address);        domain.remove(memory);    }}

Domain.java:

package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class Domain {    private AddressTranslation mAddressTranslation;    private MemoryObject mMemoryObject;    private MemoryObjectCache mMemoryObjectCache;    public Domain() {        this.mAddressTranslation = new TwoLevelPageTable();        this.mMemoryObject = new PersistentStore();        this.mMemoryObjectCache = new PagedMemoryObjectCache();    }    public void add(Memory memory, Address address) {        mAddressTranslation.findMemory(address);        mMemoryObject.buildCache(address);    }    public void remove(Memory memory) {        mAddressTranslation.findMemory(memory.getAddress());        mMemoryObject.remove(memory.getAddress());    }    public void protect(Memory memory, Protection protection) {    }    public void RepairFault() {    }}
AddressTranslation.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public abstract class AddressTranslation {public abstract Memory findMemory(Address address);}
TwoLevelPageTable.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class TwoLevelPageTable extends AddressTranslation {    @Override    public Memory findMemory(Address address) {        return new Memory(address);    }}
MemoryObject.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public abstract class MemoryObject {    public abstract void buildCache(Address address);    public abstract void remove(Address address);}
PersistentStore.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class PersistentStore extends MemoryObject {    @Override    public void buildCache(Address address) {        MemoryObjectCache memoryObjectCache = new PagedMemoryObjectCache();        memoryObjectCache.cache(address);    }    @Override    public void remove(Address address){    }}
Disk.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class Disk extends PersistentStore {    @Override    public void buildCache(Address address) {        super.buildCache(address);    }    @Override    public void remove(Address address) {    }}
File.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class File extends PersistentStore  {    @Override    public void buildCache(Address address) {        super.buildCache(address);    }    @Override    public void remove(Address address) {    }}
MemoryObjectCache.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public abstract class MemoryObjectCache {    public abstract void cache(Address address);}
PagedMemoryObjectCache.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class PagedMemoryObjectCache extends MemoryObjectCache {    @Override    public void cache(Address address) {    }}
Address.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class Address {    private byte mByte = 0x00010;    public Address(byte mByte) {        this.mByte = mByte;    }    public byte getmByte() {        return mByte;    }    public void setmByte(byte mByte) {        this.mByte = mByte;    }}
Memory.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class Memory {    private Address address;    public Memory(Address address) {        this.address = address;    }    public Address getAddress() {        return address;    }    public void setAddress(Address address) {        this.address = address;    }}
Process.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class Process {    public static void main(String[] args) {        Domain domain = new Domain();        Address address = new Address((byte) 0x0001);        Memory memory = new Memory(address);        domain.add(memory, address);        domain.remove(memory);    }}
Protection.java:
package com.rick.designpattern.facade2strategy;/** * Created by MyPC on 2017/6/6. */public class Protection {}