java设计模式进阶_double-checked-locking
2016-09-01 11:03
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//
//
// Generated by StarUML(tm) Java Add-In
//
// @ Project : Untitled
// @ File Name : Item.java
// @ Date : 2016/9/1
// @ Author :
//
//
public class Item {
public String name;
public int level;
}
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
//
//
// Generated by StarUML(tm) Java Add-In
//
// @ Project : Untitled
// @ File Name : Inventory.java
// @ Date : 2016/9/1
// @ Author :
//
//
public class Inventory {
private int inventorySize;
private List<Item> items;
private Lock lock = new ReentrantLock();
public Inventory(int inventorySize) {
this.inventorySize = inventorySize;
this.items = new ArrayList<>(inventorySize);
}
public List<Item> getItems() {
return items;
}
public boolean addItem(Item item) {
if(items.size() < inventorySize)
{
lock.lock();
try {
if(items.size() < inventorySize)
{
items.add(item);
System.out.println(Thread.currentThread());
return true;
}
} finally{
lock.unlock();
}
}
return false;
}
}
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class App {
public static void main(String[] args) {
final Inventory inventory = new Inventory(300);
ExecutorService executorService = Executors.newFixedThreadPool(3);
for(int i = 0;i < 3; i++)
{
executorService.execute(new Runnable(){
@Override
public void run() {
while(inventory.addItem(new Item()));
System.err.println("inventory list:" + inventory.getItems().size());
}
});
}
}
}
/*
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inventory list:300
inventory list:300
inventory list:300
*/
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