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對象池相關

業余時間寫了有關對象池方面的程序,不足之處請大家指出:
1)要放如到對象池中的對象類
package com.test;

import java.util.*;

public class TestObject {
  private String ID;

  private String name;

  private boolean isUsed = false;

  private long firstDate = System.currentTimeMillis();

  public void handle() {// 業務操作 ?????
  }

  public long getFirstDate() {
    return firstDate;
  }

  public void setFirstDate(long firstDate) {
    this.firstDate = firstDate;
  }

  public boolean isUsed() {
    return isUsed;
  }

  public void setUsed(boolean isUsed) {
    this.isUsed = isUsed;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getID() {
    return ID;
  }

  public void setID(String id) {
    ID = id;
  }

  public boolean close() {
   this.setFirstDate(System.currentTimeMillis());
    this.setUsed(false);
    return true;
  }
}
2)對象池類
package com.test;

import java.util.*;

;

public class Factory {
  private static Factory factory;

  private static int minimum = 4;// 對象池中最少有4個對象
  //暫時沒有寫對象池初始化的時候自動生成4個相關對象
  private static int maximum = 10;// 對象池中最多有10個對象

  private static Collection data = new Vector();
  static {
    TestObject testObject = new TestObject();
    /*
* for (int i = 0; i < minimum; i++) { testObject.setID("0" + new Integer Light Bulb

.toString());
* testObject.setName("01" + new Integer Light Bulb

.toString()); data.add(testObject); }
*/
    testObject.setID("01");
    testObject.setName("011");
    data.add(testObject);
    testObject = new TestObject();
    testObject.setID("02");
    testObject.setName("021");
    data.add(testObject);
    testObject = new TestObject();
    testObject.setID("03");
    testObject.setName("031");
    data.add(testObject);
    testObject = new TestObject();
    testObject.setID("04");
    testObject.setName("041");
    data.add(testObject);
    testObject = new TestObject();
    testObject.setID("05");
    testObject.setName("051");
    data.add(testObject);
    testObject = new TestObject();
    testObject.setID("06");
    testObject.setName("061");
    data.add(testObject);
    testObject = new TestObject();
    testObject.setID("07");
    testObject.setName("071");
    data.add(testObject);
  }

  private Factory() {

  }

  public static synchronized Factory creatFactoryPool() {
    if (factory == null)
      factory = new Factory();
    return factory;
  }

  public TestObject getObject(String id) {
    /*
* 通過ID來查找對象
*/
    Iterator iterator = getIterator();
    TestObject object = null;
    int i = 0;
    while (iterator.hasNext()) {
      object = (TestObject) iterator.next();
      if (id.equals(object.getID())) {
        i = 1;
        /*
* 當返回池中對象時,對象的下面2個屬性值做相映的變化
*/
        object.setFirstDate(System.currentTimeMillis());
        object.setUsed(true);
        break;
      }
    }
    if (i == 1) {
      return object;
    } else {
      System.out.println("ID=" + id + "對象不存在!");
      return null;
    }
  }

  public TestObject getObject() {
    /*
* 獲取池中對象,如池中沒有多余對象可供選擇,即返回一新建對象.
* 如池中對象數目沒有達到最大值,就把此對象添加池中.
*/
    Iterator iterator = getIterator();
    TestObject object = null;
    int i = 0;
    while (iterator.hasNext()) {
      object = (TestObject) iterator.next();
      if (object.isUsed() == false) {
        i = 1;
        object.setFirstDate(System.currentTimeMillis());
        object.setUsed(true);
        break;
      }
    }
    if (i == 1) {// 得到要查找的對象
      return object;
    }
    if (data.size() < maximum) {
      System.out.println("返回新建對象,添加池中!");
      object = new TestObject();
      object.setUsed(true);
      data.add(object);
      return object;
    } else {
      System.out.println("返回新建對象!");
      return new TestObject();
    }
  }

  public boolean deleteObject(String id) {
    /*
* 根據對象ID來刪除對象.成功返回true,失敗返回false
*/
    Iterator iterator = getIterator();
    TestObject object = null;
    int i = 0;
    while (iterator.hasNext()) {
      if (object.getID().equals(id)) {
        iterator.remove();
        i = 1;
        break;
      }
    }
    if (i == 0) {
      System.out.println("ID=" + id + "被刪除對象不存在!");
      return false;
    } else {
      System.out.println("刪除對象成功!");
      return true;
    }

  }

  public boolean addObject(TestObject Object) {
    return data.add(Object);

  }

  public void objectManage() {
    /*
     * 池對象在獲取對象時候,都會執行此方法.如果有對象超過30分鐘沒有使用,
     * 就把此對象isUsed屬性值改成false
     */
    long interval = 30 * 60 * 1000;// 30分鐘
    Iterator iterator = data.iterator();
    TestObject object = null;
    long currentTime = System.currentTimeMillis();
    while (iterator.hasNext()) {
      object = (TestObject) iterator.next();
      if (object.isUsed() == false)
        continue;
      if (currentTime - object.getFirstDate() >= interval) {
        object.setUsed(false);
      }
    }
  }

  public Collection getData() {
    return data;
  }

  public Iterator getIterator() {
    objectManage();
    return data.iterator();
  }

}
Factory類提供了獲取對象的相關方法,程序還有不少要改進的地方,貼出來讓大家提出改進的意見!

posted @ 2007-05-10 23:03 二胡閱讀(132) | 評論 (0) | 編輯收藏

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