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package com.sun.enterprise.admin.wsmgmt.pool.impl;
import java.util.Collection;
import java.util.Collections;
import java.util.Map;
import java.util.HashMap;
import java.util.List;
import java.util.ArrayList;
import com.sun.enterprise.admin.wsmgmt.pool.spi.Pool;
/**
* Pool used to keep track of SOAP messages. This implementation of
* the pool keeps a fixed amount of entries in the pool. If pool
* size exceeds the max allowed entry, the oldest entry is removed from
* the pool.
*/
public class BoundedPool implements Pool{
/**
* Constructor.
*
* @param name name of the pool
*/
public BoundedPool(String name) {
_name = name;
_keyList = Collections.synchronizedList(new ArrayList());
_map = new HashMap();
}
/**
* Constructor.
*
* @param name name of the pool
* @param size max size of the pool
*/
public BoundedPool(String name, int size) {
this(name);
_maxSizeAllowed = size;
}
/**
* Returns the object for the given key.
*
* @param key key used to put objects in the pool
*
* @return object for the given key or null
*/
public Object get(Object key) {
return _map.get(key);
}
/**
* Adds the object to the pool. If pool size is greater
* than the max allowed, the oldest entry is removed
* from the pool.
*
* @param key key used to put this object
* @param val actual object to be added to the pool
*
* @return previous value for this key or null
*/
public Object put(Object key, Object val) {
if ((key == null) && (val == null)) {
throw new IllegalArgumentException();
}
Object oldVal = null;
synchronized (this) {
oldVal = _map.put(key, val);
_keyList.add(key);
// remove the extra entry from the pool
if (_keyList.size() > _maxSizeAllowed) {
Object rkey = _keyList.remove(0);
assert (rkey != null);
Object rval = _map.remove(rkey);
assert (rval != null);
}
}
return oldVal;
}
/**
* Removes this keyed entry from the pool.
*
* @param key key of the entry that is targeted to be removed
*
* @return removed entry or null if key not found
*/
public Object remove(Object key) {
Object val = null;
synchronized (this) {
_keyList.remove(key);
val = _map.remove(key);
}
return val;
}
/**
* Removes all mappings from this pool.
*/
public void clear() {
synchronized (this) {
_map.clear();
_keyList.clear();
}
}
/**
* Returns the number of mappings in this pool.
*
* @return current number of mappings in this pool
*/
public int size() {
return _map.size();
}
/**
* Returns the maximum number of mappings allowed in this pool.
*
* @return max number of mappings allowed
*/
public int getMaxSize() {
return _maxSizeAllowed;
}
/**
* Returns true if this pool contains mapping for the specified key.
*
* @param key the presence of the key to be tested
*
* @return true if this pool contains mapping for the specified key
*/
public boolean containsKey(Object key) {
return _map.containsKey(key);
}
/**
* Returns true if this pool contains mapping for the specified value.
*
* @param val the presence of the value to be tested
*
* @return true if this pool contains mapping for the specified value
*/
public boolean containsValue(Object val) {
return _map.containsValue(val);
}
/**
* Returns a collection view of the values contained in this pool.
*
* @return a collection view of the values contained in this pool
*/
public Collection values() {
return _map.values();
}
/**
* Resets the max size of the pool. If new size is less than current
* size, all extra entries in the pool are removed.
*
* @param size new max size of the pool
*/
public void resize(int size) {
if (size < 1) {
return;
}
if (size == _maxSizeAllowed) {
// do nothing
} else if (size > _maxSizeAllowed) {
synchronized (this) {
_maxSizeAllowed = size;
}
} else {
// remove the extra entries from the pool
synchronized (this) {
int currentSize = _map.size();
int diff = currentSize - size;
// remove extra entries if current size is bigger than diff
for (int i=0; i<diff; i++) {
Object key = _keyList.get(i);
assert (key != null);
if (key != null) {
Object val = _map.remove(key);
assert (val != null);
}
}
for(int i=0; i <diff; i++) {
_keyList.remove(0);
}
_maxSizeAllowed = size;
}
}
}
/**
* Returns the name of the pool.
*
* @return name of the pool
*/
public String getName() {
return _name;
}
// ---- INSTANCE VARIABLES - PRIVATE -------------------------
private List _keyList = null;
private Map _map = null;
private String _name = null;
private int _maxSizeAllowed = 25;
}
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