Revision 2100 org.gvsig.tools/library/trunk/org.gvsig.tools/org.gvsig.tools.lib/src/main/java/org/gvsig/tools/util/CachedValue.java
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/** |
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* gvSIG. Desktop Geographic Information System. |
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* |
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* Copyright (C) 2007-2013 gvSIG Association.
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* Copyright (C) 2007-2020 gvSIG Association.
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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*/ |
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package org.gvsig.tools.util; |
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import java.io.Closeable; |
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import java.io.IOException; |
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import org.gvsig.tools.dispose.Disposable; |
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import org.gvsig.tools.dispose.DisposeUtils; |
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/** |
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* |
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* @author jjdelcerro |
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*/ |
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public abstract class CachedValue<T> {
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T value = null; |
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long lastAccess = 0; |
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long expireTimeInMillis; |
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private T value = null;
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private long lastAccess = 0;
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private long expireTimeInMillis;
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public CachedValue() {
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this(3000); |
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this.expireTimeInMillis = expireTimeInMillis; |
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} |
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protected abstract void reload(); |
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protected void reload() {
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// Overwrite this method. |
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} |
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public boolean isExpired() {
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protected final T getValue() {
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return this.value; |
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} |
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protected void setValue(T value) {
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this.value = value; |
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} |
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public final boolean isExpired() {
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long now = System.currentTimeMillis(); |
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return (now - lastAccess) > expireTimeInMillis; |
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} |
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public T get() {
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public final void set(T value) {
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this.value = value; |
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lastAccess = System.currentTimeMillis(); |
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} |
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public final void setExpireTime(long expireTimeInMillis) {
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this.expireTimeInMillis = expireTimeInMillis; |
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} |
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public final long getExpireTime() {
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return expireTimeInMillis; |
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} |
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public final void resetAccess() {
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this.lastAccess = System.currentTimeMillis(); |
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} |
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public final void expired() {
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this.lastAccess = 0; |
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} |
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public final T get() {
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if (isExpired()) {
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if( value instanceof Disposable ) {
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DisposeUtils.disposeQuietly((Disposable) value); |
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} else if( value instanceof Closeable ) {
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try {
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((Closeable)value).close(); |
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} catch (IOException ex) {
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// Ignore |
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} |
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} |
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value = null; |
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reload(); |
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} |
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lastAccess = System.currentTimeMillis(); |
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