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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.component.provider;
import com.yahoo.component.ComponentId;
import com.yahoo.component.AbstractComponent;
/**
* Superclass for simple freezable components
*
* @author bratseth
*/
public class FreezableSimpleComponent extends AbstractComponent implements Freezable {
/** True when this cannot be changed any more */
private boolean frozen=false;
protected FreezableSimpleComponent(ComponentId id) {
super(id);
}
protected FreezableSimpleComponent() {}
/**
* Freezes this component to prevent further changes. Override this to freeze internal data
* structures and dependent objects. Overrides must call super.
* Calling freeze on an already frozen registry must have no effect.
*/
public synchronized void freeze() { frozen=true; }
/** Returns whether this is currently frozen */
public final boolean isFrozen() { return frozen; }
/** Throws an IllegalStateException if this is frozen */
protected void ensureNotFrozen() {
if (frozen)
throw new IllegalStateException(this + " is frozen and cannot be modified");
}
/** Clones this. The clone will <i>not</i> be frozen */
@Override
public FreezableSimpleComponent clone() {
FreezableSimpleComponent clone=(FreezableSimpleComponent)super.clone();
clone.frozen = false;
return clone;
}
}
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