Apache の (便利な) org.apache.commons.pool.impl.commmons.pool.GenericObjectPool.addObject() が例外をスローするように宣言されている正当な理由はありますか?
実際、org.apache.commons.pool.BaseObjectPool は、org.apache.commons.pool インターフェースから次のように宣言します。
/**
* Create an object using the {@link PoolableObjectFactory factory} or other
* implementation dependent mechanism, passivate it, and then place it in the idle object pool.
* <code>addObject</code> is useful for "pre-loading" a pool with idle objects.
* (Optional operation).
*
* @throws Exception when {@link PoolableObjectFactory#makeObject} fails.
* @throws IllegalStateException after {@link #close} has been called on this pool.
* @throws UnsupportedOperationException when this pool cannot add new idle objects.
*/
void addObject() throws Exception, IllegalStateException, UnsupportedOperationException;
なぜRuntimeExceptionの派生物ではないのでしょうか?
/**
* Create an object, and place it into the pool.
* addObject() is useful for "pre-loading" a pool with idle objects.
*/
@Override
public void addObject() throws Exception {
assertOpen();
if (_factory == null) {
throw new IllegalStateException("Cannot add objects without a factory.");
}
T obj = _factory.makeObject();
try {
assertOpen();
addObjectToPool(obj, false);
} catch (IllegalStateException ex) { // Pool closed
try {
_factory.destroyObject(obj);
} catch (Exception ex2) {
// swallow
}
throw ex;
}
}