/*
* Copyright 2009 VoidSearch.com
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.voidsearch.voidbase.supervision;
import com.voidsearch.voidbase.storage.SupervisedStorage;
import com.voidsearch.voidbase.storage.StorageOperation;
import com.voidsearch.voidbase.storage.StorageException;
public class ConservativeSupervisionStrategy implements SupervisionStrategy {
public void supervise(SupervisedStorage storage, StorageStats stats) throws SupervisionException {
try {
long memory = stats.getCounter(StorageStats.Counter.MEMORY_USAGE);
if (memory < -100) {
storage.blockOperation(StorageOperation.PUT);
}
else if (stats.getState() == StorageStats.State.MINOR) {
storage.enableOperation(StorageOperation.PUT);
}
} catch (StorageException e) {
throw new SupervisionException();
}
}
}