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// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The ASF licenses this file
// to you 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 org.apache.cloudstack.storage.allocator;

import java.util.List;
import java.util.Map;

import javax.ejb.Local;
import javax.inject.Inject;
import javax.naming.ConfigurationException;

import org.apache.cloudstack.engine.subsystem.api.storage.StoragePoolAllocator;
import org.apache.log4j.Logger;

import com.cloud.configuration.dao.ConfigurationDao;
import com.cloud.deploy.DeploymentPlan;
import com.cloud.deploy.DeploymentPlanner.ExcludeList;
import com.cloud.storage.StorageManager;
import com.cloud.storage.StoragePool;
import com.cloud.utils.component.ComponentContext;
import com.cloud.vm.DiskProfile;
import com.cloud.vm.VirtualMachine;
import com.cloud.vm.VirtualMachineProfile;

@Local(value = StoragePoolAllocator.class)
public class GarbageCollectingStoragePoolAllocator extends AbstractStoragePoolAllocator {
    private static final Logger s_logger = Logger.getLogger(GarbageCollectingStoragePoolAllocator.class);

    StoragePoolAllocator _firstFitStoragePoolAllocator;
    StoragePoolAllocator _localStoragePoolAllocator;
    @Inject
    StorageManager storageMgr;
    @Inject
    ConfigurationDao _configDao;
    boolean _storagePoolCleanupEnabled;

    @Override
    public List<StoragePool> select(DiskProfile dskCh, VirtualMachineProfile<? extends VirtualMachine> vmProfile,
            DeploymentPlan plan, ExcludeList avoid, int returnUpTo) {
        s_logger.debug("GarbageCollectingStoragePoolAllocator looking for storage pool");
        if (!_storagePoolCleanupEnabled) {
            s_logger.debug("Storage pool cleanup is not enabled, so GarbageCollectingStoragePoolAllocator is being skipped.");
            return null;
        }

        // Clean up all storage pools
        storageMgr.cleanupStorage(false);
        // Determine what allocator to use
        StoragePoolAllocator allocator;
        if (dskCh.useLocalStorage()) {
            allocator = _localStoragePoolAllocator;
        } else {
            allocator = _firstFitStoragePoolAllocator;
        }

        // Try to find a storage pool after cleanup
        ExcludeList myAvoids = new ExcludeList(avoid.getDataCentersToAvoid(), avoid.getPodsToAvoid(),
                avoid.getClustersToAvoid(), avoid.getHostsToAvoid(), avoid.getPoolsToAvoid());

        return allocator.allocateToPool(dskCh, vmProfile, plan, myAvoids, returnUpTo);
    }

    @Override
    public boolean configure(String name, Map<String, Object> params) throws ConfigurationException {
        super.configure(name, params);

        _firstFitStoragePoolAllocator = ComponentContext.inject(ClusterScopeStoragePoolAllocator.class);
        _firstFitStoragePoolAllocator.configure("GCFirstFitStoragePoolAllocator", params);
        _localStoragePoolAllocator = ComponentContext.inject(LocalStoragePoolAllocator.class);
        _localStoragePoolAllocator.configure("GCLocalStoragePoolAllocator", params);

        String storagePoolCleanupEnabled = _configDao.getValue("storage.pool.cleanup.enabled");
        _storagePoolCleanupEnabled = (storagePoolCleanupEnabled == null) ? true : Boolean
                .parseBoolean(storagePoolCleanupEnabled);

        return true;
    }

    public GarbageCollectingStoragePoolAllocator() {
    }

}
