/*
* Licensed to the Apache Software Foundation (ASF) under one 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.jclouds.openstack.nova.v2_0.compute.loaders;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static org.jclouds.openstack.nova.v2_0.config.NovaProperties.TIMEOUT_SECURITYGROUP_PRESENT;
import java.util.concurrent.atomic.AtomicReference;
import javax.inject.Inject;
import javax.inject.Named;
import org.jclouds.openstack.nova.v2_0.domain.zonescoped.SecurityGroupInZone;
import org.jclouds.openstack.nova.v2_0.domain.zonescoped.ZoneAndName;
import org.jclouds.openstack.nova.v2_0.domain.zonescoped.ZoneSecurityGroupNameAndPorts;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.cache.CacheLoader;
import com.google.common.util.concurrent.Atomics;
/**
*
* @author Adrian Cole
*/
public class FindSecurityGroupOrCreate extends CacheLoader<ZoneAndName, SecurityGroupInZone> {
protected final Predicate<AtomicReference<ZoneAndName>> returnSecurityGroupExistsInZone;
protected final Function<ZoneSecurityGroupNameAndPorts, SecurityGroupInZone> groupCreator;
@Inject
public FindSecurityGroupOrCreate(
@Named(TIMEOUT_SECURITYGROUP_PRESENT) Predicate<AtomicReference<ZoneAndName>> returnSecurityGroupExistsInZone,
Function<ZoneSecurityGroupNameAndPorts, SecurityGroupInZone> groupCreator) {
this.returnSecurityGroupExistsInZone = checkNotNull(returnSecurityGroupExistsInZone,
"returnSecurityGroupExistsInZone");
this.groupCreator = checkNotNull(groupCreator, "groupCreator");
}
@Override
public SecurityGroupInZone load(ZoneAndName in) {
AtomicReference<ZoneAndName> securityGroupInZoneRef = Atomics.newReference(checkNotNull(in,
"zoneSecurityGroupNameAndPorts"));
if (returnSecurityGroupExistsInZone.apply(securityGroupInZoneRef)) {
return returnExistingSecurityGroup(securityGroupInZoneRef);
} else {
return createNewSecurityGroup(in);
}
}
private SecurityGroupInZone returnExistingSecurityGroup(AtomicReference<ZoneAndName> securityGroupInZoneRef) {
ZoneAndName securityGroupInZone = securityGroupInZoneRef.get();
checkState(securityGroupInZone instanceof SecurityGroupInZone,
"programming error: predicate %s should update the atomic reference to the actual security group found",
returnSecurityGroupExistsInZone);
return SecurityGroupInZone.class.cast(securityGroupInZone);
}
private SecurityGroupInZone createNewSecurityGroup(ZoneAndName in) {
checkState(
checkNotNull(in, "zoneSecurityGroupNameAndPorts") instanceof ZoneSecurityGroupNameAndPorts,
"programming error: when issuing get to this cacheloader, you need to pass an instance of ZoneSecurityGroupNameAndPorts, not %s",
in);
ZoneSecurityGroupNameAndPorts zoneSecurityGroupNameAndPorts = ZoneSecurityGroupNameAndPorts.class.cast(in);
return groupCreator.apply(zoneSecurityGroupNameAndPorts);
}
@Override
public String toString() {
return "returnExistingSecurityGroupInZoneOrCreateAsNeeded()";
}
}