org.apache.aurora.scheduler.storage.db.DbAttributeStore.java Source code

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Here is the source code for org.apache.aurora.scheduler.storage.db.DbAttributeStore.java

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/**
 * 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 org.apache.aurora.scheduler.storage.db;

import java.util.Objects;
import java.util.Set;

import com.google.common.base.Optional;
import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;
import com.google.inject.Inject;

import org.apache.aurora.scheduler.storage.AttributeStore;
import org.apache.aurora.scheduler.storage.entities.IAttribute;
import org.apache.aurora.scheduler.storage.entities.IHostAttributes;

import static com.google.common.base.Preconditions.checkArgument;

import static org.apache.aurora.common.base.MorePreconditions.checkNotBlank;
import static org.apache.aurora.common.inject.TimedInterceptor.Timed;

/**
 * Attribute store backed by a relational database.
 */
class DbAttributeStore implements AttributeStore.Mutable {

    private final AttributeMapper mapper;

    @Inject
    DbAttributeStore(AttributeMapper mapper) {
        this.mapper = Objects.requireNonNull(mapper);
    }

    @Override
    public void deleteHostAttributes() {
        mapper.truncate();
    }

    @Timed("attribute_store_save")
    @Override
    public boolean saveHostAttributes(IHostAttributes hostAttributes) {
        checkNotBlank(hostAttributes.getHost());
        checkArgument(hostAttributes.isSetMode());

        if (Iterables.any(hostAttributes.getAttributes(), EMPTY_VALUES)) {
            throw new IllegalArgumentException("Host attributes contains empty values: " + hostAttributes);
        }

        Optional<IHostAttributes> existing = getHostAttributes(hostAttributes.getHost());
        if (existing.equals(Optional.of(hostAttributes))) {
            return false;
        } else if (existing.isPresent()) {
            mapper.updateHostModeAndSlaveId(hostAttributes.getHost(), hostAttributes.getMode(),
                    hostAttributes.getSlaveId());
        } else {
            mapper.insert(hostAttributes);
        }

        mapper.deleteAttributeValues(hostAttributes.getHost());
        if (!hostAttributes.getAttributes().isEmpty()) {
            mapper.insertAttributeValues(hostAttributes);
        }

        return true;
    }

    private static final Predicate<IAttribute> EMPTY_VALUES = attribute -> attribute.getValues().isEmpty();

    @Timed("attribute_store_fetch_one")
    @Override
    public Optional<IHostAttributes> getHostAttributes(String host) {
        return Optional.fromNullable(mapper.select(host)).transform(IHostAttributes::build);
    }

    @Timed("attribute_store_fetch_all")
    @Override
    public Set<IHostAttributes> getHostAttributes() {
        return IHostAttributes.setFromBuilders(mapper.selectAll());
    }
}