org.apache.gobblin.data.management.retention.policy.PredicateRetentionPolicy.java Source code

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Here is the source code for org.apache.gobblin.data.management.retention.policy.PredicateRetentionPolicy.java

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/*
 * 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.apache.gobblin.data.management.retention.policy;

import java.lang.reflect.InvocationTargetException;
import java.util.Collection;
import java.util.List;
import java.util.Properties;

import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;

import org.apache.gobblin.data.management.retention.version.DatasetVersion;

/**
 * Implementation of {@link RetentionPolicy} that marks a {@link DatasetVersion} for deletion if it does not pass a
 * specified {@link Predicate}. The {@link Predicate} class is determined by the key
 * {@link #RETENTION_POLICY_PREDICATE_CLASS}.
 */
public class PredicateRetentionPolicy implements RetentionPolicy<DatasetVersion> {

    private final Predicate<DatasetVersion> predicate;

    private static final String RETENTION_POLICY_PREDICATE_CLASS = "org.apache.gobblin.retention.retention.policy.predicate.class";

    @SuppressWarnings("unchecked")
    public PredicateRetentionPolicy(Properties props)
            throws InstantiationException, IllegalAccessException, ClassNotFoundException, IllegalArgumentException,
            SecurityException, InvocationTargetException, NoSuchMethodException {
        this.predicate = (Predicate<DatasetVersion>) Class
                .forName(props.getProperty(RETENTION_POLICY_PREDICATE_CLASS)).getConstructor(Properties.class)
                .newInstance(props);
    }

    @Override
    public Class<? extends DatasetVersion> versionClass() {
        return DatasetVersion.class;
    }

    @Override
    public Collection<DatasetVersion> listDeletableVersions(List<DatasetVersion> allVersions) {
        return Lists.newArrayList(Iterables.filter(allVersions, Predicates.not(this.predicate)));
    }
}