gobblin.qualitychecker.task.TaskLevelPolicyCheckerBuilder.java Source code

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Here is the source code for gobblin.qualitychecker.task.TaskLevelPolicyCheckerBuilder.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 gobblin.qualitychecker.task;

import gobblin.configuration.ConfigurationKeys;
import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.base.Splitter;
import com.google.common.collect.Lists;

import gobblin.configuration.State;
import gobblin.util.ForkOperatorUtils;

/**
 * Creates a PolicyChecker and initializes the PolicyList
 * the list is Policies to create is taken from the
 * MetadataCollector
 */
public class TaskLevelPolicyCheckerBuilder {
    private final State state;
    private final int index;

    private static final Logger LOG = LoggerFactory.getLogger(TaskLevelPolicyCheckerBuilder.class);

    public TaskLevelPolicyCheckerBuilder(State state, int index) {
        this.state = state;
        this.index = index;
    }

    @SuppressWarnings("unchecked")
    private List<TaskLevelPolicy> createPolicyList() throws Exception {
        List<TaskLevelPolicy> list = new ArrayList<>();
        String taskLevelPoliciesKey = ForkOperatorUtils
                .getPropertyNameForBranch(ConfigurationKeys.TASK_LEVEL_POLICY_LIST, this.index);
        String taskLevelPolicyTypesKey = ForkOperatorUtils
                .getPropertyNameForBranch(ConfigurationKeys.TASK_LEVEL_POLICY_LIST_TYPE, this.index);
        if (this.state.contains(taskLevelPoliciesKey) && this.state.contains(taskLevelPolicyTypesKey)) {
            Splitter splitter = Splitter.on(",").omitEmptyStrings().trimResults();
            List<String> policies = Lists.newArrayList(splitter.split(this.state.getProp(taskLevelPoliciesKey)));
            List<String> types = Lists.newArrayList(splitter.split(this.state.getProp(taskLevelPolicyTypesKey)));
            if (policies.size() != types.size()) {
                throw new Exception("TaskLevelPolicy list and TaskLevelPolicies type list are not the same length");
            }
            for (int i = 0; i < policies.size(); i++) {
                try {
                    Class<? extends TaskLevelPolicy> policyClass = (Class<? extends TaskLevelPolicy>) Class
                            .forName(policies.get(i));
                    Constructor<? extends TaskLevelPolicy> policyConstructor = policyClass
                            .getConstructor(State.class, TaskLevelPolicy.Type.class);
                    TaskLevelPolicy policy = policyConstructor.newInstance(this.state,
                            TaskLevelPolicy.Type.valueOf(types.get(i)));
                    list.add(policy);
                } catch (Exception e) {
                    LOG.error(taskLevelPoliciesKey + " contains a class " + policies.get(i)
                            + " which doesn't extend Policy.", e);
                    throw e;
                }
            }
        }
        return list;
    }

    public static TaskLevelPolicyCheckerBuilder newBuilder(State state, int index) {
        return new TaskLevelPolicyCheckerBuilder(state, index);
    }

    public TaskLevelPolicyChecker build() throws Exception {
        return new TaskLevelPolicyChecker(createPolicyList());
    }
}