com.bazaarvoice.emodb.job.util.JobStatusUtil Maven / Gradle / Ivy

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package com.bazaarvoice.emodb.job.util;

import com.bazaarvoice.emodb.common.json.JsonHelper;
import com.bazaarvoice.emodb.job.api.JobStatus;
import com.bazaarvoice.emodb.job.api.JobType;
import com.fasterxml.jackson.core.type.TypeReference;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.inject.util.Types;

import java.lang.reflect.Type;

/**
 * Utility class for handling JobStatus object in a type-safe manner.
 */
abstract public class JobStatusUtil {

    /**
     * Optimization to perform narrowing of JobStatus objects by caching their TypeReferences based on the JobType.
     */
    private static final LoadingCache, TypeReference>> _jobStatusTypeReferences =
            CacheBuilder.newBuilder()
                    .build(new CacheLoader, TypeReference>>() {
                        @Override
                        public TypeReference> load(final JobType jobType)
                                throws Exception {
                            return new TypeReference>() {
                                private Type _type = Types.newParameterizedType(
                                        JobStatus.class, jobType.getRequestType(), jobType.getResultType());

                                @Override
                                public Type getType() {
                                    return _type;
                                }
                            };
                        }
                    });

    public static  JobStatus narrow(Object object, JobType jobType) {
        return JsonHelper.convert(object, getTypeReferenceForJobType(jobType));
    }

    @SuppressWarnings("unchecked")
    private static  TypeReference> getTypeReferenceForJobType(JobType jobType) {
        return (TypeReference) _jobStatusTypeReferences.getUnchecked(jobType);
    }
}