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TRAC D.A.P. metadata service, stateless service component to answer the TRAC metadata API
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/*
 * Copyright 2022 Accenture Global Solutions Limited
 *
 * 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.finos.tracdap.svc.meta.api;

import com.google.protobuf.Descriptors;
import org.finos.tracdap.api.*;
import org.finos.tracdap.common.exception.EUnexpected;
import org.finos.tracdap.common.grpc.GrpcServerWrap;
import org.finos.tracdap.metadata.Tag;
import org.finos.tracdap.metadata.TagHeader;
import org.finos.tracdap.svc.meta.services.MetadataReadService;
import org.finos.tracdap.svc.meta.services.MetadataSearchService;
import org.finos.tracdap.svc.meta.services.MetadataWriteService;
import io.grpc.MethodDescriptor;
import io.grpc.stub.StreamObserver;
import org.finos.tracdap.svc.meta.services.MetadataConstants;


public class TracMetadataApi extends TracMetadataApiGrpc.TracMetadataApiImplBase {

    private static final String SERVICE_NAME = TracMetadataApiGrpc.SERVICE_NAME.substring(TracMetadataApiGrpc.SERVICE_NAME.lastIndexOf(".") + 1);
    private static final Descriptors.ServiceDescriptor TRAC_METADATA_SERVICE = Metadata.getDescriptor().findServiceByName(SERVICE_NAME);

    static final MethodDescriptor CREATE_OBJECT_METHOD = TracMetadataApiGrpc.getCreateObjectMethod();
    static final MethodDescriptor UPDATE_OBJECT_METHOD = TracMetadataApiGrpc.getUpdateObjectMethod();
    static final MethodDescriptor UPDATE_TAG_METHOD = TracMetadataApiGrpc.getUpdateTagMethod();

    static final MethodDescriptor READ_OBJECT_METHOD = TracMetadataApiGrpc.getReadObjectMethod();
    static final MethodDescriptor READ_BATCH_METHOD = TracMetadataApiGrpc.getReadBatchMethod();
    static final MethodDescriptor SEARCH_METHOD = TracMetadataApiGrpc.getSearchMethod();

    static final MethodDescriptor GET_OBJECT_METHOD = TracMetadataApiGrpc.getGetObjectMethod();
    static final MethodDescriptor GET_LATEST_OBJECT_METHOD = TracMetadataApiGrpc.getGetLatestObjectMethod();
    static final MethodDescriptor GET_LATEST_TAG_METHOD = TracMetadataApiGrpc.getGetLatestTagMethod();

    private final MetadataApiImpl apiImpl;
    private final GrpcServerWrap grpcWrap;

    public TracMetadataApi(
            MetadataReadService readService,
            MetadataWriteService writeService,
            MetadataSearchService searchService) {

        if (TRAC_METADATA_SERVICE == null)
            throw new EUnexpected();

        apiImpl = new MetadataApiImpl(TRAC_METADATA_SERVICE, readService, writeService, searchService, MetadataConstants.PUBLIC_API);
        grpcWrap = new GrpcServerWrap();
    }

    @Override
    public void platformInfo(PlatformInfoRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::platformInfo);
    }

    @Override
    public void listTenants(ListTenantsRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::listTenants);
    }

    @Override
    public void writeBatch(MetadataWriteBatchRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::writeBatch);
    }

    @Override
    public void createObject(MetadataWriteRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::createObject);
    }

    @Override
    public void updateObject(MetadataWriteRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::updateObject);
    }

    @Override
    public void updateTag(MetadataWriteRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::updateTag);
    }

    @Override
    public void readObject(MetadataReadRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::readObject);
    }

    @Override
    public void readBatch(MetadataBatchRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::readBatch);
    }

    @Override
    public void search(MetadataSearchRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::search);
    }

    @Override
    public void getObject(MetadataGetRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::getObject);
    }

    @Override
    public void getLatestObject(MetadataGetRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::getLatestObject);
    }

    @Override
    public void getLatestTag(MetadataGetRequest request, StreamObserver response) {

        grpcWrap.unaryCall(request, response, apiImpl::getLatestTag);
    }
}