gerrit.onap Code Review - ccsdk/features.git/blob

   1 /*
   2  * ============LICENSE_START=======================================================
   3  * ONAP : ccsdk features
   4  * ================================================================================
   5  * Copyright (C) 2019 highstreet technologies GmbH Intellectual Property.
   6  * All rights reserved.
   7  * ================================================================================
   8  * Licensed under the Apache License, Version 2.0 (the "License");
   9  * you may not use this file except in compliance with the License.
  10  * You may obtain a copy of the License at
  11  *
  12  *     http://www.apache.org/licenses/LICENSE-2.0
  13  *
  14  * Unless required by applicable law or agreed to in writing, software
  15  * distributed under the License is distributed on an "AS IS" BASIS,
  16  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  17  * See the License for the specific language governing permissions and
  18  * limitations under the License.
  19  * ============LICENSE_END=========================================================
  20  *
  21  */
  22 package org.onap.ccsdk.features.sdnr.wt.dataprovider.impl;
  23
  24 import java.io.IOException;
  25 import java.io.PrintWriter;
  26 import java.io.StringWriter;
  27 import java.util.concurrent.TimeUnit;
  28
  29 import org.eclipse.jdt.annotation.NonNull;
  30 import org.onap.ccsdk.features.sdnr.wt.common.configuration.ConfigurationFileRepresentation;
  31 import org.onap.ccsdk.features.sdnr.wt.common.database.HtDatabaseClient;
  32 import org.onap.ccsdk.features.sdnr.wt.dataprovider.data.ElasticSearchDataProvider;
  33 import org.onap.ccsdk.features.sdnr.wt.dataprovider.data.MediatorServerDataProvider;
  34 import org.onap.ccsdk.features.sdnr.wt.dataprovider.http.MsServlet;
  35 import org.onap.ccsdk.features.sdnr.wt.dataprovider.model.DataProvider;
  36 import org.onap.ccsdk.features.sdnr.wt.dataprovider.model.HtDatabaseMaintenance;
  37 import org.onap.ccsdk.features.sdnr.wt.dataprovider.model.IEsConfig;
  38 import org.opendaylight.mdsal.binding.api.RpcProviderService;
  39 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.CreateMaintenanceInput;
  40 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.CreateMaintenanceOutput;
  41 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.CreateMediatorServerInput;
  42 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.CreateMediatorServerOutput;
  43 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.CreateNetworkElementConnectionInput;
  44 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.CreateNetworkElementConnectionOutput;
  45 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.DataProviderService;
  46 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.DeleteMaintenanceInput;
  47 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.DeleteMaintenanceOutput;
  48 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.DeleteMediatorServerInput;
  49 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.DeleteMediatorServerOutput;
  50 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.DeleteNetworkElementConnectionInput;
  51 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.DeleteNetworkElementConnectionOutput;
  52 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadConnectionlogListInput;
  53 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadConnectionlogListOutput;
  54 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadEventlogListInput;
  55 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadEventlogListOutput;
  56 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadFaultcurrentListInput;
  57 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadFaultcurrentListOutput;
  58 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadFaultlogListInput;
  59 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadFaultlogListOutput;
  60 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadInventoryListInput;
  61 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadInventoryListOutput;
  62 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadMaintenanceListInput;
  63 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadMaintenanceListOutput;
  64 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadMediatorServerListInput;
  65 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadMediatorServerListOutput;
  66 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadNetworkElementConnectionListInput;
  67 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadNetworkElementConnectionListOutput;
  68 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata15mDeviceListInput;
  69 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata15mDeviceListOutput;
  70 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata15mListInput;
  71 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata15mListOutput;
  72 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata15mLtpListInput;
  73 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata15mLtpListOutput;
  74 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata24hDeviceListInput;
  75 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata24hDeviceListOutput;
  76 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata24hListInput;
  77 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata24hListOutput;
  78 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata24hLtpListInput;
  79 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadPmdata24hLtpListOutput;
  80 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadStatusInput;
  81 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.ReadStatusOutput;
  82 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.UpdateMaintenanceInput;
  83 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.UpdateMaintenanceOutput;
  84 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.UpdateMediatorServerInput;
  85 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.UpdateMediatorServerOutput;
  86 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.UpdateNetworkElementConnectionInput;
  87 import org.opendaylight.yang.gen.v1.urn.opendaylight.params.xml.ns.yang.data.provider.rev190801.UpdateNetworkElementConnectionOutput;
  88 import org.opendaylight.yangtools.concepts.Builder;
  89 import org.opendaylight.yangtools.concepts.ObjectRegistration;
  90 import org.opendaylight.yangtools.yang.binding.DataObject;
  91 import org.opendaylight.yangtools.yang.common.RpcError.ErrorType;
  92 import org.opendaylight.yangtools.yang.common.RpcResult;
  93 import org.opendaylight.yangtools.yang.common.RpcResultBuilder;
  94 import org.slf4j.Logger;
  95 import org.slf4j.LoggerFactory;
  96
  97 import com.google.common.util.concurrent.ListenableFuture;
  98
  99 public class DataProviderServiceImpl implements DataProviderService, AutoCloseable {
 100
 101     private static final Logger LOG = LoggerFactory.getLogger(DataProviderServiceImpl.class);
 102     public static final String CONFIGURATIONFILE = "etc/dataprovider.properties";
 103     private static final long DATABASE_TIMEOUT_MS = 120 * 1000L;
 104
 105     private final ObjectRegistration<@NonNull DataProviderServiceImpl> rpcReg;
 106     private final ElasticSearchDataProvider dataProvider;
 107     private final ConfigurationFileRepresentation configuration;
 108     private final EsConfig esConfig;
 109     private final MediatorServerDataProvider mediatorServerDataProvider;
 110
 111     DataProviderServiceImpl(final RpcProviderService rpcProviderService, MsServlet mediatorServerServlet)
 112             throws Exception {
 113         this.configuration = new ConfigurationFileRepresentation(CONFIGURATIONFILE);
 114         this.esConfig = new EsConfig(configuration);
 115         this.dataProvider = new ElasticSearchDataProvider(esConfig.getHosts(), esConfig.getBasicAuthUsername(),
 116                 esConfig.getBasicAuthPassword(), esConfig.trustAllCerts());
 117         this.dataProvider.waitForYellowDatabaseStatus(DATABASE_TIMEOUT_MS, TimeUnit.MILLISECONDS);
 118         this.mediatorServerDataProvider = new MediatorServerDataProvider(esConfig.getHosts(),
 119                 esConfig.getBasicAuthUsername(), esConfig.getBasicAuthPassword());
 120         mediatorServerServlet.setDataProvider(this.mediatorServerDataProvider);
 121         // Register ourselves as the REST API RPC implementation
 122         LOG.info("Register RPC Service " + DataProviderServiceImpl.class.getSimpleName());
 123         this.rpcReg = rpcProviderService.registerRpcImplementation(DataProviderService.class, this);
 124     }
 125
 126     private void sendResyncCallbackToApiGateway() {
 127         mediatorServerDataProvider.triggerReloadSync();
 128     }
 129
 130     /**
 131      * @return dataProvider
 132      */
 133     public DataProvider getDataProvider() {
 134         return dataProvider.getDataProvider();
 135     }
 136
 137     public HtDatabaseClient getRawClient() {
 138         return this.dataProvider.getRawClient();
 139     }
 140
 141     /**
 142      * @return data provider for Maintenance()
 143      */
 144     public HtDatabaseMaintenance getHtDatabaseMaintenance() {
 145         return dataProvider.getHtDatabaseMaintenance();
 146     }
 147
 148     /**
 149      * @return configuration object
 150      */
 151     public IEsConfig getEsConfig() {
 152         return esConfig;
 153     }
 154
 155
 156     @Override
 157     public void close() throws Exception {
 158         LOG.info("Close RPC Service");
 159         if (rpcReg != null) {
 160             rpcReg.close();
 161         }
 162     }
 163
 164     @Override
 165     public ListenableFuture<RpcResult<ReadFaultcurrentListOutput>> readFaultcurrentList(
 166             ReadFaultcurrentListInput input) {
 167         LOG.debug("RPC Request: getFaultCurrentEntityList with input {}", input);
 168         RpcResultBuilder<ReadFaultcurrentListOutput> result =
 169                 read(() -> DataProviderServiceImpl.this.dataProvider.readFaultCurrentList(input));
 170         return result.buildFuture();
 171     }
 172
 173     @Override
 174     public ListenableFuture<RpcResult<ReadFaultlogListOutput>> readFaultlogList(ReadFaultlogListInput input) {
 175         LOG.debug("RPC Request: getFaultCurrentEntityList with input {}", input);
 176         RpcResultBuilder<ReadFaultlogListOutput> result =
 177                 read(() -> DataProviderServiceImpl.this.dataProvider.readFaultLogList(input));
 178         return result.buildFuture();
 179     }
 180
 181     @Override
 182     public ListenableFuture<RpcResult<ReadMaintenanceListOutput>> readMaintenanceList(ReadMaintenanceListInput input) {
 183         LOG.debug("RPC Request: getMaintenanceEntityList with input {}", input);
 184         RpcResultBuilder<ReadMaintenanceListOutput> result =
 185                 read(() -> DataProviderServiceImpl.this.dataProvider.readMaintenanceList(input));
 186         return result.buildFuture();
 187     }
 188
 189     @Override
 190     public ListenableFuture<RpcResult<ReadMediatorServerListOutput>> readMediatorServerList(
 191             ReadMediatorServerListInput input) {
 192         LOG.debug("RPC Request: getMediatorServerEntityList with input {}", input);
 193         RpcResultBuilder<ReadMediatorServerListOutput> result =
 194                 read(() -> DataProviderServiceImpl.this.dataProvider.readMediatorServerList(input));
 195         return result.buildFuture();
 196     }
 197
 198     @Override
 199     public ListenableFuture<RpcResult<ReadNetworkElementConnectionListOutput>> readNetworkElementConnectionList(
 200             ReadNetworkElementConnectionListInput input) {
 201         LOG.debug("RPC Request: getNetworkElementConnectionEntityList with input {}", input);
 202         RpcResultBuilder<ReadNetworkElementConnectionListOutput> result =
 203                 read(() -> DataProviderServiceImpl.this.dataProvider.readNetworkElementConnectionList(input));
 204         return result.buildFuture();
 205
 206     }
 207
 208     @Override
 209     public ListenableFuture<RpcResult<ReadPmdata15mListOutput>> readPmdata15mList(ReadPmdata15mListInput input) {
 210         LOG.debug("RPC Request: getNetworkElementConnectionEntityList with input {}", input);
 211         RpcResultBuilder<ReadPmdata15mListOutput> result =
 212                 read(() -> DataProviderServiceImpl.this.dataProvider.readPmdata15mList(input));
 213         return result.buildFuture();
 214
 215     }
 216
 217     @Override
 218     public ListenableFuture<RpcResult<ReadPmdata24hListOutput>> readPmdata24hList(ReadPmdata24hListInput input) {
 219         LOG.debug("RPC Request: getNetworkElementConnectionEntityList with input {}", input);
 220         RpcResultBuilder<ReadPmdata24hListOutput> result =
 221                 read(() -> DataProviderServiceImpl.this.dataProvider.readPmdata24hList(input));
 222         return result.buildFuture();
 223
 224     }
 225
 226     @Override
 227     public ListenableFuture<RpcResult<ReadStatusOutput>> readStatus(ReadStatusInput input) {
 228         LOG.debug("RPC Request: getStatusEntityList with input {}", input);
 229         RpcResultBuilder<ReadStatusOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.readStatus());
 230         return result.buildFuture();
 231
 232     }
 233
 234     @Override
 235     public ListenableFuture<RpcResult<ReadInventoryListOutput>> readInventoryList(ReadInventoryListInput input) {
 236         LOG.debug("RPC Request: getInventoryEntityList with input {}", input);
 237         RpcResultBuilder<ReadInventoryListOutput> result =
 238                 read(() -> DataProviderServiceImpl.this.dataProvider.readInventoryList(input));
 239         return result.buildFuture();
 240     }
 241
 242     @Override
 243     public ListenableFuture<RpcResult<ReadPmdata15mLtpListOutput>> readPmdata15mLtpList(
 244             ReadPmdata15mLtpListInput input) {
 245         LOG.debug("RPC Request: readPmdataLtpList with input {}", input);
 246         RpcResultBuilder<ReadPmdata15mLtpListOutput> result =
 247                 read(() -> DataProviderServiceImpl.this.dataProvider.readPmdata15mLtpList(input));
 248         return result.buildFuture();
 249     }
 250
 251     @Override
 252     public ListenableFuture<RpcResult<ReadPmdata15mDeviceListOutput>> readPmdata15mDeviceList(
 253             ReadPmdata15mDeviceListInput input) {
 254         LOG.debug("RPC Request: readPmdataDeviceList with input {}", input);
 255         RpcResultBuilder<ReadPmdata15mDeviceListOutput> result =
 256                 read(() -> DataProviderServiceImpl.this.dataProvider.readPmdata15mDeviceList(input));
 257         return result.buildFuture();
 258     }
 259
 260     @Override
 261     public ListenableFuture<RpcResult<ReadPmdata24hLtpListOutput>> readPmdata24hLtpList(
 262             ReadPmdata24hLtpListInput input) {
 263         LOG.debug("RPC Request: readPmdataLtpList with input {}", input);
 264         RpcResultBuilder<ReadPmdata24hLtpListOutput> result =
 265                 read(() -> DataProviderServiceImpl.this.dataProvider.readPmdata24hLtpList(input));
 266         return result.buildFuture();
 267     }
 268
 269     @Override
 270     public ListenableFuture<RpcResult<ReadPmdata24hDeviceListOutput>> readPmdata24hDeviceList(
 271             ReadPmdata24hDeviceListInput input) {
 272         LOG.debug("RPC Request: readPmdataDeviceList with input {}", input);
 273         RpcResultBuilder<ReadPmdata24hDeviceListOutput> result =
 274                 read(() -> DataProviderServiceImpl.this.dataProvider.readPmdata24hDeviceList(input));
 275         return result.buildFuture();
 276     }
 277
 278     @Override
 279     public ListenableFuture<RpcResult<ReadConnectionlogListOutput>> readConnectionlogList(
 280             ReadConnectionlogListInput input) {
 281         LOG.debug("RPC Request: readConnectionlogList with input {}", input);
 282         RpcResultBuilder<ReadConnectionlogListOutput> result =
 283                 read(() -> DataProviderServiceImpl.this.dataProvider.readConnectionlogList(input));
 284         return result.buildFuture();
 285     }
 286
 287     @Override
 288     public ListenableFuture<RpcResult<CreateNetworkElementConnectionOutput>> createNetworkElementConnection(
 289             CreateNetworkElementConnectionInput input) {
 290         LOG.debug("RPC Request: createNetworkElementConnection with input {}", input);
 291         RpcResultBuilder<CreateNetworkElementConnectionOutput> result =
 292                 read(() -> DataProviderServiceImpl.this.dataProvider.createNetworkElementConnection(input));
 293         return result.buildFuture();
 294     }
 295
 296     @Override
 297     public ListenableFuture<RpcResult<UpdateNetworkElementConnectionOutput>> updateNetworkElementConnection(
 298             UpdateNetworkElementConnectionInput input) {
 299         LOG.debug("RPC Request: updateNetworkElementConnection with input {}", input);
 300         RpcResultBuilder<UpdateNetworkElementConnectionOutput> result =
 301                 read(() -> DataProviderServiceImpl.this.dataProvider.updateNetworkElementConnection(input));
 302         return result.buildFuture();
 303     }
 304
 305     @Override
 306     public ListenableFuture<RpcResult<DeleteNetworkElementConnectionOutput>> deleteNetworkElementConnection(
 307             DeleteNetworkElementConnectionInput input) {
 308         RpcResultBuilder<DeleteNetworkElementConnectionOutput> result =
 309                 read(() -> DataProviderServiceImpl.this.dataProvider.deleteNetworkElementConnection(input));
 310         return result.buildFuture();
 311     }
 312
 313     @Override
 314     public ListenableFuture<RpcResult<DeleteMediatorServerOutput>> deleteMediatorServer(
 315             DeleteMediatorServerInput input) {
 316         LOG.debug("RPC Request: deleteMediatorServer with input {}", input);
 317         RpcResultBuilder<DeleteMediatorServerOutput> result =
 318                 read(() -> DataProviderServiceImpl.this.dataProvider.deleteMediatorServer(input));
 319         this.sendResyncCallbackToApiGateway();
 320         return result.buildFuture();
 321     }
 322
 323     @Override
 324     public ListenableFuture<RpcResult<CreateMediatorServerOutput>> createMediatorServer(
 325             CreateMediatorServerInput input) {
 326         LOG.debug("RPC Request: createMediatorServer with input {}", input);
 327         RpcResultBuilder<CreateMediatorServerOutput> result =
 328                 read(() -> DataProviderServiceImpl.this.dataProvider.createMediatorServer(input));
 329         this.sendResyncCallbackToApiGateway();
 330         return result.buildFuture();
 331     }
 332
 333     @Override
 334     public ListenableFuture<RpcResult<CreateMaintenanceOutput>> createMaintenance(CreateMaintenanceInput input) {
 335         LOG.debug("RPC Request: createMaintenance with input {}", input);
 336         RpcResultBuilder<CreateMaintenanceOutput> result =
 337                 read(() -> DataProviderServiceImpl.this.dataProvider.createMaintenance(input));
 338         return result.buildFuture();
 339     }
 340
 341     @Override
 342     public ListenableFuture<RpcResult<DeleteMaintenanceOutput>> deleteMaintenance(DeleteMaintenanceInput input) {
 343         LOG.debug("RPC Request: deleteMaintenance with input {}", input);
 344         RpcResultBuilder<DeleteMaintenanceOutput> result =
 345                 read(() -> DataProviderServiceImpl.this.dataProvider.deleteMaintenance(input));
 346         return result.buildFuture();
 347     }
 348
 349     @Override
 350     public ListenableFuture<RpcResult<UpdateMediatorServerOutput>> updateMediatorServer(
 351             UpdateMediatorServerInput input) {
 352         LOG.debug("RPC Request: updateMediatorServer with input {}", input);
 353         RpcResultBuilder<UpdateMediatorServerOutput> result =
 354                 read(() -> DataProviderServiceImpl.this.dataProvider.updateMediatorServer(input));
 355         this.sendResyncCallbackToApiGateway();
 356         return result.buildFuture();
 357     }
 358
 359     @Override
 360     public ListenableFuture<RpcResult<UpdateMaintenanceOutput>> updateMaintenance(UpdateMaintenanceInput input) {
 361         LOG.debug("RPC Request: updateMaintenance with input {}", input);
 362         RpcResultBuilder<UpdateMaintenanceOutput> result =
 363                 read(() -> DataProviderServiceImpl.this.dataProvider.updateMaintenance(input));
 364         return result.buildFuture();
 365     }
 366
 367     @Override
 368     public ListenableFuture<RpcResult<ReadEventlogListOutput>> readEventlogList(ReadEventlogListInput input) {
 369         LOG.debug("RPC Request: readEventlogList with input {}", input);
 370         RpcResultBuilder<ReadEventlogListOutput> result =
 371                 read(() -> DataProviderServiceImpl.this.dataProvider.readEventlogList(input));
 372         return result.buildFuture();
 373     }
 374
 375     // -- private classes and functions
 376
 377     private static String assembleExceptionMessage(Exception e) {
 378         StringWriter sw = new StringWriter();
 379         PrintWriter pw = new PrintWriter(sw);
 380         e.printStackTrace(pw);
 381
 382         StringBuffer buf = new StringBuffer();
 383         buf.append("Exception: ");
 384         buf.append(sw.toString());
 385         return buf.toString();
 386     }
 387
 388     private interface GetEntityInput<O extends DataObject> {
 389         Builder<O> get() throws IOException;
 390     }
 391
 392     private static <O extends DataObject, I extends DataObject> RpcResultBuilder<O> read(
 393             GetEntityInput<O> inputgetter) {
 394         RpcResultBuilder<O> result;
 395         try {
 396             Builder<O> outputBuilder = inputgetter.get();
 397             result = RpcResultBuilder.success(outputBuilder);
 398         } catch (Exception e) {
 399             LOG.info("Exception", e);
 400             result = RpcResultBuilder.failed();
 401             result.withError(ErrorType.APPLICATION, assembleExceptionMessage(e));
 402         }
 403         return result;
 404     }
 405
 406 }