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) throws Exception {
 112         this.configuration = new ConfigurationFileRepresentation(CONFIGURATIONFILE);
 113         this.esConfig = new EsConfig(configuration);
 114         this.dataProvider = new ElasticSearchDataProvider(esConfig.getHosts(),esConfig.getBasicAuthUsername(),esConfig.getBasicAuthPassword());
 115         this.dataProvider.waitForYellowDatabaseStatus(DATABASE_TIMEOUT_MS,TimeUnit.MILLISECONDS);
 116         this.mediatorServerDataProvider = new MediatorServerDataProvider(esConfig.getHosts(),esConfig.getBasicAuthUsername(),esConfig.getBasicAuthPassword());
 117         mediatorServerServlet.setDataProvider(this.mediatorServerDataProvider);
 118         // Register ourselves as the REST API RPC implementation
 119         LOG.info("Register RPC Service " + DataProviderServiceImpl.class.getSimpleName());
 120         this.rpcReg = rpcProviderService.registerRpcImplementation(DataProviderService.class, this);
 121     }
 122     private void sendResyncCallbackToApiGateway() {
 123         mediatorServerDataProvider.triggerReloadSync();
 124     }
 125     /**
 126      * @return dataProvider
 127      */
 128     public DataProvider getDataProvider() {
 129         return dataProvider.getDataProvider();
 130     }
 131
 132     public HtDatabaseClient getRawClient() {
 133         return this.dataProvider.getRawClient();
 134     }
 135     /**
 136      * @return data provider for Maintenance()
 137      */
 138     public HtDatabaseMaintenance getHtDatabaseMaintenance() {
 139         return dataProvider.getHtDatabaseMaintenance();
 140     }
 141
 142     /**
 143      * @return configuration object
 144      */
 145     public IEsConfig getEsConfig() {
 146         return esConfig;
 147     }
 148
 149
 150     @Override
 151     public void close() throws Exception {
 152         LOG.info("Close RPC Service");
 153         if (rpcReg != null) {
 154             rpcReg.close();
 155         }
 156     }
 157
 158     @Override
 159     public ListenableFuture<RpcResult<ReadFaultcurrentListOutput>> readFaultcurrentList(ReadFaultcurrentListInput input) {
 160         LOG.debug("RPC Request: getFaultCurrentEntityList with input {}", input);
 161         RpcResultBuilder<ReadFaultcurrentListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readFaultCurrentList(input));
 162         return result.buildFuture();
 163     }
 164     @Override
 165     public ListenableFuture<RpcResult<ReadFaultlogListOutput>> readFaultlogList(ReadFaultlogListInput input) {
 166         LOG.debug("RPC Request: getFaultCurrentEntityList with input {}", input);
 167         RpcResultBuilder<ReadFaultlogListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readFaultLogList(input));
 168         return result.buildFuture();
 169     }
 170
 171     @Override
 172     public ListenableFuture<RpcResult<ReadMaintenanceListOutput>> readMaintenanceList(ReadMaintenanceListInput input) {
 173         LOG.debug("RPC Request: getMaintenanceEntityList with input {}", input);
 174         RpcResultBuilder<ReadMaintenanceListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readMaintenanceList(input));
 175         return result.buildFuture();
 176     }
 177
 178     @Override
 179     public ListenableFuture<RpcResult<ReadMediatorServerListOutput>> readMediatorServerList(
 180             ReadMediatorServerListInput input) {
 181         LOG.debug("RPC Request: getMediatorServerEntityList with input {}", input);
 182         RpcResultBuilder<ReadMediatorServerListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readMediatorServerList(input));
 183         return result.buildFuture();
 184     }
 185
 186     @Override
 187     public ListenableFuture<RpcResult<ReadNetworkElementConnectionListOutput>> readNetworkElementConnectionList(
 188             ReadNetworkElementConnectionListInput input) {
 189         LOG.debug("RPC Request: getNetworkElementConnectionEntityList with input {}", input);
 190         RpcResultBuilder<ReadNetworkElementConnectionListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readNetworkElementConnectionList(input));
 191         return result.buildFuture();
 192
 193     }
 194
 195     @Override
 196     public ListenableFuture<RpcResult<ReadPmdata15mListOutput>> readPmdata15mList(ReadPmdata15mListInput input) {
 197         LOG.debug("RPC Request: getNetworkElementConnectionEntityList with input {}", input);
 198         RpcResultBuilder<ReadPmdata15mListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readPmdata15mList(input));
 199         return result.buildFuture();
 200
 201     }
 202     @Override
 203     public ListenableFuture<RpcResult<ReadPmdata24hListOutput>> readPmdata24hList(ReadPmdata24hListInput input) {
 204         LOG.debug("RPC Request: getNetworkElementConnectionEntityList with input {}", input);
 205         RpcResultBuilder<ReadPmdata24hListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readPmdata24hList(input));
 206         return result.buildFuture();
 207
 208     }
 209     @Override
 210     public ListenableFuture<RpcResult<ReadStatusOutput>> readStatus(ReadStatusInput input) {
 211         LOG.debug("RPC Request: getStatusEntityList with input {}", input);
 212         RpcResultBuilder<ReadStatusOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readStatus());
 213         return result.buildFuture();
 214
 215     }
 216
 217     @Override
 218     public ListenableFuture<RpcResult<ReadInventoryListOutput>> readInventoryList(ReadInventoryListInput input) {
 219         LOG.debug("RPC Request: getInventoryEntityList with input {}", input);
 220         RpcResultBuilder<ReadInventoryListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readInventoryList(input));
 221         return result.buildFuture();
 222     }
 223
 224     @Override
 225     public ListenableFuture<RpcResult<ReadPmdata15mLtpListOutput>> readPmdata15mLtpList(ReadPmdata15mLtpListInput input) {
 226         LOG.debug("RPC Request: readPmdataLtpList with input {}", input);
 227         RpcResultBuilder<ReadPmdata15mLtpListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readPmdata15mLtpList(input));
 228         return result.buildFuture();
 229     }
 230
 231     @Override
 232     public ListenableFuture<RpcResult<ReadPmdata15mDeviceListOutput>> readPmdata15mDeviceList(ReadPmdata15mDeviceListInput input) {
 233             LOG.debug("RPC Request: readPmdataDeviceList with input {}", input);
 234             RpcResultBuilder<ReadPmdata15mDeviceListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readPmdata15mDeviceList(input));
 235             return result.buildFuture();
 236     }
 237
 238     @Override
 239     public ListenableFuture<RpcResult<ReadPmdata24hLtpListOutput>> readPmdata24hLtpList(ReadPmdata24hLtpListInput input) {
 240         LOG.debug("RPC Request: readPmdataLtpList with input {}", input);
 241         RpcResultBuilder<ReadPmdata24hLtpListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readPmdata24hLtpList(input));
 242         return result.buildFuture();
 243     }
 244
 245     @Override
 246     public ListenableFuture<RpcResult<ReadPmdata24hDeviceListOutput>> readPmdata24hDeviceList(ReadPmdata24hDeviceListInput input) {
 247             LOG.debug("RPC Request: readPmdataDeviceList with input {}", input);
 248             RpcResultBuilder<ReadPmdata24hDeviceListOutput> result = read(()-> DataProviderServiceImpl.this.dataProvider.readPmdata24hDeviceList(input));
 249             return result.buildFuture();
 250     }
 251
 252     @Override
 253     public ListenableFuture<RpcResult<ReadConnectionlogListOutput>> readConnectionlogList(
 254             ReadConnectionlogListInput input) {
 255         LOG.debug("RPC Request: readConnectionlogList with input {}", input);
 256         RpcResultBuilder<ReadConnectionlogListOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.readConnectionlogList(input));
 257         return result.buildFuture();
 258     }
 259
 260     @Override
 261     public ListenableFuture<RpcResult<CreateNetworkElementConnectionOutput>> createNetworkElementConnection(
 262             CreateNetworkElementConnectionInput input) {
 263         LOG.debug("RPC Request: createNetworkElementConnection with input {}", input);
 264         RpcResultBuilder<CreateNetworkElementConnectionOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.createNetworkElementConnection(input));
 265         return result.buildFuture();
 266     }
 267
 268     @Override
 269     public ListenableFuture<RpcResult<UpdateNetworkElementConnectionOutput>> updateNetworkElementConnection(
 270             UpdateNetworkElementConnectionInput input) {
 271         LOG.debug("RPC Request: updateNetworkElementConnection with input {}", input);
 272         RpcResultBuilder<UpdateNetworkElementConnectionOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.updateNetworkElementConnection(input));
 273         return result.buildFuture();
 274     }
 275
 276     @Override
 277     public ListenableFuture<RpcResult<DeleteNetworkElementConnectionOutput>> deleteNetworkElementConnection(
 278             DeleteNetworkElementConnectionInput input) {
 279         RpcResultBuilder<DeleteNetworkElementConnectionOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.deleteNetworkElementConnection(input));
 280         return result.buildFuture();
 281     }
 282
 283     @Override
 284     public ListenableFuture<RpcResult<DeleteMediatorServerOutput>> deleteMediatorServer(
 285             DeleteMediatorServerInput input) {
 286         LOG.debug("RPC Request: deleteMediatorServer with input {}", input);
 287         RpcResultBuilder<DeleteMediatorServerOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.deleteMediatorServer(input));
 288         this.sendResyncCallbackToApiGateway();
 289         return result.buildFuture();
 290     }
 291
 292     @Override
 293     public ListenableFuture<RpcResult<CreateMediatorServerOutput>> createMediatorServer(
 294             CreateMediatorServerInput input) {
 295         LOG.debug("RPC Request: createMediatorServer with input {}", input);
 296         RpcResultBuilder<CreateMediatorServerOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.createMediatorServer(input));
 297         this.sendResyncCallbackToApiGateway();
 298         return result.buildFuture();
 299     }
 300
 301     @Override
 302     public ListenableFuture<RpcResult<CreateMaintenanceOutput>> createMaintenance(CreateMaintenanceInput input) {
 303         LOG.debug("RPC Request: createMaintenance with input {}", input);
 304         RpcResultBuilder<CreateMaintenanceOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.createMaintenance(input));
 305         return result.buildFuture();
 306     }
 307
 308     @Override
 309     public ListenableFuture<RpcResult<DeleteMaintenanceOutput>> deleteMaintenance(DeleteMaintenanceInput input) {
 310         LOG.debug("RPC Request: deleteMaintenance with input {}", input);
 311         RpcResultBuilder<DeleteMaintenanceOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.deleteMaintenance(input));
 312         return result.buildFuture();
 313     }
 314
 315     @Override
 316     public ListenableFuture<RpcResult<UpdateMediatorServerOutput>> updateMediatorServer(
 317             UpdateMediatorServerInput input) {
 318         LOG.debug("RPC Request: updateMediatorServer with input {}", input);
 319         RpcResultBuilder<UpdateMediatorServerOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.updateMediatorServer(input));
 320         this.sendResyncCallbackToApiGateway();
 321         return result.buildFuture();
 322     }
 323
 324     @Override
 325     public ListenableFuture<RpcResult<UpdateMaintenanceOutput>> updateMaintenance(UpdateMaintenanceInput input) {
 326         LOG.debug("RPC Request: updateMaintenance with input {}", input);
 327         RpcResultBuilder<UpdateMaintenanceOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.updateMaintenance(input));
 328         return result.buildFuture();
 329     }
 330
 331     @Override
 332     public ListenableFuture<RpcResult<ReadEventlogListOutput>> readEventlogList(ReadEventlogListInput input) {
 333         LOG.debug("RPC Request: readEventlogList with input {}", input);
 334         RpcResultBuilder<ReadEventlogListOutput> result = read(() -> DataProviderServiceImpl.this.dataProvider.readEventlogList(input));
 335         return result.buildFuture();
 336     }
 337
 338     // -- private classes and functions
 339
 340     private static String assembleExceptionMessage(Exception e) {
 341         StringWriter sw = new StringWriter();
 342         PrintWriter pw = new PrintWriter(sw);
 343         e.printStackTrace(pw);
 344
 345         StringBuffer buf = new StringBuffer();
 346         buf.append("Exception: ");
 347         buf.append(sw.toString());
 348         return buf.toString();
 349     }
 350
 351     private interface GetEntityInput<O extends DataObject> {
 352         Builder<O> get() throws IOException;
 353     }
 354
 355     private static <O extends DataObject,I extends DataObject> RpcResultBuilder<O> read(GetEntityInput<O> inputgetter ) {
 356         RpcResultBuilder<O> result;
 357         try {
 358             Builder<O> outputBuilder = inputgetter.get();
 359             result = RpcResultBuilder.success(outputBuilder);
 360         } catch (Exception e) {
 361             LOG.info("Exception", e);
 362             result = RpcResultBuilder.failed();
 363             result.withError(ErrorType.APPLICATION, assembleExceptionMessage(e));
 364         }
 365         return result;
 366     }
 367
 368 }