UserFunctionExecution.java example

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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 org.apache.geode.management.internal.cli.functions;

import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.CancellationException;

import org.apache.geode.cache.Cache;
import org.apache.geode.cache.CacheFactory;
import org.apache.geode.cache.Region;
import org.apache.geode.cache.execute.Execution;
import org.apache.geode.cache.execute.Function;
import org.apache.geode.cache.execute.FunctionContext;
import org.apache.geode.cache.execute.FunctionException;
import org.apache.geode.cache.execute.FunctionService;
import org.apache.geode.cache.execute.ResultCollector;
import org.apache.geode.distributed.DistributedMember;
import org.apache.geode.internal.ClassPathLoader;
import org.apache.geode.internal.InternalEntity;
import org.apache.geode.management.internal.cli.GfshParser;
import org.apache.geode.management.internal.cli.i18n.CliStrings;

/**
 * 
 * @since GemFire 7.0
 */
public class UserFunctionExecution implements Function, InternalEntity {
  public static final String ID = UserFunctionExecution.class.getName();

  private static final long serialVersionUID = 1L;

  @Override
  public void execute(FunctionContext context) {
    try {
      Cache cache = CacheFactory.getAnyInstance();
      DistributedMember member = cache.getDistributedSystem().getDistributedMember();
      String[] functionArgs = null;
      Object[] args = (Object[]) context.getArguments();
      if (args != null) {
        String functionId = ((String) args[0]);
        String filterString = ((String) args[1]);
        String resultCollectorName = ((String) args[2]);
        String argumentsString = ((String) args[3]);
        String onRegion = ((String) args[4]);

        try {
          if (argumentsString != null && argumentsString.length() > 0) {
            functionArgs = argumentsString.split(",");
          }
          Set<String> filters = new HashSet<String>();
          ResultCollector resultCollectorInstance = null;
          if (resultCollectorName != null && resultCollectorName.length() > 0) {
            resultCollectorInstance = (ResultCollector) ClassPathLoader.getLatest()
                .forName(resultCollectorName).newInstance();
          }
          if (filterString != null && filterString.length() > 0) {
            filters.add(filterString);
          }
          Function function = FunctionService.getFunction(functionId);

          if (function == null) {
            context.getResultSender().lastResult(CliStrings.format(
                CliStrings.EXECUTE_FUNCTION__MSG__DOES_NOT_HAVE_FUNCTION_0_REGISTERED, functionId));
          } else {
            Execution execution = null;
            if (onRegion != null && onRegion.length() > 0) {
              Region region = cache.getRegion(onRegion);
              if (region != null) {
                execution = FunctionService.onRegion(region);
              }
            } else {
              execution = FunctionService.onMember(member);
            }

            if (execution != null) {
              if (resultCollectorInstance != null) {
                execution = execution.withCollector(resultCollectorInstance);
              }

              if (functionArgs != null && functionArgs.length > 0) {
                execution = execution.withArgs(functionArgs);
              }
              if (filters != null && filters.size() > 0) {
                execution = execution.withFilter(filters);
              }

              List<Object> results = (List<Object>) execution.execute(function).getResult();

              StringBuilder resultMessege = new StringBuilder();
              if (results != null) {
                for (Object resultObj : results) {
                  if (resultObj != null) {
                    if (resultObj instanceof String) {
                      resultMessege.append(((String) resultObj));
                      resultMessege.append(GfshParser.LINE_SEPARATOR);
                    } else if (resultObj instanceof Exception) {
                      resultMessege.append(((IllegalArgumentException) resultObj).getMessage());
                    } else {
                      resultMessege.append(resultObj);
                      resultMessege.append(GfshParser.LINE_SEPARATOR);
                    }
                  }
                }
              }
              context.getResultSender().lastResult(resultMessege);
            } else {
              context.getResultSender()
                  .lastResult(CliStrings.format(
                      CliStrings.EXECUTE_FUNCTION__MSG__ERROR_IN_EXECUTING_0_ON_MEMBER_1_ON_REGION_2_DETAILS_3,
                      functionId, member.getId(), onRegion,
                      CliStrings.EXECUTE_FUNCTION__MSG__ERROR_IN_RETRIEVING_EXECUTOR));
            }
          }

        } catch (ClassNotFoundException e) {
          context.getResultSender()
              .lastResult(CliStrings.format(
                  CliStrings.EXECUTE_FUNCTION__MSG__RESULT_COLLECTOR_0_NOT_FOUND_ERROR_1,
                  resultCollectorName, e.getMessage()));
        } catch (FunctionException e) {
          context.getResultSender()
              .lastResult(CliStrings.format(
                  CliStrings.EXECUTE_FUNCTION__MSG__ERROR_IN_EXECUTING_ON_MEMBER_1_DETAILS_2,
                  functionId, member.getId(), e.getMessage()));
        } catch (CancellationException e) {
          context.getResultSender()
              .lastResult(CliStrings.format(
                  CliStrings.EXECUTE_FUNCTION__MSG__ERROR_IN_EXECUTING_ON_MEMBER_1_DETAILS_2,
                  functionId, member.getId(), e.getMessage()));
        } catch (InstantiationException e) {
          context.getResultSender()
              .lastResult(CliStrings.format(
                  CliStrings.EXECUTE_FUNCTION__MSG__RESULT_COLLECTOR_0_NOT_FOUND_ERROR_1,
                  resultCollectorName, e.getMessage()));
        } catch (IllegalAccessException e) {
          context.getResultSender()
              .lastResult(CliStrings.format(
                  CliStrings.EXECUTE_FUNCTION__MSG__RESULT_COLLECTOR_0_NOT_FOUND_ERROR_1,
                  resultCollectorName, e.getMessage()));
        } catch (Exception e) {
          context.getResultSender()
              .lastResult(CliStrings.format(
                  CliStrings.EXECUTE_FUNCTION__MSG__ERROR_IN_EXECUTING_ON_MEMBER_1_DETAILS_2,
                  functionId, member.getId(), e.getMessage()));
        }
      } else {
        context.getResultSender()
            .lastResult(CliStrings.EXECUTE_FUNCTION__MSG__COULD_NOT_RETRIEVE_ARGUMENTS);
      }

    } catch (Exception ex) {
      context.getResultSender().lastResult(ex.getMessage());
    }
  }

  @Override
  public String getId() {
    return UserFunctionExecution.ID;
  }

  @Override
  public boolean hasResult() {
    return true;
  }

  @Override
  public boolean optimizeForWrite() {
    // no need of optimization since read-only.
    return false;
  }

  @Override
  public boolean isHA() {
    return false;
  }

}