content: /*
   * 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.camel.component.file.strategy;
  
  import org.apache.camel.Exchange;
  import org.apache.camel.component.file.GenericFile;
  import org.apache.camel.component.file.GenericFileEndpoint;
  import org.apache.camel.component.file.GenericFileOperationFailedException;
  import org.apache.camel.component.file.GenericFileOperations;
  import org.apache.camel.support.ExchangeHelper;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class GenericFileDeleteProcessStrategy<T> extends GenericFileProcessStrategySupport<T> {
  
      private static final Logger LOG = LoggerFactory.getLogger(GenericFileDeleteProcessStrategy.class);
  
      private GenericFileRenamer<T> failureRenamer;
      private GenericFileRenamer<T> beginRenamer;
  
      @Override
      public boolean begin(
              GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file)
              throws Exception {
  
          // must invoke super
          boolean result = super.begin(operations, endpoint, exchange, file);
          if (!result) {
              return false;
          }
  
          // okay we got the file then execute the begin renamer
          if (beginRenamer != null) {
              GenericFile<T> newName = beginRenamer.renameFile(operations, exchange, file);
              GenericFile<T> to = renameFile(operations, file, newName);
              if (to != null) {
                  to.bindToExchange(exchange);
              }
          }
  
          return true;
      }
  
      @Override
      public void commit(
              GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file)
              throws Exception {
  
          // special for file lock strategy as we must release that lock first
          // before we can delete the file
          boolean releaseEager = exclusiveReadLockStrategy instanceof FileLockExclusiveReadLockStrategy;
  
          if (releaseEager) {
              exclusiveReadLockStrategy.releaseExclusiveReadLockOnCommit(operations, file, exchange);
          }
  
          try {
              deleteLocalWorkFile(exchange);
              operations.releaseRetrievedFileResources(exchange);
  
              int retries = 3;
              boolean deleted = false;
  
              while (retries > 0 && !deleted) {
                  retries--;
  
                  if (operations.deleteFile(file.getAbsoluteFilePath())) {
                      // file is deleted
                      deleted = true;
                      break;
                  }
  
                  // some OS can report false when deleting but the file is still
                  // deleted
                  // use exists to check instead
                  boolean exits = operations.existsFile(file.getAbsoluteFilePath());
                  if (!exits) {
                      deleted = true;
                  } else {
                      LOG.trace("File was not deleted at this attempt will try again in 1 sec.: {}", file);
                      // sleep a bit and try again
                      Thread.sleep(1000);
                  }
              }
              if (!deleted) {
                  throw new GenericFileOperationFailedException("Cannot delete file: " + file);
              }
          } finally {
              // must release lock last
              if (!releaseEager && exclusiveReadLockStrategy != null) {
                  exclusiveReadLockStrategy.releaseExclusiveReadLockOnCommit(operations, file, exchange);
              }
          }
      }
  
      @Override
      public void rollback(
              GenericFileOperations<T> operations, GenericFileEndpoint<T> endpoint, Exchange exchange, GenericFile<T> file)
              throws Exception {
          try {
              deleteLocalWorkFile(exchange);
              operations.releaseRetrievedFileResources(exchange);
  
              // moved the failed file if specifying the moveFailed option
              if (failureRenamer != null) {
                  // create a copy and bind the file to the exchange to be used by
                  // the renamer to evaluate the file name
                  Exchange copy = ExchangeHelper.createCopy(exchange, true);
                  file.bindToExchange(copy);
                  // must preserve message id
                  copy.getMessage().setMessageId(exchange.getMessage().getMessageId());
                  copy.setExchangeId(exchange.getExchangeId());
  
                  GenericFile<T> newName = failureRenamer.renameFile(operations, copy, file);
                  renameFile(operations, file, newName);
              }
          } finally {
              // must release lock last
              if (exclusiveReadLockStrategy != null) {
                  exclusiveReadLockStrategy.releaseExclusiveReadLockOnRollback(operations, file, exchange);
              }
          }
      }
  
      public GenericFileRenamer<T> getFailureRenamer() {
          return failureRenamer;
      }
  
      public void setFailureRenamer(GenericFileRenamer<T> failureRenamer) {
          this.failureRenamer = failureRenamer;
      }
  
      public GenericFileRenamer<T> getBeginRenamer() {
          return beginRenamer;
      }
  
      public void setBeginRenamer(GenericFileRenamer<T> beginRenamer) {
          this.beginRenamer = beginRenamer;
      }
  }
  