content: /**
   * Copyright 2010 The Apache Software Foundation
   *
   * 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 com.alibaba.wasp.client;
  
  import java.io.IOException;
  import java.util.Date;
  import java.util.List;
  
  /**
   * Exception thrown by Table methods when an attempt to do something (like
   * commit changes) fails after a bunch of retries.
   */
  public class RetriesExhaustedException extends IOException {
    private static final long serialVersionUID = 1876775844L;
  
    public RetriesExhaustedException(final String msg) {
      super(msg);
    }
  
    public RetriesExhaustedException(final String msg, final IOException e) {
      super(msg, e);
    }
  
    /**
     * Datastructure that allows adding more info around Throwable incident.
     */
    public static class ThrowableWithExtraContext {
      private final Throwable t;
      private final long when;
      private final String extras;
  
      public ThrowableWithExtraContext(final Throwable t, final long when,
          final String extras) {
        this.t = t;
        this.when = when;
        this.extras = extras;
      }
   
      @Override
      public String toString() {
        return new Date(this.when).toString() + ", " + extras + ", " + t.toString();
      }
    }
  
    /**
     * Create a new RetriesExhaustedException from the list of prior failures.
     * @param callableVitals Details from the {@link com.alibaba.wasp.client.ServerCallable} we were using
     * when we got this exception.
     * @param numTries The number of tries we made
     * @param exceptions List of exceptions that failed before giving up
     */
    public RetriesExhaustedException(final String callableVitals, int numTries,
                                     List<Throwable> exceptions) {
      super(getMessage(callableVitals, numTries, exceptions));
    }
  
    /**
     * Create a new RetriesExhaustedException from the list of prior failures.
     * @param numTries
     * @param exceptions List of exceptions that failed before giving up
     */
    public RetriesExhaustedException(final int numTries,
                                     final List<ThrowableWithExtraContext> exceptions) {
      super(getMessage(numTries, exceptions));
    }
  
    private static String getMessage(String callableVitals, int numTries,
        List<Throwable> exceptions) {
      StringBuilder buffer = new StringBuilder("Failed contacting ");
      buffer.append(callableVitals);
      buffer.append(" after ");
      buffer.append(numTries + 1);
      buffer.append(" attempts.\nExceptions:\n");
      for (Throwable t : exceptions) {
        buffer.append(t.toString());
        buffer.append("\n");
      }
      return buffer.toString();
    }
  
    private static String getMessage(final int numTries,
        final List<ThrowableWithExtraContext> exceptions) {
      StringBuilder buffer = new StringBuilder("Failed after attempts=");
      buffer.append(numTries + 1);
      buffer.append(", exceptions:\n");
      for (ThrowableWithExtraContext t : exceptions) {
        buffer.append(t.toString());
        buffer.append("\n");
      }
      return buffer.toString();
    }
  }