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 com.datastax.oss.driver.api.core;
  
  import com.datastax.oss.driver.api.core.cql.ExecutionInfo;
  import com.datastax.oss.driver.api.core.metadata.Node;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableList;
  import com.datastax.oss.driver.shaded.guava.common.collect.ImmutableMap;
  import com.datastax.oss.driver.shaded.guava.common.collect.Iterables;
  import edu.umd.cs.findbugs.annotations.NonNull;
  import edu.umd.cs.findbugs.annotations.Nullable;
  import java.util.ArrayList;
  import java.util.Iterator;
  import java.util.LinkedHashMap;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  
  /**
   * Thrown when a query failed on all the coordinators it was tried on. This exception may wrap
   * multiple errors, that are available either as {@linkplain #getSuppressed() suppressed
   * exceptions}, or via {@link #getAllErrors()} where they are grouped by node.
   */
  public class AllNodesFailedException extends DriverException {
  
    /** @deprecated Use {@link #fromErrors(List)} instead. */
    @NonNull
    @Deprecated
    public static AllNodesFailedException fromErrors(@Nullable Map<Node, Throwable> errors) {
      if (errors == null || errors.isEmpty()) {
        return new NoNodeAvailableException();
      } else {
        return new AllNodesFailedException(groupByNode(errors));
      }
    }
  
    @NonNull
    public static AllNodesFailedException fromErrors(@Nullable List<Entry<Node, Throwable>> errors) {
      if (errors == null || errors.isEmpty()) {
        return new NoNodeAvailableException();
      } else {
        return new AllNodesFailedException(groupByNode(errors));
      }
    }
  
    private final Map<Node, List<Throwable>> errors;
  
    /** @deprecated Use {@link #AllNodesFailedException(String, ExecutionInfo, Iterable)} instead. */
    @Deprecated
    protected AllNodesFailedException(
        @NonNull String message,
        @Nullable ExecutionInfo executionInfo,
        @NonNull Map<Node, Throwable> errors) {
      super(message, executionInfo, null, true);
      this.errors = toDeepImmutableMap(groupByNode(errors));
      addSuppressedErrors();
    }
  
    protected AllNodesFailedException(
        @NonNull String message,
        @Nullable ExecutionInfo executionInfo,
        @NonNull Iterable<Entry<Node, List<Throwable>>> errors) {
      super(message, executionInfo, null, true);
      this.errors = toDeepImmutableMap(errors);
      addSuppressedErrors();
    }
  
    private void addSuppressedErrors() {
      for (List<Throwable> errors : this.errors.values()) {
        for (Throwable error : errors) {
          addSuppressed(error);
        }
      }
    }
  
    private AllNodesFailedException(Map<Node, List<Throwable>> errors) {
      this(
          buildMessage(
              String.format("All %d node(s) tried for the query failed", errors.size()), errors),
          null,
          errors.entrySet());
    }
  
    private static String buildMessage(String baseMessage, Map<Node, List<Throwable>> errors) {
      int limit = Math.min(errors.size(), 3);
      Iterator<Entry<Node, List<Throwable>>> iterator =
          Iterables.limit(errors.entrySet(), limit).iterator();
      StringBuilder details = new StringBuilder();
      while (iterator.hasNext()) {
        Entry<Node, List<Throwable>> entry = iterator.next();
        details.append(entry.getKey()).append(": ").append(entry.getValue());
        if (iterator.hasNext()) {
          details.append(", ");
        }
      }
      return String.format(
          "%s (showing first %d nodes, use getAllErrors() for more): %s",
          baseMessage, limit, details);
    }
  
    /**
     * An immutable map containing the first error on each tried node.
     *
     * @deprecated Use {@link #getAllErrors()} instead.
     */
    @NonNull
    @Deprecated
    public Map<Node, Throwable> getErrors() {
      ImmutableMap.Builder<Node, Throwable> builder = ImmutableMap.builder();
      for (Node node : errors.keySet()) {
        List<Throwable> nodeErrors = errors.get(node);
        if (!nodeErrors.isEmpty()) {
          builder.put(node, nodeErrors.get(0));
        }
      }
      return builder.build();
    }
  
    /** An immutable map containing all errors on each tried node. */
    @NonNull
    public Map<Node, List<Throwable>> getAllErrors() {
      return errors;
    }
  
    @NonNull
    @Override
    public DriverException copy() {
      return new AllNodesFailedException(getMessage(), getExecutionInfo(), errors.entrySet());
    }
  
    @NonNull
    public AllNodesFailedException reword(String newMessage) {
      return new AllNodesFailedException(
          buildMessage(newMessage, errors), getExecutionInfo(), errors.entrySet());
    }
  
    private static Map<Node, List<Throwable>> groupByNode(Map<Node, Throwable> errors) {
      return groupByNode(errors.entrySet());
    }
  
    private static Map<Node, List<Throwable>> groupByNode(Iterable<Entry<Node, Throwable>> errors) {
      // no need for immutable collections here
      Map<Node, List<Throwable>> map = new LinkedHashMap<>();
      for (Entry<Node, Throwable> entry : errors) {
        Node node = entry.getKey();
        Throwable error = entry.getValue();
        map.compute(
            node,
            (k, v) -> {
              if (v == null) {
                v = new ArrayList<>();
              }
              v.add(error);
              return v;
            });
      }
      return map;
    }
  
    private static Map<Node, List<Throwable>> toDeepImmutableMap(Map<Node, List<Throwable>> errors) {
      return toDeepImmutableMap(errors.entrySet());
    }
  
    private static Map<Node, List<Throwable>> toDeepImmutableMap(
        Iterable<Entry<Node, List<Throwable>>> errors) {
      ImmutableMap.Builder<Node, List<Throwable>> builder = ImmutableMap.builder();
      for (Entry<Node, List<Throwable>> entry : errors) {
        builder.put(entry.getKey(), ImmutableList.copyOf(entry.getValue()));
      }
      return builder.build();
    }
  }
  