| /* |
| * 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.cassandra.exceptions; |
| |
| import java.io.IOException; |
| |
| import com.google.common.primitives.Ints; |
| |
| import org.apache.cassandra.db.filter.TombstoneOverwhelmingException; |
| import org.apache.cassandra.io.IVersionedSerializer; |
| import org.apache.cassandra.io.util.DataInputPlus; |
| import org.apache.cassandra.io.util.DataOutputPlus; |
| import org.apache.cassandra.utils.vint.VIntCoding; |
| |
| import static java.lang.Math.max; |
| import static org.apache.cassandra.net.MessagingService.VERSION_40; |
| |
| public enum RequestFailureReason |
| { |
| UNKNOWN (0), |
| READ_TOO_MANY_TOMBSTONES (1), |
| TIMEOUT (2), |
| INCOMPATIBLE_SCHEMA (3); |
| |
| public static final Serializer serializer = new Serializer(); |
| |
| public final int code; |
| |
| RequestFailureReason(int code) |
| { |
| this.code = code; |
| } |
| |
| private static final RequestFailureReason[] codeToReasonMap; |
| |
| static |
| { |
| RequestFailureReason[] reasons = values(); |
| |
| int max = -1; |
| for (RequestFailureReason r : reasons) |
| max = max(r.code, max); |
| |
| RequestFailureReason[] codeMap = new RequestFailureReason[max + 1]; |
| |
| for (RequestFailureReason reason : reasons) |
| { |
| if (codeMap[reason.code] != null) |
| throw new RuntimeException("Two RequestFailureReason-s that map to the same code: " + reason.code); |
| codeMap[reason.code] = reason; |
| } |
| |
| codeToReasonMap = codeMap; |
| } |
| |
| public static RequestFailureReason fromCode(int code) |
| { |
| if (code < 0) |
| throw new IllegalArgumentException("RequestFailureReason code must be non-negative (got " + code + ')'); |
| |
| // be forgiving and return UNKNOWN if we aren't aware of the code - for forward compatibility |
| return code < codeToReasonMap.length ? codeToReasonMap[code] : UNKNOWN; |
| } |
| |
| public static RequestFailureReason forException(Throwable t) |
| { |
| if (t instanceof TombstoneOverwhelmingException) |
| return READ_TOO_MANY_TOMBSTONES; |
| |
| if (t instanceof IncompatibleSchemaException) |
| return INCOMPATIBLE_SCHEMA; |
| |
| return UNKNOWN; |
| } |
| |
| public static final class Serializer implements IVersionedSerializer<RequestFailureReason> |
| { |
| private Serializer() |
| { |
| } |
| |
| public void serialize(RequestFailureReason reason, DataOutputPlus out, int version) throws IOException |
| { |
| if (version < VERSION_40) |
| out.writeShort(reason.code); |
| else |
| out.writeUnsignedVInt(reason.code); |
| } |
| |
| public RequestFailureReason deserialize(DataInputPlus in, int version) throws IOException |
| { |
| return fromCode(version < VERSION_40 ? in.readUnsignedShort() : Ints.checkedCast(in.readUnsignedVInt())); |
| } |
| |
| public long serializedSize(RequestFailureReason reason, int version) |
| { |
| return version < VERSION_40 ? 2 : VIntCoding.computeVIntSize(reason.code); |
| } |
| } |
| } |