| /* |
| * 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.schema; |
| |
| import java.text.DecimalFormat; |
| import java.util.concurrent.TimeUnit; |
| |
| import com.google.common.base.Objects; |
| |
| import org.apache.cassandra.exceptions.ConfigurationException; |
| |
| import static java.lang.String.format; |
| |
| public final class SpeculativeRetryParam |
| { |
| public enum Kind |
| { |
| NONE, CUSTOM, PERCENTILE, ALWAYS |
| } |
| |
| public static final SpeculativeRetryParam NONE = none(); |
| public static final SpeculativeRetryParam ALWAYS = always(); |
| public static final SpeculativeRetryParam DEFAULT = percentile(99); |
| |
| private final Kind kind; |
| private final double value; |
| |
| // pre-processed (divided by 100 for PERCENTILE), multiplied by 1M for CUSTOM (to nanos) |
| private final double threshold; |
| |
| private SpeculativeRetryParam(Kind kind, double value) |
| { |
| this.kind = kind; |
| this.value = value; |
| |
| if (kind == Kind.PERCENTILE) |
| threshold = value / 100; |
| else if (kind == Kind.CUSTOM) |
| threshold = TimeUnit.MILLISECONDS.toNanos((long) value); |
| else |
| threshold = value; |
| } |
| |
| public Kind kind() |
| { |
| return kind; |
| } |
| |
| public double threshold() |
| { |
| return threshold; |
| } |
| |
| public static SpeculativeRetryParam none() |
| { |
| return new SpeculativeRetryParam(Kind.NONE, 0); |
| } |
| |
| public static SpeculativeRetryParam always() |
| { |
| return new SpeculativeRetryParam(Kind.ALWAYS, 0); |
| } |
| |
| public static SpeculativeRetryParam custom(double value) |
| { |
| return new SpeculativeRetryParam(Kind.CUSTOM, value); |
| } |
| |
| public static SpeculativeRetryParam percentile(double value) |
| { |
| return new SpeculativeRetryParam(Kind.PERCENTILE, value); |
| } |
| |
| public static SpeculativeRetryParam fromString(String value) |
| { |
| if (value.toLowerCase().endsWith("ms")) |
| { |
| try |
| { |
| return custom(Double.parseDouble(value.substring(0, value.length() - "ms".length()))); |
| } |
| catch (IllegalArgumentException e) |
| { |
| throw new ConfigurationException(format("Invalid value %s for option '%s'", value, TableParams.Option.SPECULATIVE_RETRY)); |
| } |
| } |
| |
| if (value.toUpperCase().endsWith(Kind.PERCENTILE.toString())) |
| { |
| double threshold; |
| try |
| { |
| threshold = Double.parseDouble(value.substring(0, value.length() - Kind.PERCENTILE.toString().length())); |
| } |
| catch (IllegalArgumentException e) |
| { |
| throw new ConfigurationException(format("Invalid value %s for option '%s'", value, TableParams.Option.SPECULATIVE_RETRY)); |
| } |
| |
| if (threshold >= 0.0 && threshold <= 100.0) |
| return percentile(threshold); |
| |
| throw new ConfigurationException(format("Invalid value %s for PERCENTILE option '%s': must be between 0.0 and 100.0", |
| value, |
| TableParams.Option.SPECULATIVE_RETRY)); |
| } |
| |
| if (value.equals(Kind.NONE.toString())) |
| return NONE; |
| |
| if (value.equals(Kind.ALWAYS.toString())) |
| return ALWAYS; |
| |
| throw new ConfigurationException(format("Invalid value %s for option '%s'", value, TableParams.Option.SPECULATIVE_RETRY)); |
| } |
| |
| @Override |
| public boolean equals(Object o) |
| { |
| if (!(o instanceof SpeculativeRetryParam)) |
| return false; |
| SpeculativeRetryParam srp = (SpeculativeRetryParam) o; |
| return kind == srp.kind && threshold == srp.threshold; |
| } |
| |
| @Override |
| public int hashCode() |
| { |
| return Objects.hashCode(kind, threshold); |
| } |
| |
| @Override |
| public String toString() |
| { |
| switch (kind) |
| { |
| case CUSTOM: |
| return format("%sms", value); |
| case PERCENTILE: |
| return format("%sPERCENTILE", new DecimalFormat("#.#####").format(value)); |
| default: // NONE and ALWAYS |
| return kind.toString(); |
| } |
| } |
| } |