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DialogueNodeSelectionStrategy.java
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DialogueNodeSelectionStrategy.java
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/*
* (c) Copyright 2020 Palantir Technologies Inc. All rights reserved.
*
* 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.palantir.dialogue.core;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.palantir.conjure.java.client.config.NodeSelectionStrategy;
import com.palantir.logsafe.SafeArg;
import com.palantir.logsafe.exceptions.SafeIllegalStateException;
import com.palantir.logsafe.logger.SafeLogger;
import com.palantir.logsafe.logger.SafeLoggerFactory;
import java.util.List;
/**
* Supported node selection strategies which can either be user provided or received over the wire from servers.
* Separate from {@link NodeSelectionStrategy} to allow us to more easily iterate on strategies and support unknown
* strategies coming in over the wire.
*/
enum DialogueNodeSelectionStrategy {
PIN_UNTIL_ERROR,
PIN_UNTIL_ERROR_WITHOUT_RESHUFFLE,
BALANCED,
UNKNOWN;
private static final SafeLogger log = SafeLoggerFactory.get(DialogueNodeSelectionStrategy.class);
private static final Splitter SPLITTER = Splitter.on(",").trimResults().omitEmptyStrings();
static List<DialogueNodeSelectionStrategy> fromHeader(String header) {
return ImmutableList.copyOf(
Lists.transform(SPLITTER.splitToList(header), DialogueNodeSelectionStrategy::safeValueOf));
}
/**
* We allow server-determined headers to access some incubating dialogue-specific strategies (e.g. BALANCED_RTT)
* which users can't normally configure.
*/
private static DialogueNodeSelectionStrategy safeValueOf(String string) {
if ("PIN_UNTIL_ERROR".equalsIgnoreCase(string)) {
return PIN_UNTIL_ERROR;
}
if ("PIN_UNTIL_ERROR_WITHOUT_RESHUFFLE".equalsIgnoreCase(string)) {
return PIN_UNTIL_ERROR_WITHOUT_RESHUFFLE;
}
if ("BALANCED".equalsIgnoreCase(string)) {
return BALANCED;
}
log.info("Received unknown selection strategy {}", SafeArg.of("strategy", string));
return UNKNOWN;
}
static DialogueNodeSelectionStrategy of(NodeSelectionStrategy strategy) {
switch (strategy) {
case PIN_UNTIL_ERROR:
return PIN_UNTIL_ERROR;
case PIN_UNTIL_ERROR_WITHOUT_RESHUFFLE:
return PIN_UNTIL_ERROR_WITHOUT_RESHUFFLE;
case ROUND_ROBIN:
return BALANCED;
}
throw new SafeIllegalStateException("Unknown node selection strategy", SafeArg.of("strategy", strategy));
}
}