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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.prelude.fastsearch;
import com.google.common.collect.ImmutableMap;
import com.yahoo.slime.BinaryFormat;
import com.yahoo.data.access.Inspector;
import com.yahoo.slime.Slime;
import com.yahoo.data.access.slime.SlimeAdapter;
import com.yahoo.prelude.ConfigurationException;
import com.yahoo.container.search.LegacyEmulationConfig;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;
import java.util.stream.Collectors;
import static com.yahoo.data.access.Type.OBJECT;
/**
* A set of docsum definitions
*
* @author bratseth
* @author Bjørn Borud
*/
public final class DocsumDefinitionSet {
public static final int SLIME_MAGIC_ID = 0x55555555;
private final static Logger log = Logger.getLogger(DocsumDefinitionSet.class.getName());
private final Map<String, DocsumDefinition> definitionsByName;
private final LegacyEmulationConfig emulationConfig;
public DocsumDefinitionSet(DocumentdbInfoConfig.Documentdb config) {
this(config, new LegacyEmulationConfig(new LegacyEmulationConfig.Builder()));
}
public DocsumDefinitionSet(DocumentdbInfoConfig.Documentdb config, LegacyEmulationConfig emulConfig) {
this(toDocsums(config, emulConfig), emulConfig);
}
public DocsumDefinitionSet(Collection<DocsumDefinition> docsumDefinitions) {
this(docsumDefinitions, new LegacyEmulationConfig(new LegacyEmulationConfig.Builder()));
}
public DocsumDefinitionSet(Collection<DocsumDefinition> docsumDefinitions, LegacyEmulationConfig emulConfig) {
this.definitionsByName = ImmutableMap.copyOf(docsumDefinitions.stream().collect(Collectors.toMap(DocsumDefinition::getName, p -> p)));
this.emulationConfig = emulConfig;
}
LegacyEmulationConfig legacyEmulationConfig() { return emulationConfig; }
/**
* Returns a docsum definition by name, or null if not found
*
* @param name the name of the summary class to use, or null to use the name "default"
* @return the summary class found, or null if none
*/
public final DocsumDefinition getDocsumDefinition(String name) {
if (name == null)
name="default";
return definitionsByName.get(name);
}
/**
* Makes data available for decoding for the given hit.
*
* @param summaryClass the requested summary class
* @param data docsum data from backend
* @param hit the Hit corresponding to this document summary
* @return Error message or null on success.
* @throws ConfigurationException if the summary class of this hit is missing
*/
public final String lazyDecode(String summaryClass, byte[] data, FastHit hit) {
ByteBuffer buffer = ByteBuffer.wrap(data);
buffer.order(ByteOrder.LITTLE_ENDIAN);
long docsumClassId = buffer.getInt();
if (docsumClassId != SLIME_MAGIC_ID) {
throw new IllegalArgumentException("Only expecting SchemaLess docsums - summary class:" + summaryClass + " hit:" + hit);
}
DocsumDefinition docsumDefinition = lookupDocsum(summaryClass);
Slime value = BinaryFormat.decode(buffer.array(), buffer.arrayOffset()+buffer.position(), buffer.remaining());
Inspector docsum = new SlimeAdapter(value.get());
if (docsum.type() != OBJECT) {
return "Hit " + hit + " failed: " + docsum.asString();
}
hit.addSummary(docsumDefinition, docsum);
return null;
}
private DocsumDefinition lookupDocsum(String summaryClass) {
DocsumDefinition ds = definitionsByName.get(summaryClass);
if (ds == null) {
ds = definitionsByName.get("default");
}
if (ds == null) {
throw new ConfigurationException("Fetched hit with summary class " + summaryClass +
", but this summary class is not in current summary config (" + toString() + ")" +
" (that is, you asked for something unknown, and no default was found)");
}
return ds;
}
public String toString() {
StringBuilder sb = new StringBuilder();
for (Map.Entry<String, DocsumDefinition> e : definitionsByName.entrySet() ) {
if (sb.length() != 0) {
sb.append(",");
}
sb.append("[").append(e.getKey()).append(",").append(e.getValue().getName()).append("]");
}
return sb.toString();
}
public int size() {
return definitionsByName.size();
}
private static Collection<DocsumDefinition> toDocsums(DocumentdbInfoConfig.Documentdb config, LegacyEmulationConfig emulConfig) {
Collection<DocsumDefinition> docsums = new ArrayList<>();
for (int i = 0; i < config.summaryclass().size(); ++i)
docsums.add(new DocsumDefinition(config.summaryclass(i), emulConfig));
if (docsums.isEmpty())
log.warning("No summary classes found in DocumentdbInfoConfig.Documentdb");
return docsums;
}
}
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