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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.stream.StreamSupport;
import javax.annotation.Nullable;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;
import com.google.common.collect.MapDifference;
import org.apache.cassandra.diag.DiagnosticEvent;
import org.apache.cassandra.utils.Collectors3;
public final class SchemaEvent extends DiagnosticEvent
{
private final SchemaEventType type;
private final ImmutableCollection keyspaces;
private final ImmutableMap indexTables;
private final ImmutableCollection tables;
private final ImmutableCollection nonSystemKeyspaces;
private final ImmutableCollection userKeyspaces;
private final int numberOfTables;
private final UUID version;
@Nullable
private final KeyspaceMetadata ksUpdate;
@Nullable
private final KeyspaceMetadata previous;
@Nullable
private final KeyspaceMetadata.KeyspaceDiff ksDiff;
@Nullable
private final TableMetadata tableUpdate;
@Nullable
private final Tables.TablesDiff tablesDiff;
@Nullable
private final Views.ViewsDiff viewsDiff;
@Nullable
private final MapDifference indexesDiff;
public enum SchemaEventType
{
KS_METADATA_LOADED,
KS_METADATA_RELOADED,
KS_METADATA_REMOVED,
VERSION_UPDATED,
VERSION_ANOUNCED,
KS_CREATING,
KS_CREATED,
KS_ALTERING,
KS_ALTERED,
KS_DROPPING,
KS_DROPPED,
TABLE_CREATING,
TABLE_CREATED,
TABLE_ALTERING,
TABLE_ALTERED,
TABLE_DROPPING,
TABLE_DROPPED,
SCHEMATA_LOADING,
SCHEMATA_LOADED,
SCHEMATA_CLEARED
}
SchemaEvent(SchemaEventType type, Schema schema, @Nullable KeyspaceMetadata ksUpdate,
@Nullable KeyspaceMetadata previous, @Nullable KeyspaceMetadata.KeyspaceDiff ksDiff,
@Nullable TableMetadata tableUpdate, @Nullable Tables.TablesDiff tablesDiff,
@Nullable Views.ViewsDiff viewsDiff, @Nullable MapDifference indexesDiff)
{
this.type = type;
this.ksUpdate = ksUpdate;
this.previous = previous;
this.ksDiff = ksDiff;
this.tableUpdate = tableUpdate;
this.tablesDiff = tablesDiff;
this.viewsDiff = viewsDiff;
this.indexesDiff = indexesDiff;
this.keyspaces = schema.getKeyspaces().immutableCopy();
this.nonSystemKeyspaces = schema.distributedKeyspaces().names();
this.userKeyspaces = schema.getUserKeyspaces().immutableCopy();
this.numberOfTables = schema.getNumberOfTables();
this.version = schema.getVersion(); // TODO: rename this field to reflect that the schema version we know here is stale (before the entire transformation started)
this.indexTables = schema.distributedKeyspaces().stream()
.flatMap(ks -> ks.tables.indexTables().entrySet().stream())
.collect(Collectors3.toImmutableMap(e -> String.format("%s,%s", e.getValue().keyspace, e.getKey()),
e -> String.format("%s,%s,%s", e.getValue().id.toHexString(), e.getValue().keyspace, e.getValue().name)));
this.tables = schema.distributedKeyspaces().stream()
.flatMap(ks -> StreamSupport.stream(ks.tablesAndViews().spliterator(), false))
.map(e -> String.format("%s,%s,%s", e.id.toHexString(), e.keyspace, e.name))
.collect(Collectors3.toImmutableList());
}
public SchemaEventType getType()
{
return type;
}
public Map toMap()
{
HashMap ret = new HashMap<>();
ret.put("keyspaces", this.keyspaces);
ret.put("nonSystemKeyspaces", this.nonSystemKeyspaces);
ret.put("userKeyspaces", this.userKeyspaces);
ret.put("numberOfTables", this.numberOfTables);
ret.put("version", this.version);
ret.put("tables", this.tables);
ret.put("indexTables", this.indexTables);
if (ksUpdate != null) ret.put("ksMetadataUpdate", repr(ksUpdate));
if (previous != null) ret.put("ksMetadataPrevious", repr(previous));
if (ksDiff != null)
{
HashMap ks = new HashMap<>();
ks.put("before", repr(ksDiff.before));
ks.put("after", repr(ksDiff.after));
ks.put("tables", repr(ksDiff.tables));
ks.put("views", repr(ksDiff.views));
ks.put("types", repr(ksDiff.types));
ks.put("udas", repr(ksDiff.udas));
ks.put("udfs", repr(ksDiff.udfs));
ret.put("ksDiff", ks);
}
if (tableUpdate != null) ret.put("tableMetadataUpdate", repr(tableUpdate));
if (tablesDiff != null) ret.put("tablesDiff", repr(tablesDiff));
if (viewsDiff != null) ret.put("viewsDiff", repr(viewsDiff));
if (indexesDiff != null) ret.put("indexesDiff", Lists.newArrayList(indexesDiff.entriesDiffering().keySet()));
return ret;
}
private HashMap repr(Diff diff)
{
HashMap ret = new HashMap<>();
if (diff.created != null) ret.put("created", diff.created.toString());
if (diff.dropped != null) ret.put("dropped", diff.dropped.toString());
if (diff.altered != null)
ret.put("created", Lists.newArrayList(diff.altered.stream().map(Diff.Altered::toString).iterator()));
return ret;
}
private HashMap repr(KeyspaceMetadata ksm)
{
HashMap ret = new HashMap<>();
ret.put("name", ksm.name);
if (ksm.kind != null) ret.put("kind", ksm.kind.name());
if (ksm.params != null) ret.put("params", ksm.params.toString());
if (ksm.tables != null) ret.put("tables", ksm.tables.toString());
if (ksm.views != null) ret.put("views", ksm.views.toString());
if (ksm.functions != null) ret.put("functions", ksm.functions.toString());
if (ksm.types != null) ret.put("types", ksm.types.toString());
return ret;
}
private HashMap repr(TableMetadata table)
{
HashMap ret = new HashMap<>();
ret.put("id", table.id.toHexString());
ret.put("name", table.name);
ret.put("keyspace", table.keyspace);
ret.put("partitioner", table.partitioner.toString());
ret.put("kind", table.kind.name());
ret.put("flags", Lists.newArrayList(table.flags.stream().map(Enum::name).iterator()));
ret.put("params", repr(table.params));
ret.put("indexes", Lists.newArrayList(table.indexes.stream().map(this::repr).iterator()));
ret.put("triggers", Lists.newArrayList(repr(table.triggers)));
ret.put("columns", Lists.newArrayList(table.columns.values().stream().map(this::repr).iterator()));
ret.put("droppedColumns", Lists.newArrayList(table.droppedColumns.values().stream().map(this::repr).iterator()));
ret.put("isCompactTable", table.isCompactTable());
ret.put("isCompound", TableMetadata.Flag.isCompound(table.flags));
ret.put("isCounter", table.isCounter());
ret.put("isCQLTable", TableMetadata.Flag.isCQLTable(table.flags));
ret.put("isDense", TableMetadata.Flag.isDense(table.flags));
ret.put("isIndex", table.isIndex());
ret.put("isStaticCompactTable", TableMetadata.Flag.isStaticCompactTable(table.flags));
ret.put("isView", table.isView());
ret.put("isVirtual", table.isVirtual());
return ret;
}
private HashMap repr(TableParams params)
{
HashMap ret = new HashMap<>();
if (params == null) return ret;
ret.put("minIndexInterval", params.minIndexInterval);
ret.put("maxIndexInterval", params.maxIndexInterval);
ret.put("defaultTimeToLive", params.defaultTimeToLive);
ret.put("gcGraceSeconds", params.gcGraceSeconds);
ret.put("bloomFilterFpChance", params.bloomFilterFpChance);
ret.put("cdc", params.cdc);
ret.put("crcCheckChance", params.crcCheckChance);
ret.put("memtableFlushPeriodInMs", params.memtableFlushPeriodInMs);
ret.put("comment", params.comment);
ret.put("caching", repr(params.caching));
ret.put("compaction", repr(params.compaction));
ret.put("compression", repr(params.compression));
ret.put("memtable", repr(params.memtable));
if (params.speculativeRetry != null) ret.put("speculativeRetry", params.speculativeRetry.kind().name());
return ret;
}
private HashMap repr(CachingParams caching)
{
HashMap ret = new HashMap<>();
if (caching == null) return ret;
ret.putAll(caching.asMap());
return ret;
}
private HashMap repr(CompactionParams comp)
{
HashMap ret = new HashMap<>();
if (comp == null) return ret;
ret.putAll(comp.asMap());
return ret;
}
private HashMap repr(CompressionParams compr)
{
HashMap ret = new HashMap<>();
if (compr == null) return ret;
ret.putAll(compr.asMap());
return ret;
}
private String repr(MemtableParams params)
{
return params.configurationKey();
}
private HashMap repr(IndexMetadata index)
{
HashMap ret = new HashMap<>();
if (index == null) return ret;
ret.put("name", index.name);
ret.put("kind", index.kind.name());
ret.put("id", index.id);
ret.put("options", new HashMap<>(index.options));
ret.put("isCustom", index.isCustom());
ret.put("isKeys", index.isKeys());
ret.put("isComposites", index.isComposites());
return ret;
}
private List> repr(Triggers triggers)
{
List> ret = new ArrayList<>();
if (triggers == null) return ret;
Iterator iter = triggers.iterator();
while (iter.hasNext()) ret.add(repr(iter.next()));
return ret;
}
private HashMap repr(TriggerMetadata trigger)
{
HashMap ret = new HashMap<>();
if (trigger == null) return ret;
ret.put("name", trigger.name);
ret.put("classOption", trigger.classOption);
return ret;
}
private HashMap repr(ColumnMetadata col)
{
HashMap ret = new HashMap<>();
if (col == null) return ret;
ret.put("name", col.name.toString());
ret.put("kind", col.kind.name());
ret.put("type", col.type.toString());
ret.put("ksName", col.ksName);
ret.put("cfName", col.cfName);
ret.put("position", col.position());
ret.put("clusteringOrder", col.clusteringOrder().name());
ret.put("isComplex", col.isComplex());
ret.put("isStatic", col.isStatic());
ret.put("isPrimaryKeyColumn", col.isPrimaryKeyColumn());
ret.put("isSimple", col.isSimple());
ret.put("isPartitionKey", col.isPartitionKey());
ret.put("isClusteringColumn", col.isClusteringColumn());
ret.put("isCounterColumn", col.isCounterColumn());
ret.put("isRegular", col.isRegular());
return ret;
}
private HashMap repr(DroppedColumn column)
{
HashMap ret = new HashMap<>();
if (column == null) return ret;
ret.put("droppedTime", column.droppedTime);
ret.put("column", repr(column.column));
return ret;
}
}