kafka Stores 源码
kafka Stores 代码
文件路径：/streams/src/main/java/org/apache/kafka/streams/state/Stores.java
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* 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.kafka.streams.state;
import org.apache.kafka.common.serialization.Serde;
import org.apache.kafka.common.utils.Bytes;
import org.apache.kafka.common.utils.Time;
import org.apache.kafka.streams.state.internals.InMemoryKeyValueBytesStoreSupplier;
import org.apache.kafka.streams.state.internals.InMemorySessionBytesStoreSupplier;
import org.apache.kafka.streams.state.internals.InMemoryWindowBytesStoreSupplier;
import org.apache.kafka.streams.state.internals.KeyValueStoreBuilder;
import org.apache.kafka.streams.state.internals.MemoryNavigableLRUCache;
import org.apache.kafka.streams.state.internals.RocksDbKeyValueBytesStoreSupplier;
import org.apache.kafka.streams.state.internals.RocksDbSessionBytesStoreSupplier;
import org.apache.kafka.streams.state.internals.RocksDbWindowBytesStoreSupplier;
import org.apache.kafka.streams.state.internals.SessionStoreBuilder;
import org.apache.kafka.streams.state.internals.TimestampedKeyValueStoreBuilder;
import org.apache.kafka.streams.state.internals.TimestampedWindowStoreBuilder;
import org.apache.kafka.streams.state.internals.WindowStoreBuilder;
import java.time.Duration;
import java.util.Objects;
import static org.apache.kafka.streams.internals.ApiUtils.prepareMillisCheckFailMsgPrefix;
import static org.apache.kafka.streams.internals.ApiUtils.validateMillisecondDuration;
/**
* Factory for creating state stores in Kafka Streams.
* <p>
* When using the high-level DSL, i.e., {@link org.apache.kafka.streams.StreamsBuilder StreamsBuilder}, users create
* {@link StoreSupplier}s that can be further customized via
* {@link org.apache.kafka.streams.kstream.Materialized Materialized}.
* For example, a topic read as {@link org.apache.kafka.streams.kstream.KTable KTable} can be materialized into an
* in-memory store with custom key/value serdes and caching disabled:
* <pre>{@code
* StreamsBuilder builder = new StreamsBuilder();
* KeyValueBytesStoreSupplier storeSupplier = Stores.inMemoryKeyValueStore("queryable-store-name");
* KTable<Long,String> table = builder.table(
* "topicName",
* Materialized.<Long,String>as(storeSupplier)
* .withKeySerde(Serdes.Long())
* .withValueSerde(Serdes.String())
* .withCachingDisabled());
* }</pre>
* When using the Processor API, i.e., {@link org.apache.kafka.streams.Topology Topology}, users create
* {@link StoreBuilder}s that can be attached to {@link org.apache.kafka.streams.processor.api.Processor Processor}s.
* For example, you can create a {@link org.apache.kafka.streams.kstream.Windowed windowed} RocksDB store with custom
* changelog topic configuration like:
* <pre>{@code
* Topology topology = new Topology();
* topology.addProcessor("processorName", ...);
*
* Map<String,String> topicConfig = new HashMap<>();
* StoreBuilder<WindowStore<Integer, Long>> storeBuilder = Stores
* .windowStoreBuilder(
* Stores.persistentWindowStore("queryable-store-name", ...),
* Serdes.Integer(),
* Serdes.Long())
* .withLoggingEnabled(topicConfig);
*
* topology.addStateStore(storeBuilder, "processorName");
* }</pre>
*/
public final class Stores {
/**
* Create a persistent {@link KeyValueBytesStoreSupplier}.
* <p>
* This store supplier can be passed into a {@link #keyValueStoreBuilder(KeyValueBytesStoreSupplier, Serde, Serde)}.
* If you want to create a {@link TimestampedKeyValueStore} you should use
* {@link #persistentTimestampedKeyValueStore(String)} to create a store supplier instead.
*
* @param name name of the store (cannot be {@code null})
* @return an instance of a {@link KeyValueBytesStoreSupplier} that can be used
* to build a persistent key-value store
*/
public static KeyValueBytesStoreSupplier persistentKeyValueStore(final String name) {
Objects.requireNonNull(name, "name cannot be null");
return new RocksDbKeyValueBytesStoreSupplier(name, false);
}
/**
* Create a persistent {@link KeyValueBytesStoreSupplier}.
* <p>
* This store supplier can be passed into a
* {@link #timestampedKeyValueStoreBuilder(KeyValueBytesStoreSupplier, Serde, Serde)}.
* If you want to create a {@link KeyValueStore} you should use
* {@link #persistentKeyValueStore(String)} to create a store supplier instead.
*
* @param name name of the store (cannot be {@code null})
* @return an instance of a {@link KeyValueBytesStoreSupplier} that can be used
* to build a persistent key-(timestamp/value) store
*/
public static KeyValueBytesStoreSupplier persistentTimestampedKeyValueStore(final String name) {
Objects.requireNonNull(name, "name cannot be null");
return new RocksDbKeyValueBytesStoreSupplier(name, true);
}
/**
* Create an in-memory {@link KeyValueBytesStoreSupplier}.
* <p>
* This store supplier can be passed into a {@link #keyValueStoreBuilder(KeyValueBytesStoreSupplier, Serde, Serde)}
* or {@link #timestampedKeyValueStoreBuilder(KeyValueBytesStoreSupplier, Serde, Serde)}.
*
* @param name name of the store (cannot be {@code null})
* @return an instance of a {@link KeyValueBytesStoreSupplier} than can be used to
* build an in-memory store
*/
public static KeyValueBytesStoreSupplier inMemoryKeyValueStore(final String name) {
Objects.requireNonNull(name, "name cannot be null");
return new InMemoryKeyValueBytesStoreSupplier(name);
}
/**
* Create a LRU Map {@link KeyValueBytesStoreSupplier}.
* <p>
* This store supplier can be passed into a {@link #keyValueStoreBuilder(KeyValueBytesStoreSupplier, Serde, Serde)}
* or {@link #timestampedKeyValueStoreBuilder(KeyValueBytesStoreSupplier, Serde, Serde)}.
*
* @param name name of the store (cannot be {@code null})
* @param maxCacheSize maximum number of items in the LRU (cannot be negative)
* @return an instance of a {@link KeyValueBytesStoreSupplier} that can be used to build
* an LRU Map based store
* @throws IllegalArgumentException if {@code maxCacheSize} is negative
*/
public static KeyValueBytesStoreSupplier lruMap(final String name, final int maxCacheSize) {
Objects.requireNonNull(name, "name cannot be null");
if (maxCacheSize < 0) {
throw new IllegalArgumentException("maxCacheSize cannot be negative");
}
return new KeyValueBytesStoreSupplier() {
@Override
public String name() {
return name;
}
@Override
public KeyValueStore<Bytes, byte[]> get() {
return new MemoryNavigableLRUCache(name, maxCacheSize);
}
@Override
public String metricsScope() {
return "in-memory-lru";
}
};
}
/**
* Create a persistent {@link WindowBytesStoreSupplier}.
* <p>
* This store supplier can be passed into a {@link #windowStoreBuilder(WindowBytesStoreSupplier, Serde, Serde)}.
* If you want to create a {@link TimestampedWindowStore} you should use
* {@link #persistentTimestampedWindowStore(String, Duration, Duration, boolean)} to create a store supplier instead.
*
* @param name name of the store (cannot be {@code null})
* @param retentionPeriod length of time to retain data in the store (cannot be negative)
* (note that the retention period must be at least long enough to contain the
* windowed data's entire life cycle, from window-start through window-end,
* and for the entire grace period)
* @param windowSize size of the windows (cannot be negative)
* @param retainDuplicates whether or not to retain duplicates. Turning this on will automatically disable
* caching and means that null values will be ignored.
* @return an instance of {@link WindowBytesStoreSupplier}
* @throws IllegalArgumentException if {@code retentionPeriod} or {@code windowSize} can't be represented as {@code long milliseconds}
* @throws IllegalArgumentException if {@code retentionPeriod} is smaller than {@code windowSize}
*/
public static WindowBytesStoreSupplier persistentWindowStore(final String name,
final Duration retentionPeriod,
final Duration windowSize,
final boolean retainDuplicates) throws IllegalArgumentException {
return persistentWindowStore(name, retentionPeriod, windowSize, retainDuplicates, false);
}
/**
* Create a persistent {@link WindowBytesStoreSupplier}.
* <p>
* This store supplier can be passed into a
* {@link #timestampedWindowStoreBuilder(WindowBytesStoreSupplier, Serde, Serde)}.
* If you want to create a {@link WindowStore} you should use
* {@link #persistentWindowStore(String, Duration, Duration, boolean)} to create a store supplier instead.
*
* @param name name of the store (cannot be {@code null})
* @param retentionPeriod length of time to retain data in the store (cannot be negative)
* (note that the retention period must be at least long enough to contain the
* windowed data's entire life cycle, from window-start through window-end,
* and for the entire grace period)
* @param windowSize size of the windows (cannot be negative)
* @param retainDuplicates whether or not to retain duplicates. Turning this on will automatically disable
* caching and means that null values will be ignored.
* @return an instance of {@link WindowBytesStoreSupplier}
* @throws IllegalArgumentException if {@code retentionPeriod} or {@code windowSize} can't be represented as {@code long milliseconds}
* @throws IllegalArgumentException if {@code retentionPeriod} is smaller than {@code windowSize}
*/
public static WindowBytesStoreSupplier persistentTimestampedWindowStore(final String name,
final Duration retentionPeriod,
final Duration windowSize,
final boolean retainDuplicates) throws IllegalArgumentException {
return persistentWindowStore(name, retentionPeriod, windowSize, retainDuplicates, true);
}
private static WindowBytesStoreSupplier persistentWindowStore(final String name,
final Duration retentionPeriod,
final Duration windowSize,
final boolean retainDuplicates,
final boolean timestampedStore) {
Objects.requireNonNull(name, "name cannot be null");
final String rpMsgPrefix = prepareMillisCheckFailMsgPrefix(retentionPeriod, "retentionPeriod");
final long retentionMs = validateMillisecondDuration(retentionPeriod, rpMsgPrefix);
final String wsMsgPrefix = prepareMillisCheckFailMsgPrefix(windowSize, "windowSize");
final long windowSizeMs = validateMillisecondDuration(windowSize, wsMsgPrefix);
final long defaultSegmentInterval = Math.max(retentionMs / 2, 60_000L);
return persistentWindowStore(name, retentionMs, windowSizeMs, retainDuplicates, defaultSegmentInterval, timestampedStore);
}
private static WindowBytesStoreSupplier persistentWindowStore(final String name,
final long retentionPeriod,
final long windowSize,
final boolean retainDuplicates,
final long segmentInterval,
final boolean timestampedStore) {
Objects.requireNonNull(name, "name cannot be null");
if (retentionPeriod < 0L) {
throw new IllegalArgumentException("retentionPeriod cannot be negative");
}
if (windowSize < 0L) {
throw new IllegalArgumentException("windowSize cannot be negative");
}
if (segmentInterval < 1L) {
throw new IllegalArgumentException("segmentInterval cannot be zero or negative");
}
if (windowSize > retentionPeriod) {
throw new IllegalArgumentException("The retention period of the window store "
+ name + " must be no smaller than its window size. Got size=["
+ windowSize + "], retention=[" + retentionPeriod + "]");
}
return new RocksDbWindowBytesStoreSupplier(
name,
retentionPeriod,
segmentInterval,
windowSize,
retainDuplicates,
timestampedStore);
}
/**
* Create an in-memory {@link WindowBytesStoreSupplier}.
* <p>
* This store supplier can be passed into a {@link #windowStoreBuilder(WindowBytesStoreSupplier, Serde, Serde)} or
* {@link #timestampedWindowStoreBuilder(WindowBytesStoreSupplier, Serde, Serde)}.
*
* @param name name of the store (cannot be {@code null})
* @param retentionPeriod length of time to retain data in the store (cannot be negative)
* Note that the retention period must be at least long enough to contain the
* windowed data's entire life cycle, from window-start through window-end,
* and for the entire grace period.
* @param windowSize size of the windows (cannot be negative)
* @param retainDuplicates whether or not to retain duplicates. Turning this on will automatically disable
* caching and means that null values will be ignored.
* @return an instance of {@link WindowBytesStoreSupplier}
* @throws IllegalArgumentException if {@code retentionPeriod} or {@code windowSize} can't be represented as {@code long milliseconds}
* @throws IllegalArgumentException if {@code retentionPeriod} is smaller than {@code windowSize}
*/
public static WindowBytesStoreSupplier inMemoryWindowStore(final String name,
final Duration retentionPeriod,
final Duration windowSize,
final boolean retainDuplicates) throws IllegalArgumentException {
Objects.requireNonNull(name, "name cannot be null");
final String repartitionPeriodErrorMessagePrefix = prepareMillisCheckFailMsgPrefix(retentionPeriod, "retentionPeriod");
final long retentionMs = validateMillisecondDuration(retentionPeriod, repartitionPeriodErrorMessagePrefix);
if (retentionMs < 0L) {
throw new IllegalArgumentException("retentionPeriod cannot be negative");
}
final String windowSizeErrorMessagePrefix = prepareMillisCheckFailMsgPrefix(windowSize, "windowSize");
final long windowSizeMs = validateMillisecondDuration(windowSize, windowSizeErrorMessagePrefix);
if (windowSizeMs < 0L) {
throw new IllegalArgumentException("windowSize cannot be negative");
}
if (windowSizeMs > retentionMs) {
throw new IllegalArgumentException("The retention period of the window store "
+ name + " must be no smaller than its window size. Got size=["
+ windowSize + "], retention=[" + retentionPeriod + "]");
}
return new InMemoryWindowBytesStoreSupplier(name, retentionMs, windowSizeMs, retainDuplicates);
}
/**
* Create a persistent {@link SessionBytesStoreSupplier}.
*
* @param name name of the store (cannot be {@code null})
* @param retentionPeriod length of time to retain data in the store (cannot be negative)
* (note that the retention period must be at least as long enough to
* contain the inactivity gap of the session and the entire grace period.)
* @return an instance of a {@link SessionBytesStoreSupplier}
*/
public static SessionBytesStoreSupplier persistentSessionStore(final String name,
final Duration retentionPeriod) {
Objects.requireNonNull(name, "name cannot be null");
final String msgPrefix = prepareMillisCheckFailMsgPrefix(retentionPeriod, "retentionPeriod");
final long retentionPeriodMs = validateMillisecondDuration(retentionPeriod, msgPrefix);
if (retentionPeriodMs < 0) {
throw new IllegalArgumentException("retentionPeriod cannot be negative");
}
return new RocksDbSessionBytesStoreSupplier(name, retentionPeriodMs);
}
/**
* Create an in-memory {@link SessionBytesStoreSupplier}.
*
* @param name name of the store (cannot be {@code null})
* @param retentionPeriod length ot time to retain data in the store (cannot be negative)
* (note that the retention period must be at least as long enough to
* contain the inactivity gap of the session and the entire grace period.)
* @return an instance of a {@link SessionBytesStoreSupplier}
*/
public static SessionBytesStoreSupplier inMemorySessionStore(final String name, final Duration retentionPeriod) {
Objects.requireNonNull(name, "name cannot be null");
final String msgPrefix = prepareMillisCheckFailMsgPrefix(retentionPeriod, "retentionPeriod");
final long retentionPeriodMs = validateMillisecondDuration(retentionPeriod, msgPrefix);
if (retentionPeriodMs < 0) {
throw new IllegalArgumentException("retentionPeriod cannot be negative");
}
return new InMemorySessionBytesStoreSupplier(name, retentionPeriodMs);
}
/**
* Creates a {@link StoreBuilder} that can be used to build a {@link KeyValueStore}.
* <p>
* The provided supplier should <strong>not</strong> be a supplier for
* {@link TimestampedKeyValueStore TimestampedKeyValueStores}.
*
* @param supplier a {@link KeyValueBytesStoreSupplier} (cannot be {@code null})
* @param keySerde the key serde to use
* @param valueSerde the value serde to use; if the serialized bytes is {@code null} for put operations,
* it is treated as delete
* @param <K> key type
* @param <V> value type
* @return an instance of a {@link StoreBuilder} that can build a {@link KeyValueStore}
*/
public static <K, V> StoreBuilder<KeyValueStore<K, V>> keyValueStoreBuilder(final KeyValueBytesStoreSupplier supplier,
final Serde<K> keySerde,
final Serde<V> valueSerde) {
Objects.requireNonNull(supplier, "supplier cannot be null");
return new KeyValueStoreBuilder<>(supplier, keySerde, valueSerde, Time.SYSTEM);
}
/**
* Creates a {@link StoreBuilder} that can be used to build a {@link TimestampedKeyValueStore}.
* <p>
* The provided supplier should <strong>not</strong> be a supplier for
* {@link KeyValueStore KeyValueStores}. For this case, passed in timestamps will be dropped and not stored in the
* key-value-store. On read, no valid timestamp but a dummy timestamp will be returned.
*
* @param supplier a {@link KeyValueBytesStoreSupplier} (cannot be {@code null})
* @param keySerde the key serde to use
* @param valueSerde the value serde to use; if the serialized bytes is {@code null} for put operations,
* it is treated as delete
* @param <K> key type
* @param <V> value type
* @return an instance of a {@link StoreBuilder} that can build a {@link KeyValueStore}
*/
public static <K, V> StoreBuilder<TimestampedKeyValueStore<K, V>> timestampedKeyValueStoreBuilder(final KeyValueBytesStoreSupplier supplier,
final Serde<K> keySerde,
final Serde<V> valueSerde) {
Objects.requireNonNull(supplier, "supplier cannot be null");
return new TimestampedKeyValueStoreBuilder<>(supplier, keySerde, valueSerde, Time.SYSTEM);
}
/**
* Creates a {@link StoreBuilder} that can be used to build a {@link WindowStore}.
* <p>
* The provided supplier should <strong>not</strong> be a supplier for
* {@link TimestampedWindowStore TimestampedWindowStores}.
*
* @param supplier a {@link WindowBytesStoreSupplier} (cannot be {@code null})
* @param keySerde the key serde to use
* @param valueSerde the value serde to use; if the serialized bytes is {@code null} for put operations,
* it is treated as delete
* @param <K> key type
* @param <V> value type
* @return an instance of {@link StoreBuilder} than can build a {@link WindowStore}
*/
public static <K, V> StoreBuilder<WindowStore<K, V>> windowStoreBuilder(final WindowBytesStoreSupplier supplier,
final Serde<K> keySerde,
final Serde<V> valueSerde) {
Objects.requireNonNull(supplier, "supplier cannot be null");
return new WindowStoreBuilder<>(supplier, keySerde, valueSerde, Time.SYSTEM);
}
/**
* Creates a {@link StoreBuilder} that can be used to build a {@link TimestampedWindowStore}.
* <p>
* The provided supplier should <strong>not</strong> be a supplier for
* {@link WindowStore WindowStores}. For this case, passed in timestamps will be dropped and not stored in the
* window-store. On read, no valid timestamp but a dummy timestamp will be returned.
*
* @param supplier a {@link WindowBytesStoreSupplier} (cannot be {@code null})
* @param keySerde the key serde to use
* @param valueSerde the value serde to use; if the serialized bytes is {@code null} for put operations,
* it is treated as delete
* @param <K> key type
* @param <V> value type
* @return an instance of {@link StoreBuilder} that can build a {@link TimestampedWindowStore}
*/
public static <K, V> StoreBuilder<TimestampedWindowStore<K, V>> timestampedWindowStoreBuilder(final WindowBytesStoreSupplier supplier,
final Serde<K> keySerde,
final Serde<V> valueSerde) {
Objects.requireNonNull(supplier, "supplier cannot be null");
return new TimestampedWindowStoreBuilder<>(supplier, keySerde, valueSerde, Time.SYSTEM);
}
/**
* Creates a {@link StoreBuilder} that can be used to build a {@link SessionStore}.
*
* @param supplier a {@link SessionBytesStoreSupplier} (cannot be {@code null})
* @param keySerde the key serde to use
* @param valueSerde the value serde to use; if the serialized bytes is {@code null} for put operations,
* it is treated as delete
* @param <K> key type
* @param <V> value type
* @return an instance of {@link StoreBuilder} than can build a {@link SessionStore}
*/
public static <K, V> StoreBuilder<SessionStore<K, V>> sessionStoreBuilder(final SessionBytesStoreSupplier supplier,
final Serde<K> keySerde,
final Serde<V> valueSerde) {
Objects.requireNonNull(supplier, "supplier cannot be null");
return new SessionStoreBuilder<>(supplier, keySerde, valueSerde, Time.SYSTEM);
}
}
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