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Reactive Relational Database Connectivity Driver Implementation for Postgresql
/*
* Copyright 2017 the original author or authors.
*
* 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
*
* https://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 io.r2dbc.postgresql.codec;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufAllocator;
import io.r2dbc.postgresql.client.Parameter;
import io.r2dbc.postgresql.message.Format;
import io.r2dbc.postgresql.util.Assert;
import reactor.util.annotation.Nullable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.Function;
/**
* The default {@link Codec} implementation. Delegates to type-specific codec implementations.
* Codecs can be configured to prefer or avoid attached buffers for certain data types. Using attached buffers is more memory-efficient as data doesn't need to be copied. In turn, attached
* buffers require release or consumption to avoid memory leaks. By default, codecs don't use attached buffers to minimize the risk of memory leaks.
*/
public final class DefaultCodecs implements Codecs, CodecRegistry {
private final List> codecs;
private final CodecLookup codecLookup;
/**
* Create a new instance of {@link DefaultCodecs} preferring detached (copied buffers).
*
* @param byteBufAllocator the {@link ByteBufAllocator} to use for encoding
*/
public DefaultCodecs(ByteBufAllocator byteBufAllocator) {
this(byteBufAllocator, false);
}
/**
* Create a new instance of {@link DefaultCodecs} preferring detached (copied buffers).
*
* @param byteBufAllocator the {@link ByteBufAllocator} to use for encoding
* @param preferAttachedBuffers whether to prefer attached (pooled) {@link ByteBuf buffers}. Use {@code false} (default) to use detached buffers which minimize the risk of memory leaks.
*/
public DefaultCodecs(ByteBufAllocator byteBufAllocator, boolean preferAttachedBuffers) {
this(byteBufAllocator, preferAttachedBuffers, CachedCodecLookup::new);
}
/**
* Create a new instance of {@link DefaultCodecs}.
*
* @param byteBufAllocator the {@link ByteBufAllocator} to use for encoding
* @param preferAttachedBuffers whether to prefer attached (pooled) {@link ByteBuf buffers}. Use {@code false} (default) to use detached buffers which minimize the risk of memory leaks.
* @param codecLookupFunction provides the {@link CodecLookup} to use for finding relevant codecs
*/
DefaultCodecs(ByteBufAllocator byteBufAllocator, boolean preferAttachedBuffers, Function codecLookupFunction) {
Assert.requireNonNull(byteBufAllocator, "byteBufAllocator must not be null");
Assert.requireNonNull(codecLookupFunction, "codecLookupFunction must not be null");
this.codecLookup = codecLookupFunction.apply(this);
this.codecs = getDefaultCodecs(byteBufAllocator, preferAttachedBuffers);
this.codecLookup.afterCodecAdded();
}
@SuppressWarnings({"unchecked", "rawtypes"})
private static List> getDefaultCodecs(ByteBufAllocator byteBufAllocator, boolean preferAttachedBuffers) {
List> codecs = new CopyOnWriteArrayList<>(Arrays.asList(
// Prioritized Codecs
new StringCodec(byteBufAllocator),
new InstantCodec(byteBufAllocator),
new ZonedDateTimeCodec(byteBufAllocator),
new BinaryByteBufferCodec(byteBufAllocator),
new BinaryByteArrayCodec(byteBufAllocator),
new BigDecimalCodec(byteBufAllocator),
new BigIntegerCodec(byteBufAllocator),
new BooleanCodec(byteBufAllocator),
new CharacterCodec(byteBufAllocator),
new DoubleCodec(byteBufAllocator),
new FloatCodec(byteBufAllocator),
new InetAddressCodec(byteBufAllocator),
new IntegerCodec(byteBufAllocator),
new IntervalCodec(byteBufAllocator),
new LocalDateCodec(byteBufAllocator),
new LocalDateTimeCodec(byteBufAllocator),
new LocalTimeCodec(byteBufAllocator),
new LongCodec(byteBufAllocator),
new OffsetDateTimeCodec(byteBufAllocator),
new OffsetTimeCodec(byteBufAllocator),
new ShortCodec(byteBufAllocator),
new UriCodec(byteBufAllocator),
new UrlCodec(byteBufAllocator),
new UuidCodec(byteBufAllocator),
new ZoneIdCodec(byteBufAllocator),
// JSON
new JsonCodec(byteBufAllocator, preferAttachedBuffers),
new JsonByteArrayCodec(byteBufAllocator),
new JsonByteBufCodec(byteBufAllocator),
new JsonByteBufferCodec(byteBufAllocator),
new JsonInputStreamCodec(byteBufAllocator),
new JsonStringCodec(byteBufAllocator),
// Fallback for Object.class
new ByteCodec(byteBufAllocator),
new DateCodec(byteBufAllocator),
new BlobCodec(byteBufAllocator),
new ClobCodec(byteBufAllocator),
new BooleanArrayCodec(byteBufAllocator),
new BigDecimalArrayCodec(byteBufAllocator),
new ShortArrayCodec(byteBufAllocator),
new StringArrayCodec(byteBufAllocator),
new IntegerArrayCodec(byteBufAllocator),
new LongArrayCodec(byteBufAllocator),
new FloatArrayCodec(byteBufAllocator),
new DoubleArrayCodec(byteBufAllocator),
new UuidArrayCodec(byteBufAllocator),
//Geometry
new CircleCodec(byteBufAllocator),
new PointCodec(byteBufAllocator),
new BoxCodec(byteBufAllocator),
new LineCodec(byteBufAllocator),
new LsegCodec(byteBufAllocator),
new PathCodec(byteBufAllocator),
new PolygonCodec(byteBufAllocator)
));
return codecs;
}
@Override
public void addFirst(Codec codec) {
Assert.requireNonNull(codec, "codec must not be null");
this.codecs.add(0, codec);
this.codecLookup.afterCodecAdded();
}
@Override
public void addLast(Codec codec) {
Assert.requireNonNull(codec, "codec must not be null");
this.codecs.add(codec);
this.codecLookup.afterCodecAdded();
}
@Override
@Nullable
public T decode(@Nullable ByteBuf buffer, int dataType, Format format, Class type) {
Assert.requireNonNull(format, "format must not be null");
Assert.requireNonNull(type, "type must not be null");
if (buffer == null) {
return null;
}
Codec codec = this.codecLookup.findDecodeCodec(dataType, format, type);
if (codec != null) {
return codec.decode(buffer, dataType, format, type);
}
throw new IllegalArgumentException(String.format("Cannot decode value of type %s with OID %d", type.getName(), dataType));
}
@Override
public Parameter encode(Object value) {
Assert.requireNonNull(value, "value must not be null");
Codec codec = this.codecLookup.findEncodeCodec(value);
if (codec != null) {
return codec.encode(value);
}
throw new IllegalArgumentException(String.format("Cannot encode parameter of type %s", value.getClass().getName()));
}
@Override
public Parameter encodeNull(Class type) {
Assert.requireNonNull(type, "type must not be null");
Codec codec = this.codecLookup.findEncodeNullCodec(type);
if (codec != null) {
return codec.encodeNull();
}
throw new IllegalArgumentException(String.format("Cannot encode null parameter of type %s", type.getName()));
}
@Override
public Class preferredType(int dataType, Format format) {
Assert.requireNonNull(format, "format must not be null");
Codec codec = this.codecLookup.findDecodeCodec(dataType, format, Object.class);
if (codec instanceof CodecMetadata) {
return ((CodecMetadata) codec).type();
}
return null;
}
@Override
public Iterator> iterator() {
return Collections.unmodifiableList(new ArrayList<>(this.codecs)).iterator();
}
}