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The official Couchbase JVM Core IO Library
/*
* Copyright (c) 2018 Couchbase, Inc.
*
* 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.couchbase.client.core.msg.kv;
import com.couchbase.client.core.CoreContext;
import com.couchbase.client.core.cnc.CbTracing;
import com.couchbase.client.core.cnc.RequestSpan;
import com.couchbase.client.core.cnc.TracingIdentifiers;
import com.couchbase.client.core.deps.io.netty.buffer.ByteBuf;
import com.couchbase.client.core.deps.io.netty.buffer.ByteBufAllocator;
import com.couchbase.client.core.deps.io.netty.buffer.Unpooled;
import com.couchbase.client.core.deps.io.netty.util.ReferenceCountUtil;
import com.couchbase.client.core.env.CompressionConfig;
import com.couchbase.client.core.io.CollectionIdentifier;
import com.couchbase.client.core.io.netty.kv.KeyValueChannelContext;
import com.couchbase.client.core.io.netty.kv.MemcacheProtocol;
import com.couchbase.client.core.retry.RetryStrategy;
import java.time.Duration;
import java.util.Optional;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.cas;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.decodeStatus;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.extractToken;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.mutationFlexibleExtras;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noExtras;
public class PrependRequest extends BaseKeyValueRequest implements SyncDurabilityRequest {
private final byte[] content;
private final long cas;
private final Optional syncReplicationType;
public PrependRequest(Duration timeout, CoreContext ctx, CollectionIdentifier collectionIdentifier,
RetryStrategy retryStrategy, String key, byte[] content,
long cas, final Optional syncReplicationType, RequestSpan span) {
super(timeout, ctx, retryStrategy, key, collectionIdentifier, span);
this.content = content;
this.cas = cas;
this.syncReplicationType = syncReplicationType;
if (span != null && !CbTracing.isInternalSpan(span)) {
span.lowCardinalityAttribute(TracingIdentifiers.ATTR_OPERATION, TracingIdentifiers.SPAN_REQUEST_KV_PREPEND);
applyLevelOnSpan(syncReplicationType, span);
}
}
@Override
public ByteBuf encode(ByteBufAllocator alloc, int opaque, KeyValueChannelContext ctx) {
ByteBuf key = null;
ByteBuf content = null;
ByteBuf flexibleExtras = mutationFlexibleExtras(this, ctx, alloc, syncReplicationType);
try {
key = encodedKeyWithCollection(alloc, ctx);
byte datatype = 0;
CompressionConfig config = ctx.compressionConfig();
if (config != null && config.enabled() && this.content.length >= config.minSize()) {
ByteBuf maybeCompressed = MemcacheProtocol.tryCompression(this.content, config.minRatio());
if (maybeCompressed != null) {
datatype |= MemcacheProtocol.Datatype.SNAPPY.datatype();
content = maybeCompressed;
} else {
content = Unpooled.wrappedBuffer(this.content);
}
} else {
content = Unpooled.wrappedBuffer(this.content);
}
return MemcacheProtocol.flexibleRequest(alloc, MemcacheProtocol.Opcode.PREPEND, datatype, partition(),
opaque, cas, flexibleExtras, noExtras(), key, content);
} finally {
ReferenceCountUtil.release(key);
ReferenceCountUtil.release(content);
ReferenceCountUtil.release(flexibleExtras);
}
}
@Override
public PrependResponse decode(ByteBuf response, KeyValueChannelContext ctx) {
return new PrependResponse(
decodeStatus(response),
cas(response),
extractToken(ctx.mutationTokensEnabled(), partition(), response, ctx.bucket().get())
);
}
@Override
public Optional durabilityLevel() {
return syncReplicationType;
}
@Override
public String name() {
return "prepend";
}
}