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The official Couchbase JVM Core IO Library
There is a newer version: 2.7.0
/*
 * 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.attribute(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";
  }

}