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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.util.ReferenceCountUtil;
import com.couchbase.client.core.error.InvalidArgumentException;
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.body;
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.noBody;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noCas;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.noDatatype;
public class DecrementRequest extends BaseKeyValueRequest implements SyncDurabilityRequest {
private final long delta;
private final Optional initial;
private final long expiry;
private final Optional syncReplicationType;
public DecrementRequest(Duration timeout, CoreContext ctx, CollectionIdentifier collectionIdentifier,
RetryStrategy retryStrategy, String key,
long delta, Optional initial, long expiry,
final Optional syncReplicationType, RequestSpan span) {
super(timeout, ctx, retryStrategy, key, collectionIdentifier, span);
if (initial.isPresent() && initial.get() < 0) {
throw InvalidArgumentException.fromMessage("The initial needs to be >= 0");
}
this.delta = delta;
this.initial = initial;
this.expiry = expiry;
this.syncReplicationType = syncReplicationType;
if (span != null && !CbTracing.isInternalSpan(span)) {
span.lowCardinalityAttribute(TracingIdentifiers.ATTR_OPERATION, TracingIdentifiers.SPAN_REQUEST_KV_DECREMENT);
applyLevelOnSpan(syncReplicationType, span);
}
}
@Override
public ByteBuf encode(ByteBufAllocator alloc, int opaque, KeyValueChannelContext ctx) {
ByteBuf key = null;
ByteBuf extras = null;
ByteBuf flexibleExtras = mutationFlexibleExtras(this, ctx, alloc, syncReplicationType);
try {
key = encodedKeyWithCollection(alloc, ctx);
extras = alloc.buffer((Long.BYTES * 2) + Integer.BYTES);
extras.writeLong(delta);
if (initial.isPresent()) {
extras.writeLong(initial.get());
extras.writeInt((int) expiry);
} else {
extras.writeLong(0); // no initial present, will lead to doc not found
extras.writeInt(IncrementRequest.COUNTER_NOT_EXISTS_EXPIRY);
}
return MemcacheProtocol.flexibleRequest(alloc, MemcacheProtocol.Opcode.DECREMENT, noDatatype(),
partition(), opaque, noCas(), flexibleExtras, extras, key, noBody());
} finally {
ReferenceCountUtil.release(key);
ReferenceCountUtil.release(extras);
ReferenceCountUtil.release(flexibleExtras);
}
}
@Override
public DecrementResponse decode(ByteBuf response, KeyValueChannelContext ctx) {
return new DecrementResponse(
decodeStatus(response),
body(response).map(ByteBuf::readLong).orElse(0L),
cas(response),
extractToken(ctx.mutationTokensEnabled(), partition(), response, ctx.bucket().get())
);
}
@Override
public Optional durabilityLevel() {
return syncReplicationType;
}
@Override
public String name() {
return "decrement";
}
}