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The official Couchbase JVM Core IO Library
/*
* Copyright (c) 2019 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.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.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 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.extrasAsInt;
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;
/**
* Represents a kv get meta operation.
*
* @since 2.0.0
*/
public class GetMetaRequest extends BaseKeyValueRequest {
public GetMetaRequest(final String key, final Duration timeout, final CoreContext ctx,
final CollectionIdentifier collectionIdentifier, final RetryStrategy retryStrategy, final RequestSpan span) {
super(timeout, ctx, retryStrategy, key, collectionIdentifier, span);
if (span != null) {
span.lowCardinalityAttribute(TracingIdentifiers.ATTR_OPERATION, TracingIdentifiers.SPAN_REQUEST_KV_EXISTS);
}
}
@Override
public ByteBuf encode(ByteBufAllocator alloc, int opaque, KeyValueChannelContext ctx) {
ByteBuf key = null;
ByteBuf extras = null;
try {
extras = alloc.buffer(Byte.BYTES);
extras.writeByte(2);
key = encodedKeyWithCollection(alloc, ctx);
return MemcacheProtocol.request(alloc, MemcacheProtocol.Opcode.GET_META, noDatatype(),
partition(), opaque, noCas(), extras, key, noBody());
} finally {
ReferenceCountUtil.release(key);
ReferenceCountUtil.release(extras);
}
}
@Override
public GetMetaResponse decode(final ByteBuf response, KeyValueChannelContext ctx) {
boolean deleted = extrasAsInt(response, 0, 0) != 0;
return new GetMetaResponse(decodeStatus(response), cas(response), deleted);
}
@Override
public boolean idempotent() {
return true;
}
@Override
public String name() {
return "exists";
}
}