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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.RequestSpan;
import com.couchbase.client.core.cnc.TracingIdentifiers;
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.msg.ResponseStatus;
import com.couchbase.client.core.retry.RetryStrategy;
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.util.Bytes;
import java.time.Duration;
import static com.couchbase.client.core.io.netty.kv.MemcacheProtocol.*;
/**
* Represents a KV GetAndTouch operation.
*
* @since 2.0.0
*/
public class GetAndLockRequest extends BaseKeyValueRequest {
private final Duration lockFor;
public GetAndLockRequest(final String key, final Duration timeout, final CoreContext ctx,
final CollectionIdentifier collectionIdentifier, final RetryStrategy retryStrategy,
final Duration lockFor, final RequestSpan span) {
super(timeout, ctx, retryStrategy, key, collectionIdentifier, span);
this.lockFor = lockFor;
if (span != null) {
span.attribute(TracingIdentifiers.ATTR_OPERATION, TracingIdentifiers.SPAN_REQUEST_KV_GET_AND_LOCK);
}
}
@Override
public ByteBuf encode(ByteBufAllocator alloc, int opaque, KeyValueChannelContext ctx) {
ByteBuf key = null;
ByteBuf extras = null;
try {
key = encodedKeyWithCollection(alloc, ctx);
extras = alloc.buffer(Integer.BYTES).writeInt((int) lockFor.getSeconds());
return MemcacheProtocol.request(alloc, Opcode.GET_AND_LOCK, noDatatype(),
partition(), opaque, noCas(), extras, key, noBody());
} finally {
ReferenceCountUtil.release(key);
ReferenceCountUtil.release(extras);
}
}
@Override
public GetAndLockResponse decode(final ByteBuf response, KeyValueChannelContext ctx) {
ResponseStatus status = decodeStatus(response);
long cas = cas(response);
if (status.success()) {
byte[] bytes = bodyAsBytes(response);
byte[] content = bytes != null ? tryDecompression(bytes, datatype(response)) : Bytes.EMPTY_BYTE_ARRAY;
int flags = extrasAsInt(response, 0, 0);
return new GetAndLockResponse(status, content, cas, flags);
} else {
return new GetAndLockResponse(status, null, cas, 0);
}
}
@Override
public String name() {
return "get_and_lock";
}
}