levy5307 commented on a change in pull request #757:
URL: https://github.com/apache/incubator-pegasus/pull/757#discussion_r654117325
##########
File path: src/server/rocksdb_wrapper.cpp
##########
@@ -119,8 +121,8 @@ int rocksdb_wrapper::write_batch_put_ctx(const
db_write_context &ctx,
rocksdb::Slice skey = utils::to_rocksdb_slice(raw_key);
rocksdb::SliceParts skey_parts(&skey, 1);
- rocksdb::SliceParts svalue = _value_generator->generate_value(
- _pegasus_data_version, value, db_expire_ts(expire_sec), new_timetag);
+ rocksdb::SliceParts svalue =
+ _value_generator->generate_value(value, db_expire_ts(expire_sec),
new_timetag);
Review comment:
I don't want to change the interface in value_generator in this pull
request
##########
File path: src/base/value_generator.cpp
##########
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+#include "value_generator.h"
+#include "value_schema_manager.h"
+#include <dsn/utility/smart_pointers.h>
+
+namespace pegasus {
+/// A higher level utility for generating value with given version.
+rocksdb::SliceParts
+value_generator::generate_value(dsn::string_view user_data, uint32_t
expire_ts, uint64_t timetag)
+{
+ value_params params(_write_buf, _write_slices);
Review comment:
It is used by value_schema::generate_value
##########
File path: src/base/value_generator.cpp
##########
@@ -0,0 +1,38 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+#include "value_generator.h"
+#include "value_schema_manager.h"
+#include <dsn/utility/smart_pointers.h>
+
+namespace pegasus {
+/// A higher level utility for generating value with given version.
+rocksdb::SliceParts
+value_generator::generate_value(dsn::string_view user_data, uint32_t
expire_ts, uint64_t timetag)
+{
+ value_params params(_write_buf, _write_slices);
+ params.fields[value_field_type::EXPIRE_TIMESTAMP] =
+ dsn::make_unique<expire_timestamp_field>(expire_ts);
+ params.fields[value_field_type::TIME_TAG] =
dsn::make_unique<time_tag_field>(timetag);
+ params.fields[value_field_type::USER_DATA] =
dsn::make_unique<user_data_field>(user_data);
+
+ auto schema = value_schema_manager::instance().get_latest_value_schema();
Review comment:
We don't want to generate old value if a new version is developped
##########
File path: src/base/value_generator.h
##########
@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ */
+
+#pragma once
+
+#include <rocksdb/slice.h>
+#include <dsn/utility/string_view.h>
+
+namespace pegasus {
+/**
+ * Helper class for generating value.
+ *
+ * NOTES:
+ * 1. The instance of value_generator must be alive while the returned
SliceParts is.
+ * The data of user_data must be alive while the returned SliceParts is,
because
+ * we do not copy it. And the returned SliceParts is only valid before the
next invoking of
+ * generate_value().
+ * 2. Only the latest version of data is generated in this function, because
we want to make
+ * data with older version disappear gradually.
Review comment:
yes
##########
File path: src/server/rocksdb_wrapper.cpp
##########
@@ -119,8 +121,8 @@ int rocksdb_wrapper::write_batch_put_ctx(const
db_write_context &ctx,
rocksdb::Slice skey = utils::to_rocksdb_slice(raw_key);
rocksdb::SliceParts skey_parts(&skey, 1);
- rocksdb::SliceParts svalue = _value_generator->generate_value(
- _pegasus_data_version, value, db_expire_ts(expire_sec), new_timetag);
+ rocksdb::SliceParts svalue =
+ _value_generator->generate_value(value, db_expire_ts(expire_sec),
new_timetag);
Review comment:
I don't want to change the interface in value_generator in this pull
request. The only thing I want to do is Rewrite the implementation of
value_generator.
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