init push

src/storage/ob_pg_meta_checkpoint_writer.cpp

@@ -0,0 +1,79 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PubL v2 for more details.
+ */
+
+#define USING_LOG_PREFIX STORAGE
+
+#include "ob_pg_meta_checkpoint_writer.h"
+
+using namespace oceanbase::common;
+using namespace oceanbase::blocksstable;
+using namespace oceanbase::storage;
+
+ObPGMetaItem::ObPGMetaItem() : buf_(nullptr), buf_len_(0)
+{}
+
+void ObPGMetaItem::set_serialize_buf(const char* buf, const int64_t buf_len)
+{
+  buf_ = buf;
+  buf_len_ = buf_len;
+}
+
+int ObPGMetaItem::serialize(const char*& buf, int64_t& buf_len)
+{
+  int ret = OB_SUCCESS;
+  if (OB_ISNULL(buf_)) {
+    ret = OB_ERR_SYS;
+    LOG_WARN("error sys, buf must not be null", K(ret));
+  } else {
+    buf = buf_;
+    buf_len = buf_len_;
+  }
+  return ret;
+}
+
+ObPGMetaCheckpointWriter::ObPGMetaCheckpointWriter() : is_inited_(false), writer_(nullptr), pg_meta_()
+{}
+
+int ObPGMetaCheckpointWriter::init(ObPGMetaItem& pg_meta, ObPGMetaItemWriter& writer)
+{
+  int ret = OB_SUCCESS;
+  if (OB_UNLIKELY(is_inited_)) {
+    ret = OB_INIT_TWICE;
+    LOG_WARN("ObPGMetaCheckpointWriter has already been inited", K(ret));
+  } else if (OB_UNLIKELY(!pg_meta.is_valid())) {
+    ret = OB_INVALID_ARGUMENT;
+    LOG_WARN("invalid arguments", K(ret), K(pg_meta));
+  } else {
+    pg_meta_ = pg_meta;
+    writer_ = &writer;
+    is_inited_ = true;
+  }
+  return ret;
+}
+
+int ObPGMetaCheckpointWriter::write_checkpoint()
+{
+  int ret = OB_SUCCESS;
+  if (OB_UNLIKELY(!is_inited_)) {
+    ret = OB_NOT_INIT;
+    LOG_WARN("ObPGMetaCheckpointWriter has not been inited", K(ret));
+  } else if (OB_FAIL(writer_->write_item(&pg_meta_))) {
+    LOG_WARN("fail to write pg meta", K(ret));
+  }
+  return ret;
+}
+
+void ObPGMetaCheckpointWriter::reset()
+{
+  is_inited_ = false;
+  writer_ = nullptr;
+}