75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
// Licensed to the Apache Software Foundation (ASF) under one
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// or more contributor license agreements. See the NOTICE file
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// distributed with this work for additional information
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// regarding copyright ownership. The ASF licenses this file
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// to you under the Apache License, Version 2.0 (the
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// "License"); you may not use this file except in compliance
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// with the License. You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing,
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// software distributed under the License is distributed on an
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// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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// KIND, either express or implied. See the License for the
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// specific language governing permissions and limitations
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// under the License.
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#pragma once
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#include <time.h>
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#include <map>
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#include <memory>
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#include <mutex>
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#include <string>
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#include <thread>
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#include <utility>
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#include "common/status.h"
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#include "gen_cpp/Types_types.h"
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#include "gutil/ref_counted.h"
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#include "runtime/exec_env.h"
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#include "util/countdown_latch.h"
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#include "util/thread.h"
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namespace doris {
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struct ScanContext {
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public:
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TUniqueId fragment_instance_id;
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int64_t offset;
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// use this access_time to clean zombie context
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time_t last_access_time;
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std::mutex _local_lock;
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std::string context_id;
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short keep_alive_min;
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ScanContext(std::string id) : context_id(std::move(id)) {}
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ScanContext(const TUniqueId& fragment_id, int64_t offset)
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: fragment_instance_id(fragment_id), offset(offset) {}
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};
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class ExternalScanContextMgr {
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public:
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ExternalScanContextMgr(ExecEnv* exec_env);
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~ExternalScanContextMgr();
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Status create_scan_context(std::shared_ptr<ScanContext>* p_context);
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Status get_scan_context(const std::string& context_id, std::shared_ptr<ScanContext>* p_context);
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Status clear_scan_context(const std::string& context_id);
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private:
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ExecEnv* _exec_env;
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std::map<std::string, std::shared_ptr<ScanContext>> _active_contexts;
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void gc_expired_context();
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CountDownLatch _stop_background_threads_latch;
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scoped_refptr<Thread> _keep_alive_reaper;
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std::mutex _lock;
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};
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} // namespace doris
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