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/*
* Copyright 2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef GRPC_CORE_LIB_SLICE_SLICE_HASH_TABLE_H
#define GRPC_CORE_LIB_SLICE_SLICE_HASH_TABLE_H
#include "src/core/lib/transport/metadata.h"
/** Hash table implementation.
*
* This implementation uses open addressing
* (https://en.wikipedia.org/wiki/Open_addressing) with quadratic
* probing (https://en.wikipedia.org/wiki/Quadratic_probing).
*
* The keys are \a grpc_slice objects. The values are arbitrary pointers
* with a common vtable.
*
* Hash tables are intentionally immutable, to avoid the need for locking.
*/
typedef struct grpc_slice_hash_table grpc_slice_hash_table;
typedef struct grpc_slice_hash_table_vtable {
void (*destroy_value)(grpc_exec_ctx *exec_ctx, void *value);
void *(*copy_value)(void *value);
} grpc_slice_hash_table_vtable;
typedef struct grpc_slice_hash_table_entry {
grpc_slice key;
void *value; /* Must not be NULL. */
const grpc_slice_hash_table_vtable *vtable;
} grpc_slice_hash_table_entry;
/** Creates a new hash table of containing \a entries, which is an array
of length \a num_entries.
Creates its own copy of all keys and values from \a entries. */
grpc_slice_hash_table *grpc_slice_hash_table_create(
size_t num_entries, grpc_slice_hash_table_entry *entries);
grpc_slice_hash_table *grpc_slice_hash_table_ref(grpc_slice_hash_table *table);
/** Returns 1 when \a table is destroyed. */
void grpc_slice_hash_table_unref(grpc_exec_ctx *exec_ctx,
grpc_slice_hash_table *table);
/** Returns the value from \a table associated with \a key.
Returns NULL if \a key is not found. */
void *grpc_slice_hash_table_get(const grpc_slice_hash_table *table,
const grpc_slice key);
#endif /* GRPC_CORE_LIB_SLICE_SLICE_HASH_TABLE_H */
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