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constellation: Use FnvHashMap for hashmaps that use ids as keys (#39106)

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FNV is faster for hashing less than 16 bytes of data and the
cryptographic properties of the default HashMap are not needed for the
various ids.

Testing: This does not change functionality.

Signed-off-by: Narfinger <Narfinger@users.noreply.github.com>
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Narfinger 2025-09-03 20:15:19 +02:00 • committed by GitHub
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commit 5c7ea4bdee
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19 changed files with 71 additions and 54 deletions
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components/constellation/broadcastchannel.rs
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@ -6,6 +6,7 @@ use std::collections::HashMap;
use base::id::BroadcastChannelRouterId;
use constellation_traits::BroadcastChannelMsg;
use fnv::FnvHashMap;
use ipc_channel::ipc::IpcSender;
use log::warn;
use servo_url::ImmutableOrigin;
@ -13,7 +14,7 @@ use servo_url::ImmutableOrigin;
#[derive(Default)]
pub(crate) struct BroadcastChannels {
/// A map of broadcast routers to their IPC sender.
routers: HashMap<BroadcastChannelRouterId, IpcSender<BroadcastChannelMsg>>,
routers: FnvHashMap<BroadcastChannelRouterId, IpcSender<BroadcastChannelMsg>>,
/// A map of origin to a map of channel name to a list of relevant routers.
channels: HashMap<ImmutableOrigin, HashMap<String, Vec<BroadcastChannelRouterId>>>,