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// 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.
use std::collections::HashMap;
use std::convert::Into;
use std::sync::{Arc, Mutex};
use {ApplicationErrorKind, new_application_error};
use protocol::{TInputProtocol, TMessageIdentifier, TOutputProtocol, TStoredInputProtocol};
use super::TProcessor;
/// A `TProcessor` that can demux service calls to multiple underlying
/// Thrift services.
///
/// Users register service-specific `TProcessor` instances with a
/// `TMultiplexedProcessor`, and then register that processor with a server
/// implementation. Following that, all incoming service calls are automatically
/// routed to the service-specific `TProcessor`.
///
/// A `TMultiplexedProcessor` can only handle messages sent by a
/// `TMultiplexedOutputProtocol`.
// FIXME: implement Debug
pub struct TMultiplexedProcessor {
processors: Mutex<HashMap<String, Arc<Box<TProcessor>>>>,
}
impl TMultiplexedProcessor {
/// Register a service-specific `processor` for the service named
/// `service_name`.
///
/// Return `true` if this is the first registration for `service_name`.
///
/// Return `false` if a mapping previously existed (the previous mapping is
/// *not* overwritten).
#[cfg_attr(feature = "cargo-clippy", allow(map_entry))]
pub fn register_processor<S: Into<String>>(
&mut self,
service_name: S,
processor: Box<TProcessor>,
) -> bool {
let mut processors = self.processors.lock().unwrap();
let name = service_name.into();
if processors.contains_key(&name) {
false
} else {
processors.insert(name, Arc::new(processor));
true
}
}
}
impl TProcessor for TMultiplexedProcessor {
fn process(&self, i_prot: &mut TInputProtocol, o_prot: &mut TOutputProtocol) -> ::Result<()> {
let msg_ident = i_prot.read_message_begin()?;
let sep_index = msg_ident
.name
.find(':')
.ok_or_else(
|| {
new_application_error(
ApplicationErrorKind::Unknown,
"no service separator found in incoming message",
)
},
)?;
let (svc_name, svc_call) = msg_ident.name.split_at(sep_index);
let processor: Option<Arc<Box<TProcessor>>> = {
let processors = self.processors.lock().unwrap();
processors.get(svc_name).cloned()
};
match processor {
Some(arc) => {
let new_msg_ident = TMessageIdentifier::new(
svc_call,
msg_ident.message_type,
msg_ident.sequence_number,
);
let mut proxy_i_prot = TStoredInputProtocol::new(i_prot, new_msg_ident);
(*arc).process(&mut proxy_i_prot, o_prot)
}
None => {
Err(
new_application_error(
ApplicationErrorKind::Unknown,
format!("no processor found for service {}", svc_name),
),
)
}
}
}
}
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