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// Copyright (c) 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/http_pipelined_host_pool.h"
#include "base/logging.h"
#include "base/stl_util.h"
#include "net/http/http_pipelined_host_impl.h"
namespace net {
// TODO(simonjam): Run experiments with different values of this to see what
// value is good at avoiding evictions without eating too much memory. Until
// then, this is just a bad guess.
static const int kNumHostsToRemember = 200;
class HttpPipelinedHostImplFactory : public HttpPipelinedHost::Factory {
public:
virtual HttpPipelinedHost* CreateNewHost(
HttpPipelinedHost::Delegate* delegate, const HostPortPair& origin,
HttpPipelinedConnection::Factory* factory,
HttpPipelinedHost::Capability capability) OVERRIDE {
return new HttpPipelinedHostImpl(delegate, origin, factory, capability);
}
};
HttpPipelinedHostPool::HttpPipelinedHostPool(
Delegate* delegate,
HttpPipelinedHost::Factory* factory)
: delegate_(delegate),
factory_(factory),
known_capability_map_(kNumHostsToRemember) {
if (!factory) {
factory_.reset(new HttpPipelinedHostImplFactory);
}
}
HttpPipelinedHostPool::~HttpPipelinedHostPool() {
CHECK(host_map_.empty());
}
bool HttpPipelinedHostPool::IsHostEligibleForPipelining(
const HostPortPair& origin) {
HttpPipelinedHost::Capability capability = GetHostCapability(origin);
return capability != HttpPipelinedHost::INCAPABLE;
}
HttpPipelinedStream* HttpPipelinedHostPool::CreateStreamOnNewPipeline(
const HostPortPair& origin,
ClientSocketHandle* connection,
const SSLConfig& used_ssl_config,
const ProxyInfo& used_proxy_info,
const BoundNetLog& net_log,
bool was_npn_negotiated) {
HttpPipelinedHost* host = GetPipelinedHost(origin, true);
if (!host) {
return NULL;
}
return host->CreateStreamOnNewPipeline(connection, used_ssl_config,
used_proxy_info, net_log,
was_npn_negotiated);
}
HttpPipelinedStream* HttpPipelinedHostPool::CreateStreamOnExistingPipeline(
const HostPortPair& origin) {
HttpPipelinedHost* host = GetPipelinedHost(origin, false);
if (!host) {
return NULL;
}
return host->CreateStreamOnExistingPipeline();
}
bool HttpPipelinedHostPool::IsExistingPipelineAvailableForOrigin(
const HostPortPair& origin) {
HttpPipelinedHost* host = GetPipelinedHost(origin, false);
if (!host) {
return false;
}
return host->IsExistingPipelineAvailable();
}
HttpPipelinedHost* HttpPipelinedHostPool::GetPipelinedHost(
const HostPortPair& origin, bool create_if_not_found) {
HostMap::iterator host_it = host_map_.find(origin);
if (host_it != host_map_.end()) {
CHECK(host_it->second);
return host_it->second;
} else if (!create_if_not_found) {
return NULL;
}
HttpPipelinedHost::Capability capability = GetHostCapability(origin);
if (capability == HttpPipelinedHost::INCAPABLE) {
return NULL;
}
HttpPipelinedHost* host = factory_->CreateNewHost(
this, origin, NULL, capability);
host_map_[origin] = host;
return host;
}
void HttpPipelinedHostPool::OnHostIdle(HttpPipelinedHost* host) {
const HostPortPair& origin = host->origin();
CHECK(ContainsKey(host_map_, origin));
host_map_.erase(origin);
delete host;
}
void HttpPipelinedHostPool::OnHostHasAdditionalCapacity(
HttpPipelinedHost* host) {
delegate_->OnHttpPipelinedHostHasAdditionalCapacity(host->origin());
}
void HttpPipelinedHostPool::OnHostDeterminedCapability(
HttpPipelinedHost* host,
HttpPipelinedHost::Capability capability) {
CapabilityMap::iterator known_it = known_capability_map_.Get(host->origin());
if (known_it == known_capability_map_.end() ||
known_it->second != HttpPipelinedHost::INCAPABLE) {
known_capability_map_.Put(host->origin(), capability);
}
}
HttpPipelinedHost::Capability HttpPipelinedHostPool::GetHostCapability(
const HostPortPair& origin) {
HttpPipelinedHost::Capability capability = HttpPipelinedHost::UNKNOWN;
CapabilityMap::const_iterator it = known_capability_map_.Get(origin);
if (it != known_capability_map_.end()) {
capability = it->second;
}
return capability;
}
} // namespace net
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