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// Copyright (c) 2013 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 "content/browser/streams/stream_registry.h"
#include "content/browser/streams/stream.h"
namespace content {
namespace {
// The maximum size of memory each StreamRegistry instance is allowed to use
// for its Stream instances.
const size_t kDefaultMaxMemoryUsage = 1024 * 1024 * 1024U; // 1GiB
}
StreamRegistry::StreamRegistry()
: total_memory_usage_(0),
max_memory_usage_(kDefaultMaxMemoryUsage) {
}
StreamRegistry::~StreamRegistry() {
}
void StreamRegistry::RegisterStream(scoped_refptr<Stream> stream) {
DCHECK(CalledOnValidThread());
DCHECK(stream.get());
DCHECK(!stream->url().is_empty());
streams_[stream->url()] = stream;
}
scoped_refptr<Stream> StreamRegistry::GetStream(const GURL& url) {
DCHECK(CalledOnValidThread());
StreamMap::const_iterator stream = streams_.find(url);
if (stream != streams_.end())
return stream->second;
return NULL;
}
bool StreamRegistry::CloneStream(const GURL& url, const GURL& src_url) {
DCHECK(CalledOnValidThread());
scoped_refptr<Stream> stream(GetStream(src_url));
if (stream.get()) {
streams_[url] = stream;
return true;
}
return false;
}
void StreamRegistry::UnregisterStream(const GURL& url) {
DCHECK(CalledOnValidThread());
StreamMap::iterator iter = streams_.find(url);
if (iter == streams_.end())
return;
// Only update |total_memory_usage_| if |url| is NOT a Stream clone because
// cloned streams do not update |total_memory_usage_|.
if (iter->second->url() == url) {
size_t buffered_bytes = iter->second->last_total_buffered_bytes();
DCHECK_LE(buffered_bytes, total_memory_usage_);
total_memory_usage_ -= buffered_bytes;
}
streams_.erase(url);
}
bool StreamRegistry::UpdateMemoryUsage(const GURL& url,
size_t current_size,
size_t increase) {
DCHECK(CalledOnValidThread());
StreamMap::iterator iter = streams_.find(url);
// A Stream must be registered with its parent registry to get memory.
if (iter == streams_.end())
return false;
size_t last_size = iter->second->last_total_buffered_bytes();
DCHECK_LE(last_size, total_memory_usage_);
size_t usage_of_others = total_memory_usage_ - last_size;
DCHECK_LE(current_size, last_size);
size_t current_total_memory_usage = usage_of_others + current_size;
if (increase > max_memory_usage_ - current_total_memory_usage)
return false;
total_memory_usage_ = current_total_memory_usage + increase;
return true;
}
} // namespace content
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