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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.
*/
package okhttp3.internal.connection
import java.net.Socket
import java.util.concurrent.ConcurrentLinkedQueue
import java.util.concurrent.TimeUnit
import okhttp3.Address
import okhttp3.ConnectionPool
import okhttp3.Route
import okhttp3.internal.assertThreadHoldsLock
import okhttp3.internal.closeQuietly
import okhttp3.internal.concurrent.Task
import okhttp3.internal.concurrent.TaskQueue
import okhttp3.internal.concurrent.TaskRunner
import okhttp3.internal.connection.RealCall.CallReference
import okhttp3.internal.okHttpName
import okhttp3.internal.platform.Platform
class RealConnectionPool(
taskRunner: TaskRunner,
/** The maximum number of idle connections for each address. */
private val maxIdleConnections: Int,
keepAliveDuration: Long,
timeUnit: TimeUnit
) {
private val keepAliveDurationNs: Long = timeUnit.toNanos(keepAliveDuration)
private val cleanupQueue: TaskQueue = taskRunner.newQueue()
private val cleanupTask = object : Task("$okHttpName ConnectionPool") {
override fun runOnce(): Long = cleanup(System.nanoTime())
}
/**
* Holding the lock of the connection being added or removed when mutating this, and check its
* [RealConnection.noNewExchanges] property. This defends against races where a connection is
* simultaneously adopted and removed.
*/
private val connections = ConcurrentLinkedQueue()
init {
// Put a floor on the keep alive duration, otherwise cleanup will spin loop.
require(keepAliveDuration > 0L) { "keepAliveDuration <= 0: $keepAliveDuration" }
}
fun idleConnectionCount(): Int {
return connections.count {
synchronized(it) { it.calls.isEmpty() }
}
}
fun connectionCount(): Int {
return connections.size
}
/**
* Attempts to acquire a recycled connection to [address] for [call]. Returns the connection if it
* was acquired, or null if no connection was acquired. The acquired connection will also be
* assigned to [RealCall.connection].
*
* This confirms the returned connection is healthy before returning it. If this encounters any
* unhealthy connections in its search, this will clean them up.
*
* If [routes] is non-null these are the resolved routes (ie. IP addresses) for the connection.
* This is used to coalesce related domains to the same HTTP/2 connection, such as `square.com`
* and `square.ca`.
*/
fun callAcquirePooledConnection(
doExtensiveHealthChecks: Boolean,
address: Address,
call: RealCall,
routes: List?,
requireMultiplexed: Boolean
): RealConnection? {
for (connection in connections) {
// In the first synchronized block, acquire the connection if it can satisfy this call.
val acquired = synchronized(connection) {
when {
requireMultiplexed && !connection.isMultiplexed -> false
!connection.isEligible(address, routes) -> false
else -> {
call.acquireConnectionNoEvents(connection)
true
}
}
}
if (!acquired) continue
// Confirm the connection is healthy and return it.
if (connection.isHealthy(doExtensiveHealthChecks)) return connection
// In the second synchronized block, release the unhealthy acquired connection. We're also on
// the hook to close this connection if it's no longer in use.
val toClose: Socket? = synchronized(connection) {
connection.noNewExchanges = true
call.releaseConnectionNoEvents()
}
toClose?.closeQuietly()
}
return null
}
fun put(connection: RealConnection) {
connection.assertThreadHoldsLock()
connections.add(connection)
cleanupQueue.schedule(cleanupTask)
}
/**
* Notify this pool that [connection] has become idle. Returns true if the connection has been
* removed from the pool and should be closed.
*/
fun connectionBecameIdle(connection: RealConnection): Boolean {
connection.assertThreadHoldsLock()
return if (connection.noNewExchanges || maxIdleConnections == 0) {
connection.noNewExchanges = true
connections.remove(connection)
if (connections.isEmpty()) cleanupQueue.cancelAll()
true
} else {
cleanupQueue.schedule(cleanupTask)
false
}
}
fun evictAll() {
val i = connections.iterator()
while (i.hasNext()) {
val connection = i.next()
val socketToClose = synchronized(connection) {
if (connection.calls.isEmpty()) {
i.remove()
connection.noNewExchanges = true
return@synchronized connection.socket()
} else {
return@synchronized null
}
}
socketToClose?.closeQuietly()
}
if (connections.isEmpty()) cleanupQueue.cancelAll()
}
/**
* Performs maintenance on this pool, evicting the connection that has been idle the longest if
* either it has exceeded the keep alive limit or the idle connections limit.
*
* Returns the duration in nanoseconds to sleep until the next scheduled call to this method.
* Returns -1 if no further cleanups are required.
*/
fun cleanup(now: Long): Long {
var inUseConnectionCount = 0
var idleConnectionCount = 0
var longestIdleConnection: RealConnection? = null
var longestIdleDurationNs = Long.MIN_VALUE
// Find either a connection to evict, or the time that the next eviction is due.
for (connection in connections) {
synchronized(connection) {
// If the connection is in use, keep searching.
if (pruneAndGetAllocationCount(connection, now) > 0) {
inUseConnectionCount++
} else {
idleConnectionCount++
// If the connection is ready to be evicted, we're done.
val idleDurationNs = now - connection.idleAtNs
if (idleDurationNs > longestIdleDurationNs) {
longestIdleDurationNs = idleDurationNs
longestIdleConnection = connection
} else Unit
}
}
}
when {
longestIdleDurationNs >= this.keepAliveDurationNs
|| idleConnectionCount > this.maxIdleConnections -> {
// We've chosen a connection to evict. Confirm it's still okay to be evict, then close it.
val connection = longestIdleConnection!!
synchronized(connection) {
if (connection.calls.isNotEmpty()) return 0L // No longer idle.
if (connection.idleAtNs + longestIdleDurationNs != now) return 0L // No longer oldest.
connection.noNewExchanges = true
connections.remove(longestIdleConnection)
}
connection.socket().closeQuietly()
if (connections.isEmpty()) cleanupQueue.cancelAll()
// Clean up again immediately.
return 0L
}
idleConnectionCount > 0 -> {
// A connection will be ready to evict soon.
return keepAliveDurationNs - longestIdleDurationNs
}
inUseConnectionCount > 0 -> {
// All connections are in use. It'll be at least the keep alive duration 'til we run
// again.
return keepAliveDurationNs
}
else -> {
// No connections, idle or in use.
return -1
}
}
}
/**
* Prunes any leaked calls and then returns the number of remaining live calls on [connection].
* Calls are leaked if the connection is tracking them but the application code has abandoned
* them. Leak detection is imprecise and relies on garbage collection.
*/
private fun pruneAndGetAllocationCount(connection: RealConnection, now: Long): Int {
connection.assertThreadHoldsLock()
val references = connection.calls
var i = 0
while (i < references.size) {
val reference = references[i]
if (reference.get() != null) {
i++
continue
}
// We've discovered a leaked call. This is an application bug.
val callReference = reference as CallReference
val message = "A connection to ${connection.route().address.url} was leaked. " +
"Did you forget to close a response body?"
Platform.get().logCloseableLeak(message, callReference.callStackTrace)
references.removeAt(i)
connection.noNewExchanges = true
// If this was the last allocation, the connection is eligible for immediate eviction.
if (references.isEmpty()) {
connection.idleAtNs = now - keepAliveDurationNs
return 0
}
}
return references.size
}
companion object {
fun get(connectionPool: ConnectionPool): RealConnectionPool = connectionPool.delegate
}
}
