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HDFS-11546. Federation Router RPC server. Contributed by Jason Kace a…
…nd Inigo Goiri. (cherry picked from commit 8a9cdeb)
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Inigo Goiri
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Oct 7, 2017
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104 changes: 104 additions & 0 deletions
104
...hdfs/src/main/java/org/apache/hadoop/hdfs/server/federation/router/ConnectionContext.java
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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 org.apache.hadoop.hdfs.server.federation.router; | ||
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| import org.apache.hadoop.hdfs.NameNodeProxiesClient.ProxyAndInfo; | ||
| import org.apache.hadoop.hdfs.protocol.ClientProtocol; | ||
| import org.apache.hadoop.ipc.RPC; | ||
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|
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| /** | ||
| * Context to track a connection in a {@link ConnectionPool}. When a client uses | ||
| * a connection, it increments a counter to mark it as active. Once the client | ||
| * is done with the connection, it decreases the counter. It also takes care of | ||
| * closing the connection once is not active. | ||
| */ | ||
| public class ConnectionContext { | ||
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| /** Client for the connection. */ | ||
| private final ProxyAndInfo<ClientProtocol> client; | ||
| /** How many threads are using this connection. */ | ||
| private int numThreads = 0; | ||
| /** If the connection is closed. */ | ||
| private boolean closed = false; | ||
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| public ConnectionContext(ProxyAndInfo<ClientProtocol> connection) { | ||
| this.client = connection; | ||
| } | ||
|
|
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| /** | ||
| * Check if the connection is active. | ||
| * | ||
| * @return True if the connection is active. | ||
| */ | ||
| public synchronized boolean isActive() { | ||
| return this.numThreads > 0; | ||
| } | ||
|
|
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| /** | ||
| * Check if the connection is closed. | ||
| * | ||
| * @return If the connection is closed. | ||
| */ | ||
| public synchronized boolean isClosed() { | ||
| return this.closed; | ||
| } | ||
|
|
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| /** | ||
| * Check if the connection can be used. It checks if the connection is used by | ||
| * another thread or already closed. | ||
| * | ||
| * @return True if the connection can be used. | ||
| */ | ||
| public synchronized boolean isUsable() { | ||
| return !isActive() && !isClosed(); | ||
| } | ||
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| /** | ||
| * Get the connection client. | ||
| * | ||
| * @return Connection client. | ||
| */ | ||
| public synchronized ProxyAndInfo<ClientProtocol> getClient() { | ||
| this.numThreads++; | ||
| return this.client; | ||
| } | ||
|
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| /** | ||
| * Release this connection. If the connection was closed, close the proxy. | ||
| * Otherwise, mark the connection as not used by us anymore. | ||
| */ | ||
| public synchronized void release() { | ||
| if (--this.numThreads == 0 && this.closed) { | ||
| close(); | ||
| } | ||
| } | ||
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| /** | ||
| * We will not use this connection anymore. If it's not being used, we close | ||
| * it. Otherwise, we let release() do it once we are done with it. | ||
| */ | ||
| public synchronized void close() { | ||
| this.closed = true; | ||
| if (this.numThreads == 0) { | ||
| ClientProtocol proxy = this.client.getProxy(); | ||
| // Nobody should be using this anymore so it should close right away | ||
| RPC.stopProxy(proxy); | ||
| } | ||
| } | ||
| } |
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