| /** |
| * 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.distributedlog; |
| |
| import org.apache.distributedlog.exceptions.OverCapacityException; |
| import org.apache.distributedlog.common.util.PermitLimiter; |
| |
| class WriteLimiter { |
| |
| String streamName; |
| final PermitLimiter streamLimiter; |
| final PermitLimiter globalLimiter; |
| |
| public WriteLimiter(String streamName, PermitLimiter streamLimiter, PermitLimiter globalLimiter) { |
| this.streamName = streamName; |
| this.streamLimiter = streamLimiter; |
| this.globalLimiter = globalLimiter; |
| } |
| |
| public void acquire() throws OverCapacityException { |
| if (!streamLimiter.acquire()) { |
| throw new OverCapacityException(String.format("Stream write capacity exceeded for stream %s", streamName)); |
| } |
| try { |
| if (!globalLimiter.acquire()) { |
| throw new OverCapacityException("Global write capacity exceeded"); |
| } |
| } catch (OverCapacityException ex) { |
| streamLimiter.release(1); |
| throw ex; |
| } |
| } |
| |
| public void release() { |
| release(1); |
| } |
| |
| public void release(int permits) { |
| streamLimiter.release(permits); |
| globalLimiter.release(permits); |
| } |
| |
| public void close() { |
| streamLimiter.close(); |
| globalLimiter.close(); |
| } |
| } |