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Library providing APIs to talk to Android devices
/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed 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 com.android.ddmlib.utils;
import com.android.annotations.concurrency.GuardedBy;
import java.util.ArrayList;
import java.util.List;
public class DebuggerPorts {
@GuardedBy("mDebuggerPorts")
private final List mDebuggerPorts = new ArrayList();
public DebuggerPorts(int basePort) {
mDebuggerPorts.add(basePort);
}
public int next() {
// get the first port and remove it
synchronized (mDebuggerPorts) {
if (!mDebuggerPorts.isEmpty()) {
int port = mDebuggerPorts.get(0);
// remove it.
mDebuggerPorts.remove(0);
// if there's nothing left, add the next port to the list
if (mDebuggerPorts.isEmpty()) {
mDebuggerPorts.add(port+1);
}
return port;
}
}
return -1;
}
public void free(int port) {
if (port <= 0) {
return;
}
synchronized (mDebuggerPorts) {
// because there could be case where clients are closed twice, we have to make
// sure the port number is not already in the list.
if (mDebuggerPorts.indexOf(port) == -1) {
// add the port to the list while keeping it sorted. It's not like there's
// going to be tons of objects so we do it linearly.
int count = mDebuggerPorts.size();
for (int i = 0; i < count; i++) {
if (port < mDebuggerPorts.get(i)) {
mDebuggerPorts.add(i, port);
break;
}
}
// TODO: check if we can compact the end of the list.
}
}
}
}